Need help deciding on one or the other. Here's my scenario: I am building an AR-15, my plan is to use one lower with either magpul's UBR or PRS buttstock. My uppers will consist of a 6.5 Grendel precision rifle with a mid to long range scope, and the other one will be chambered in .223 with a close to mid range optic, and maybe down the road a .22lr for a trainer/plinker that mimics the .223 upper. So my question is, Do you think I need the PRS with the adjustable cheek when shooting the 6.5 grendel with the optic mounted higher enabling a scope to fit with say a 50mm objective? Or will the comb of the UBR be high enoungh?
Magpul PRS or UBR?
- Thread starter bribri
- Start date
Re: Magpul PRS or UBR?
I've just gone thru the same process - my uppers are a .22LR plinker and (in process) a .223 18" 1 in 7 with NXS 2.5-10 x 24 for ranges up to 600m.
I've decided to go with the UBR.
If I was looking to shoot out to longer ranges or for a dedicate "precision" upper....I'd have gone with the PRS simply because fo the additional adjustment/flexibility
I've just gone thru the same process - my uppers are a .22LR plinker and (in process) a .223 18" 1 in 7 with NXS 2.5-10 x 24 for ranges up to 600m.
I've decided to go with the UBR.
If I was looking to shoot out to longer ranges or for a dedicate "precision" upper....I'd have gone with the PRS simply because fo the additional adjustment/flexibility
Re: Magpul PRS or UBR?
I agree with BasraBoy. I just put a PRS on my .308 and I love it, but it is a bit heavier and bulkier. Not much, but a little.([email protected] lbs & PRS@ 1.85 lbs). The UBR is also has more LOP adjustment (UBR has 3.3", PRS only has 1").I think the UBR is the best choice for the gun Youre putting together. But like I said, I love my PRS. With the Accu-Shot BT12-prm monopod, Its solid as a rock!
I also have a AR carbine which I thought about going with a dedicated .22 upper for. I wound up getting the CMMG conversion for $189 and I was surprised at the accuracy. I bought 4 of the Black Dog 25rd. mags, and they feed flawlessly.The good thing about the conversion is I didn't have to set up another upper with a rail system and accesories/optics. If you decide to go that route, I've found CCI Mini-Mags work the best with the kit.
Good luck!
I agree with BasraBoy. I just put a PRS on my .308 and I love it, but it is a bit heavier and bulkier. Not much, but a little.([email protected] lbs & PRS@ 1.85 lbs). The UBR is also has more LOP adjustment (UBR has 3.3", PRS only has 1").I think the UBR is the best choice for the gun Youre putting together. But like I said, I love my PRS. With the Accu-Shot BT12-prm monopod, Its solid as a rock!
I also have a AR carbine which I thought about going with a dedicated .22 upper for. I wound up getting the CMMG conversion for $189 and I was surprised at the accuracy. I bought 4 of the Black Dog 25rd. mags, and they feed flawlessly.The good thing about the conversion is I didn't have to set up another upper with a rail system and accesories/optics. If you decide to go that route, I've found CCI Mini-Mags work the best with the kit.
Good luck!
Re: Magpul PRS or UBR?
I'd have to agree with BasraBoy as well.
I have a 20" 1/8 .223 that's more of a precision rig and use that lower for my new 6.5 Grendel upper. The A2 was fine for .223, but I decided to go with the PRS for ergonomics switching between both. The adjustable cheekpiece and LOP on the PRS made a big difference for me for the better.
I have nothing against the UBR. I thought of purchasing one as well, but more for a carbine/middy type of setup.
I'd have to agree with BasraBoy as well.
I have a 20" 1/8 .223 that's more of a precision rig and use that lower for my new 6.5 Grendel upper. The A2 was fine for .223, but I decided to go with the PRS for ergonomics switching between both. The adjustable cheekpiece and LOP on the PRS made a big difference for me for the better.
I have nothing against the UBR. I thought of purchasing one as well, but more for a carbine/middy type of setup.
Re: Magpul PRS or UBR?
My $.02- the UBR will work for both guns, but the PRS really only works for the longer gun. With a close quartes setup you want a collapsible stock, I think. I would start with the UBR and then later build a 2nd lower for the precision rig. Plus the guys at AR15 would laugh at you if you had an Eotech mounted on a gun with a PRS. Hell, I might even chuckle a bit.
