Magpul PRS Gen3 LOP

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wade2big

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Sep 16, 2017
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#1
Can someone measure the LOP with the stock at it’s shortest? I don’t trust manufacturer listed specs. Measuring from the trigger to the buttpad on a Seekins 10X stock, the LOP is just under 15”. This is ridiculously long.

I am starting to put together a build and will just drop the rifle length receiver extension all together if the PRS Gen3 isn’t any better.
 
#4
They're long. With the carbine tube adapter they measure 11 1/8" from receiver interface to back of pad fully collapsed. Not sure if the rifle tube adapter is different but I assume not.
 
#5
Like Belton earlier, I measured 14 3/8" from the centerline of my JP CTR's Armageddon Roller Trigger to the end of the butt pad. And just like Vodak's measurement, it's 11 1/8" from the leading edge of the tube to the very end of the butt pad. Yes, these are long but the adjustable cheek piece provides a perfect fit for me!
 
#6
Long LOP is the PRS Gen 3's biggest drawback to me, tolerable on a small frame but really long on a large frame. Using the carbine tube adapter won't matter, it's the same length once you install the carbine adapter. I think a couple people have tried cutting down the carbine adapter and they gained about 1/2". If you find a Gen 2 since it has a super thin recoil pad it's about 1/2" shorter. When you consider most rifles come in the 13-13.5" LOP range, and shorter LOP's are becoming more and more popular, the PRS Gen 3 is stupid long even at it's fully compressed length. Their webpage lists 14.3-15.7" LOP and I'd say that's pretty close on a small frame AR, on a large frame receiver you can add almost another 1/2" to that.

There are rumors that the butt pad from the PRS Lite fits on the PRS Gen 3, but I've tried contacting Magpul a couple times since it's release and they have been unwilling to sell me one as a part and have said they have no plans to offer it for sale individually. I'd guess just visually that would gain you 3/8" or so.

There's also the LMT DMR stock (556 and 308 versions), they are basically a PRS Gen 3, but allow for adjustment along a Mil-Spec Carbine tube, and have a wider cheek rest, and of course add about $100 on the price tag.
 
#7
ToddM said:
There's also the LMT DMR stock (556 and 308 versions), they are basically a PRS Gen 3, but allow for adjustment along a Mil-Spec Carbine tube, and have a wider cheek rest, and of course add about $100 on the price tag.
Click to expand...
The RRA Marksman stock is similar but cheaper.
 
#9
I don't know, looks like a 2/3rds scale PRS to my eye. I wouldn't call any of them particularly attractive. Except the B5 Precision stock. That thing is beyond hideous.
 
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#12
TacticalDillhole said:
Every stock with an adjustable cheek riser will have a stupid LOP on an AR10. This is becauasue of the charging handle. there is nothing that can be done about it except finally making side charging frames standard.
Click to expand...
....IIRC the FAB Defense GL series design allows the charging handle to remain operational even when the stock is collapsed as the rest is more "shelf" like and has open space below it...
 
#13
#14
TacticalDillhole said:
Those don’t have an adjustable cheek riser

Edit. Sorry. I was thinking of a different fab gl model. Is this the one you are thinking of?

Click to expand...

...their website showing all models... https://www.fab-defense.co.il/en/category-buttstocks.html

...way back in the dark ages I had one of the original GL series, it worked as advertised as long as the cheek riser was kept in the up position. I seem to recall that if in down position and stock fully collapsed (or partially), the CH could be impeded, but was no problem when stock fully extended. Buffer tube length (carbine -vs- A5) and amount of adjustment holes (5 -vs- 6/7) also were factors...
 
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#15
r.tenorio671 said:
...their website showing all models... https://www.fab-defense.co.il/en/category-buttstocks.html

...way back in the dark ages I had one of the original GL series, it worked as advertised as long as the cheek riser was kept in the up position. I seem to recall that if in down position and stock fully collapsed (or partially), the CH could be impeded, but was no problem when stock fully extended. Buffer tube length (carbine -vs- A5) and amount of adjustment holes (5 -vs- 6/7) also were factors...
Click to expand...
Which is why LOP will always be an issue especially on the large frame AR. The riser will always interfere unless you you have side cut outs where it can have a tunnel so to speak for the charging handle to move under the riser. But then you are dealing with a rear arm and when check pressure placed in riser you have flex issues. The reality is until we make side charging AR’s standard the long LOP will always be there. There is no way to get around it effectively.
 