My $.02- the UBR will work for both guns, but the PRS really only works for the longer gun. With a close quartes setup you want a collapsible stock, I think. I would start with the UBR and then later build a 2nd lower for the precision rig. Plus the guys at AR15 would laugh at you if you had an Eotech mounted on a gun with a PRS. Hell, I might even chuckle a bit.
Re: Magpul PRS or UBR?
I own both the PRS and the UBR. The PRS is nearly useless on the AR platform. Due to the clearance needed for the charging handle, the cheek-piece is too far back to be of any real use. It has very little adjustment range, and really only goes from being A2 in length to even longer. Butthook is too far forward and I found that the bottom of the butt extended too far down to properly run a rear bag. (I fixed this by removing the butthook cover and exposing the rail section.) Also, with it being fully flat it's a lot harder to change elevation with the rear bag. One would be much better suited buying a Sierra Precision adjustable buttplate and an A1 stock. Then adjust for LOP and drop(comb height). Foremost, you should choose your optic and ring combo wisely. That way you can achieve the correct cheekweld without having to resort to an adjustable comb. Don't go for overly huge objectives, and use something like an SPR-S mount which is distinctly lower than most unimounts. I also found that shorter eye relief scopes tend to work better and give more mounting solutions. Leupold tends to have way too long of eye relief.
UBR is great. It's more adjustable and has a longer achievable LOP than nearly every other carbine buffer tube adjustable stock out there. Also the comb is fixed in relation to the adjustable portion of the stock. (Better more consistent cheekweld) The mechanism is so solid, that when it's locked up, it feels like a fixed stock. The design is such that no amount of wear will make it loosen up. (Wedge type design.) I have 2 of them and the first is a pre-production model. I think it's probably a couple years old now, yet it still locks up as tight as when I first got it. All my CTR's eventually have loosened up and I bet with the same locking mechanism on the ACS, that will do the same. If one could quickly drop the buttplate on the UBR it would be perfection. As it is, it's just a darn good stock, that's pretty much unparalleled by any other AR stock.
Anyway, here's a pic of one of my setups using the UBR. It works very well. Balance is very good. Weight is a bit much, but it's really handy without the bipod or optic. Also, rear weight has been known to help with rifle control.
I own both the PRS and the UBR. The PRS is nearly useless on the AR platform. Due to the clearance needed for the charging handle, the cheek-piece is too far back to be of any real use. It has very little adjustment range, and really only goes from being A2 in length to even longer. Butthook is too far forward and I found that the bottom of the butt extended too far down to properly run a rear bag. (I fixed this by removing the butthook cover and exposing the rail section.) Also, with it being fully flat it's a lot harder to change elevation with the rear bag. One would be much better suited buying a Sierra Precision adjustable buttplate and an A1 stock. Then adjust for LOP and drop(comb height). Foremost, you should choose your optic and ring combo wisely. That way you can achieve the correct cheekweld without having to resort to an adjustable comb. Don't go for overly huge objectives, and use something like an SPR-S mount which is distinctly lower than most unimounts. I also found that shorter eye relief scopes tend to work better and give more mounting solutions. Leupold tends to have way too long of eye relief.
UBR is great. It's more adjustable and has a longer achievable LOP than nearly every other carbine buffer tube adjustable stock out there. Also the comb is fixed in relation to the adjustable portion of the stock. (Better more consistent cheekweld) The mechanism is so solid, that when it's locked up, it feels like a fixed stock. The design is such that no amount of wear will make it loosen up. (Wedge type design.) I have 2 of them and the first is a pre-production model. I think it's probably a couple years old now, yet it still locks up as tight as when I first got it. All my CTR's eventually have loosened up and I bet with the same locking mechanism on the ACS, that will do the same. If one could quickly drop the buttplate on the UBR it would be perfection. As it is, it's just a darn good stock, that's pretty much unparalleled by any other AR stock.
Anyway, here's a pic of one of my setups using the UBR. It works very well. Balance is very good. Weight is a bit much, but it's really handy without the bipod or optic. Also, rear weight has been known to help with rifle control.
Re: Magpul PRS or UBR?
The PRS is more suited for shooting off a bipod or rest than for shooting standing up. The UBR gives you more flexibility, so I would go with that. If you were shooting a varmint length AR, I would opt for the PRS. For anything shorter, the UBR.
The PRS is more suited for shooting off a bipod or rest than for shooting standing up. The UBR gives you more flexibility, so I would go with that. If you were shooting a varmint length AR, I would opt for the PRS. For anything shorter, the UBR.
Re: Magpul PRS or UBR?
I also vote UBR. The PRS is too heavy and bulky for anything but a dedicated precision rig. Here is my recce build with a UBR.
I also vote UBR. The PRS is too heavy and bulky for anything but a dedicated precision rig. Here is my recce build with a UBR.
Re: Magpul PRS or UBR?
I've never shot NTCH so PRS is a non issue for me. If you shoot NTCH UBR is the better choice as the cheekrest would be useless.
As for the charging handle and the cheekrest...it's a non issue on AR15 platform as the charging handle fully extended is short of the cheekrest by about 1/4 of an inch. For AR10, AR308 etc if you use the AR15 PRS stock...you should have read the instructions as this is addressed with the AR10 designed PRS to give the same clearance for the charging handle.
As you can see there are many opinions and preferences. Your best bet is to try before you buy if it's possible.
I've never shot NTCH so PRS is a non issue for me. If you shoot NTCH UBR is the better choice as the cheekrest would be useless.
As for the charging handle and the cheekrest...it's a non issue on AR15 platform as the charging handle fully extended is short of the cheekrest by about 1/4 of an inch. For AR10, AR308 etc if you use the AR15 PRS stock...you should have read the instructions as this is addressed with the AR10 designed PRS to give the same clearance for the charging handle.
As you can see there are many opinions and preferences. Your best bet is to try before you buy if it's possible.
Re: Magpul PRS or UBR?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Salmonaxe</div><div class="ubbcode-body">I own both the PRS and the UBR. The PRS is nearly useless on the AR platform. Due to the clearance needed for the charging handle, the cheek-piece is too far back to be of any real use. It has very little adjustment range, and really only goes from being A2 in length to even longer. Butthook is too far forward and I found that the bottom of the butt extended too far down to properly run a rear bag. (I fixed this by removing the butthook cover and exposing the rail section.) Also, with it being fully flat it's a lot harder to change elevation with the rear bag. One would be much better suited buying a Sierra Precision adjustable buttplate and an A1 stock. Then adjust for LOP and drop(comb height). Foremost, you should choose your optic and ring combo wisely. That way you can achieve the correct cheekweld without having to resort to an adjustable comb. Don't go for overly huge objectives, and use something like an SPR-S mount which is distinctly lower than most unimounts. I also found that shorter eye relief scopes tend to work better and give more mounting solutions. Leupold tends to have way too long of eye relief.
UBR is great. It's more adjustable and has a longer achievable LOP than nearly every other carbine buffer tube adjustable stock out there. Also the comb is fixed in relation to the adjustable portion of the stock. (Better more consistent cheekweld) The mechanism is so solid, that when it's locked up, it feels like a fixed stock. The design is such that no amount of wear will make it loosen up. (Wedge type design.) I have 2 of them and the first is a pre-production model. I think it's probably a couple years old now, yet it still locks up as tight as when I first got it. All my CTR's eventually have loosened up and I bet with the same locking mechanism on the ACS, that will do the same. If one could quickly drop the buttplate on the UBR it would be perfection. As it is, it's just a darn good stock, that's pretty much unparalleled by any other AR stock.
Anyway, here's a pic of one of my setups using the UBR. It works very well. Balance is very good. Weight is a bit much, but it's really handy without the bipod or optic. Also, rear weight has been known to help with rifle control.
</div></div>
Hey what size is your objective on that scope and which larue mount is that. Nice setup
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Salmonaxe</div><div class="ubbcode-body">I own both the PRS and the UBR. The PRS is nearly useless on the AR platform. Due to the clearance needed for the charging handle, the cheek-piece is too far back to be of any real use. It has very little adjustment range, and really only goes from being A2 in length to even longer. Butthook is too far forward and I found that the bottom of the butt extended too far down to properly run a rear bag. (I fixed this by removing the butthook cover and exposing the rail section.) Also, with it being fully flat it's a lot harder to change elevation with the rear bag. One would be much better suited buying a Sierra Precision adjustable buttplate and an A1 stock. Then adjust for LOP and drop(comb height). Foremost, you should choose your optic and ring combo wisely. That way you can achieve the correct cheekweld without having to resort to an adjustable comb. Don't go for overly huge objectives, and use something like an SPR-S mount which is distinctly lower than most unimounts. I also found that shorter eye relief scopes tend to work better and give more mounting solutions. Leupold tends to have way too long of eye relief.