#16
Just put one on a 6ARC. Sure the hell doesn't need a cantilever mount. Hoping I can make up for the ridiculous pull by just pulling the scope back M - Brace ordered.

Also waiting on a MDT fully adj carbine stock from the BF sale.
 
#17
A Magpul PRS Gen 3 has a length of pull right at 15” in it’s shortest setting on a large frame AR. I decided to pick up a couple to try and ended up selling one NIB and the other like new. I also didn’t like the wide cheek piece. It makes it much harder to get behind the rifle without laying my head over it. It’s also a bit high in it’s lowest setting for a 1.50” mount. Not for me.

The regular Magpul MOE rifle stock is a much better stock in my opinion if using a rifle length receiver extension although it’s LOP is about 14 1/4” when measured inline with the buffer tube which to many will be too long as well. If this is still too long then the rifle length receiver extension has to go.
 
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#18
Yep and these days with JP's captured buffer functioning the same in a carbine buffer I'm not sure there's any advantage to running a rifle length extension anymore on a large frame, especially now that there are some full adjustable carbine stocks out there from Fab, LMT DMR, RRA, MDT, etc.

It's interesting that Magpul is on Gen 3 of the PRS but they still have not addressed the obviously long LOP issue. I suppose as long as they keep selling. In fact they made it worse in the Gen 3 since it maintains the same length even if you use it on a carbine buffer.
 
#22
White_Shark said:
My 10x is about .25 shorter than the Gen 3, Lite is about .25 shorter than procomp

Not huge differences, but still differences that can make them work or not for some people
Click to expand...
Not by my measurements on a large frame. The procomp stock was 15” exactly. The gen 3 prs was maybe a 1/16” of an inch shorter at most. Irrelevant. These were mounted on a rifle length receiver extension on a large frame.

I never measured the magpul prs carbine adapter piece to see if it is shorter than the rifle adapter. It quite possibly is considering your measurements are with a carbine or AR10 length receiver extension considering you are comparing a magpul lite stock that doesn’t mount to a rifle length extension.

Maybe a note on how these stocks are mounted makes the most sense when posting measurements. Large or small frame? Rifle length receiver ext or carbine/a10 length?
 
#23
wade2big said:
Not by my measurements on a large frame. The procomp stock was 15” exactly. The gen 3 prs was maybe a 1/16” of an inch shorter at most. Irrelevant. These were mounted on a rifle length receiver extension on a large frame.

I never measured the magpul prs carbine adapter piece to see if it is shorter than the rifle adapter. It quite possibly is considering your measurements are with a carbine or AR10 length receiver extension considering you are comparing a magpul lite stock that doesn’t mount to a rifle length extension.

Maybe a note on how these stocks are mounted makes the most sense when posting measurements. Large or small frame? Rifle length receiver ext or carbine/a10 length?
Click to expand...
The LOP whether on full length or carbine is identical because charging handle.
 
#24
The PRS G3 is 14-1/2" lop on my small frame to a flat TT shoe.

The fix is to replace it with the LMT DMR stock. With that I've got 12" lop on small frame fully colapsed. At 1 click out on the buffer, the cheek riser clears the large frame charge handle & has 1-3/8" less lop than the PRS G3.

IMG_6891.jpg

IMG_6889.jpg
 
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#25
357Max said:
The PRS G3 is 14-1/2" lop on my small frame to a flat TT shoe.

The fix is to replace it with the LMT DMR stock. With that I've got 12" lop on small frame fully colapsed. At 1 click out on the buffer, the cheek riser clears the large frame charge handle & has 1-3/8" less lop than the PRS G3.

View attachment 7847289
View attachment 7847292
Click to expand...
Did you notice the shorter distance to cheekriser? It is quite substantial. Did you have to max out the LOP setting on the LMT DMR? It still is way better than the PRS.

IMG_6891.jpg
 
#26
ToddM said:
Long LOP is the PRS Gen 3's biggest drawback to me, tolerable on a small frame but really long on a large frame. Using the carbine tube adapter won't matter, it's the same length once you install the carbine adapter. I think a couple people have tried cutting down the carbine adapter and they gained about 1/2". If you find a Gen 2 since it has a super thin recoil pad it's about 1/2" shorter. When you consider most rifles come in the 13-13.5" LOP range, and shorter LOP's are becoming more and more popular, the PRS Gen 3 is stupid long even at it's fully compressed length. Their webpage lists 14.3-15.7" LOP and I'd say that's pretty close on a small frame AR, on a large frame receiver you can add almost another 1/2" to that.