UBR is great. It's more adjustable and has a longer achievable LOP than nearly every other carbine buffer tube adjustable stock out there. Also the comb is fixed in relation to the adjustable portion of the stock. (Better more consistent cheekweld) The mechanism is so solid, that when it's locked up, it feels like a fixed stock. The design is such that no amount of wear will make it loosen up. (Wedge type design.) I have 2 of them and the first is a pre-production model. I think it's probably a couple years old now, yet it still locks up as tight as when I first got it. All my CTR's eventually have loosened up and I bet with the same locking mechanism on the ACS, that will do the same. If one could quickly drop the buttplate on the UBR it would be perfection. As it is, it's just a darn good stock, that's pretty much unparalleled by any other AR stock.
Anyway, here's a pic of one of my setups using the UBR. It works very well. Balance is very good. Weight is a bit much, but it's really handy without the bipod or optic. Also, rear weight has been known to help with rifle control.
Hey what size is your objective on that scope and which larue mount is that. Nice setup
Re: Magpul PRS or UBR?
Looks like a 50 or 56mm objective with a LT-158, and I agree. Nice setup.
Looks like a 50 or 56mm objective with a LT-158, and I agree. Nice setup.
Re: Magpul PRS or UBR?
They kinda do different things.
Kinda.
I have a PRS on my AR10 and, though not light weight, it is a great stock, fits like a glove.
They kinda do different things.
Kinda.
I have a PRS on my AR10 and, though not light weight, it is a great stock, fits like a glove.
Re: Magpul PRS or UBR?
Don't mean to Hi-jack but if you're interested in saving some weight look at the VLTOR EMOD. Great stock, so is the UBR, almost went that wat too but I needed to save some weight
Don't mean to Hi-jack but if you're interested in saving some weight look at the VLTOR EMOD. Great stock, so is the UBR, almost went that wat too but I needed to save some weight
Re: Magpul PRS or UBR?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bebberson</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Salmonaxe</div><div class="ubbcode-body">I own both the PRS and the UBR. The PRS is nearly useless on the AR platform. Due to the clearance needed for the charging handle, the cheek-piece is too far back to be of any real use. It has very little adjustment range, and really only goes from being A2 in length to even longer. Butthook is too far forward and I found that the bottom of the butt extended too far down to properly run a rear bag. (I fixed this by removing the butthook cover and exposing the rail section.) Also, with it being fully flat it's a lot harder to change elevation with the rear bag. One would be much better suited buying a Sierra Precision adjustable buttplate and an A1 stock. Then adjust for LOP and drop(comb height). Foremost, you should choose your optic and ring combo wisely. That way you can achieve the correct cheekweld without having to resort to an adjustable comb. Don't go for overly huge objectives, and use something like an SPR-S mount which is distinctly lower than most unimounts. I also found that shorter eye relief scopes tend to work better and give more mounting solutions. Leupold tends to have way too long of eye relief.
UBR is great. It's more adjustable and has a longer achievable LOP than nearly every other carbine buffer tube adjustable stock out there. Also the comb is fixed in relation to the adjustable portion of the stock. (Better more consistent cheekweld) The mechanism is so solid, that when it's locked up, it feels like a fixed stock. The design is such that no amount of wear will make it loosen up. (Wedge type design.) I have 2 of them and the first is a pre-production model. I think it's probably a couple years old now, yet it still locks up as tight as when I first got it. All my CTR's eventually have loosened up and I bet with the same locking mechanism on the ACS, that will do the same. If one could quickly drop the buttplate on the UBR it would be perfection. As it is, it's just a darn good stock, that's pretty much unparalleled by any other AR stock.
Anyway, here's a pic of one of my setups using the UBR. It works very well. Balance is very good. Weight is a bit much, but it's really handy without the bipod or optic. Also, rear weight has been known to help with rifle control.
</div></div>
Hey what size is your objective on that scope and which larue mount is that. Nice setup </div></div>
It's 44mm objective USO with Ergo parallax, but that tends to run a bit large compared to most scope objectives. Mount is a SPR-S Larue Tactical LT-158. It has 10MOA of forward cant and is a bit lower than their other mounts. If I remember correctly I was able to use both a 50mm objective Ziess Conquest and a 50mm Leupold Mark 4 in the same mount.