There are rumors that the butt pad from the PRS Lite fits on the PRS Gen 3, but I've tried contacting Magpul a couple times since it's release and they have been unwilling to sell me one as a part and have said they have no plans to offer it for sale individually. I'd guess just visually that would gain you 3/8" or so.

There's also the LMT DMR stock (556 and 308 versions), they are basically a PRS Gen 3, but allow for adjustment along a Mil-Spec Carbine tube, and have a wider cheek rest, and of course add about $100 on the price tag.
Click to expand...
You know that's one thing that really pisses me off with magpul and why I won't buy anything else magpul from here on out. 3 times now I've tried to get a replacement part or piece from magpul and they won't sell it to me. They always say "we don't have a way to sell a part"... Magpul is the only outfit I've ever been told that by and it's their policy clearly. So if ya buy a $1000 stock/chassis and need a piece replaced, you're screwed, you have to buy another stock. That's crazy. I have 3 gen3 stocks and lots of other magpul stuff but I won't be buying anything else magpul since they refuse to help their customers.
 
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#29
Anyone have a spare carbine adapter for the PRS gen 3? I only received the rifle tube adapter and I don't want to replace the entire buffer tube if I don't have to.

Willing to trade/send the rifle adapter I have if anyone needs it.
 
#30
ToddM said:
Long LOP is the PRS Gen 3's biggest drawback to me, tolerable on a small frame but really long on a large frame. Using the carbine tube adapter won't matter, it's the same length once you install the carbine adapter. I think a couple people have tried cutting down the carbine adapter and they gained about 1/2". If you find a Gen 2 since it has a super thin recoil pad it's about 1/2" shorter. When you consider most rifles come in the 13-13.5" LOP range, and shorter LOP's are becoming more and more popular, the PRS Gen 3 is stupid long even at it's fully compressed length. Their webpage lists 14.3-15.7" LOP and I'd say that's pretty close on a small frame AR, on a large frame receiver you can add almost another 1/2" to that.

There are rumors that the butt pad from the PRS Lite fits on the PRS Gen 3, but I've tried contacting Magpul a couple times since it's release and they have been unwilling to sell me one as a part and have said they have no plans to offer it for sale individually. I'd guess just visually that would gain you 3/8" or so.

There's also the LMT DMR stock (556 and 308 versions), they are basically a PRS Gen 3, but allow for adjustment along a Mil-Spec Carbine tube, and have a wider cheek rest, and of course add about $100 on the price tag.
Click to expand...
I ended up buying a few PRS lites on black Friday last year and swapping buttpads with my gen 3s. Sold the PRS lites with the gen 3 butt pads for what I paid for them.

Magpul wouldn't sell me PRS lite butt pads by themselves so I did what I had to to get them 🤣
 

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#33
ToddM said:
Bit of a necrothread but it appears Magpul is now selling the PRS lite pads.
Click to expand...
Good to know , Thank you

All these softer pads, sure make a long day shooting session much more pleasurable.

And FWIW... Kick-Eez sells a 1/2" and 15/16" much softer recoil pad.
https://kickeezproducts.com/collections/pre-fit-shotgun-recoil-pads/products/magpul-prs-recoil-pads

And Limbsaver also sells a MUCH softer , but thick recoil pad.
https://limbsaver.com/products/magpul-prs-gen-3-stock-recoil-pad

And Hoptic sells a ton of different saddle "blankets" ( cheek pads ) for a lot of different firearms and stocks..
https://www.hopticusa.com/product-page/magpul-prs-gen-1-2-3-saddle-blanket
https://www.hopticusa.com/search-results?q=Saddle+Blankets

And Kick-Eez sells cheek rests as well..
https://kickeezproducts.com/magpul-prs-lite-cheek-pad/

FWIW, For the cheek rest pads, I will adhere them as per the instructions, and wrap them with a Self adhering Ace bandage overnight.
 
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#34
The Ace Bandage overnight to set the adhesive is a great idea. I've usually just buy 1/8" thick closed cell foam adhesive sheets and I cut them out myself to fit. A 9x12 2mm thick sheet is only about $1, it's not laser cut or anything, but they seem to stand up as good as the ones they sell for $15. You can also get different thicknesses if you want.
 
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