I'm dying to get my Ops Inc 12th. It's been a month since they cashed my check, so I'm still looking at a long wait.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bebberson</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Salmonaxe</div><div class="ubbcode-body">I own both the PRS and the UBR. The PRS is nearly useless on the AR platform. Due to the clearance needed for the charging handle, the cheek-piece is too far back to be of any real use. It has very little adjustment range, and really only goes from being A2 in length to even longer. Butthook is too far forward and I found that the bottom of the butt extended too far down to properly run a rear bag. (I fixed this by removing the butthook cover and exposing the rail section.) Also, with it being fully flat it's a lot harder to change elevation with the rear bag. One would be much better suited buying a Sierra Precision adjustable buttplate and an A1 stock. Then adjust for LOP and drop(comb height). Foremost, you should choose your optic and ring combo wisely. That way you can achieve the correct cheekweld without having to resort to an adjustable comb. Don't go for overly huge objectives, and use something like an SPR-S mount which is distinctly lower than most unimounts. I also found that shorter eye relief scopes tend to work better and give more mounting solutions. Leupold tends to have way too long of eye relief.
UBR is great. It's more adjustable and has a longer achievable LOP than nearly every other carbine buffer tube adjustable stock out there. Also the comb is fixed in relation to the adjustable portion of the stock. (Better more consistent cheekweld) The mechanism is so solid, that when it's locked up, it feels like a fixed stock. The design is such that no amount of wear will make it loosen up. (Wedge type design.) I have 2 of them and the first is a pre-production model. I think it's probably a couple years old now, yet it still locks up as tight as when I first got it. All my CTR's eventually have loosened up and I bet with the same locking mechanism on the ACS, that will do the same. If one could quickly drop the buttplate on the UBR it would be perfection. As it is, it's just a darn good stock, that's pretty much unparalleled by any other AR stock.
Anyway, here's a pic of one of my setups using the UBR. It works very well. Balance is very good. Weight is a bit much, but it's really handy without the bipod or optic. Also, rear weight has been known to help with rifle control.
Hey what size is your objective on that scope and which larue mount is that. Nice setup </div></div>
It's 44mm objective USO with Ergo parallax, but that tends to run a bit large compared to most scope objectives. Mount is a SPR-S Larue Tactical LT-158. It has 10MOA of forward cant and is a bit lower than their other mounts. If I remember correctly I was able to use both a 50mm objective Ziess Conquest and a 50mm Leupold Mark 4 in the same mount.
I'm dying to get my Ops Inc 12th. It's been a month since they cashed my check, so I'm still looking at a long wait.
Re: Magpul PRS or UBR?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bebberson</div><div class="ubbcode-body">thanks for the replies I think I will go with the UBR</div></div>
good decision!
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bebberson</div><div class="ubbcode-body">thanks for the replies I think I will go with the UBR</div></div>
good decision!
Re: Magpul PRS or UBR?
I had a UBR on my 18" SPR clone, but it now has a PRS. Like others have said, it depends on intended use. I switched out because I shoot from a front rest and rear bag a lot. The UBR is almost useless if you ever use a rear sandbag, but is better if you want a more "mobile" gun. The UBR is also better for carbines, and will balance the gun nicely if you have a heavy barrel or a suppressor.
At its shortest, the PRS is actually closer to the A1 buttstock in length. I also have a lower with an A2 stock and the PRS is shorter than that, even with the buttplate extended a little bit.
I had a UBR on my 18" SPR clone, but it now has a PRS. Like others have said, it depends on intended use. I switched out because I shoot from a front rest and rear bag a lot. The UBR is almost useless if you ever use a rear sandbag, but is better if you want a more "mobile" gun. The UBR is also better for carbines, and will balance the gun nicely if you have a heavy barrel or a suppressor.
At its shortest, the PRS is actually closer to the A1 buttstock in length. I also have a lower with an A2 stock and the PRS is shorter than that, even with the buttplate extended a little bit.
Re: Magpul PRS or UBR?
I prefer the UBR. I can use a rear bag fine.
I think the biggest question is if the shooter shoots with their cheekweld more forward or more rearward. I am almost NTCH even prone, so the UBR is better suited for me. They are both heavy stocks.
I prefer the UBR. I can use a rear bag fine.
I think the biggest question is if the shooter shoots with their cheekweld more forward or more rearward. I am almost NTCH even prone, so the UBR is better suited for me. They are both heavy stocks.
