Rifle Scopes Scope riser on a prs rifle? i have an eye relief problem

DanUSMC

DanUSMC

Private
Minuteman
Jul 13, 2018
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50
#1
Evening gents. Im setting up a rifle, picked up a ZCO527 for it and I'm struggling to get proper eye relief. It seems like a lot of guys have the opposite problem from me, I'm 6'4", long neck, long arms, but with the way I interface with the gun I can't get the scope back far enough. I'm setting the gun up for shooting barricade 90% of the time, and I normally use around 14.5" LOP.

Im considering buying a pic rail with an overhang so I could scoot the mount back further. Leupold "mark AR", Scalarworks "fuse/01" and PRI are what I've looked at as possible solutions. I'm a little bit hesitant though because this adds complexity, more machined parts, tolerance stacking, things to come loose smd shift etc. Does anyone have experience using a riser like this on a PRS type gun? Any problems with it? I imagine it'd be fine but it gives me the ick as the kids say. I know too many CNC operators...

Another option is to have a scope base custom made that gives me a few more pic rail slots to the rear but that'll be a PITA.

I've never had this problem before so I'm a bit vexed.
If anyone has suggestions or experience using a riser on a precision gun lmk I'd like to hear your thoughts.
 

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#4
DanUSMC said:
They're 1.5", the ZCO Block Mount. I think the increased HOB will be of benefit as well but my main reason for looking at a riser is moving the occular lense rearward.
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I’ve been looking at adding a riser to one of my rifles but for the increased HOB. I started shifting to higher mounts about 7 years ago but still have a rifle that has a scope mounted a bit lower than what I want. I know that’s not why you want to add a riser but I decided I wanted to try it after watching Frank (owner of this site) talk about adding a riser for increased HOB on his YouTube channel a few months ago. Point is I think it would be ok regardless of the reason but I am no expert.
 
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#5
You could buy a cantilever style mount and face it backwards. Making it opposite cantilever. I’d look on EuroOptic. I have this problem with K525i. It’s the short eyepiece end. Most scopes are longer in the back. Unpopular opinion but you might be better served getting a scope that works better with your physiology.
 
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#6
charnicus said:
You could buy a cantilever style mount and face it backwards. Making it opposite cantilever. I’d look on EuroOptic. I have this problem with K525i. It’s the short eyepiece end. Most scopes are longer in the back. Unpopular opinion but you might be better served getting a scope that works better with your physiology.
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Thats a good idea, if I'm desperate enough I might try it. I know what you mean, I may have to go with different optic I just really want to use this ZCO if i can make it work. I just ordered the leupold riser, $50 bucks, 5 bolts and 3 recoil lugs I'm sure it's going to work fine.
 
#7
DanUSMC said:
Evening gents. Im setting up a rifle, picked up a ZCO527 for it and I'm struggling to get proper eye relief. It seems like a lot of guys have the opposite problem from me, I'm 6'4", long neck, long arms, but with the way I interface with the gun I can't get the scope back far enough. I'm setting the gun up for shooting barricade 90% of the time, and I normally use around 14.5" LOP.

Im considering buying a pic rail with an overhang so I could scoot the mount back further. Leupold "mark AR", Scalarworks "fuse/01" and PRI are what I've looked at as possible solutions. I'm a little bit hesitant though because this adds complexity, more machined parts, tolerance stacking, things to come loose smd shift etc. Does anyone have experience using a riser like this on a PRS type gun? Any problems with it? I imagine it'd be fine but it gives me the ick as the kids say. I know too many CNC operators...

Another option is to have a scope base custom made that gives me a few more pic rail slots to the rear but that'll be a PITA.

I've never had this problem before so I'm a bit vexed.
If anyone has suggestions or experience using a riser on a precision gun lmk I'd like to hear your thoughts.
Click to expand...
Why is your cheekpiece cocked off to the side like that. You really get NPA setup like that?

There are alot of really good tall skinny lanky dudes who shoots PRS and run a pretty normal setup. I would look at that first.
 
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#8
DeathBeforeDismount said:
Why is your cheekpiece cocked off to the side like that. You really get NPA setup like that?

There are alot of really good tall skinny lanky dudes who shoots PRS and run a pretty normal setup. I would look at that first.
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It let's me keep my neck and head neutral, straight up and down, more comfortable. never caused a problem with npa for me. It definitely could be a problem if I'm not consistent but that goes for anything.
Besides the cheek piece it's pretty normal, I just like my lop at 14.5". I have rifles with shorter lop, I can shoot them fine but on this gun I don't want to compromise on my body position/comfort. I picked up a riser I'm gonna try it out and see, probably should have just done it instead of poasting 😆
 
#10
14.5 is REALLY long. Even big guys run a shorter LOP. I'm only 5'8 but run about 12-12.5", which can be too long in some positions. If you listen to guys like Chad, Keith, Francis , ect most of them run shorter LOP and they are all pretty tall (compared to my short ass).

I am not going to make to many assumptions but my guess is you are not shooting squared up with the butt pad in your clavicle. It makes a huge difference in recoil management and NPA.

Alot of guys run 1.5" high mounts with almost no cheekpeace in. Something like this but literally flat against the top of the chassis. https://mdttac.com/us/mdt-low-profile-cheek-piece

Its your money but I would make sure my form and fundamentals are sound before investing in some wonky setup that you may end up trashing if you do clean up your form... assuming that is the issue.

Either way good luck!
 
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#11
I’m 6’5”. I used to run longer LOP to be comfortable for prone/bench shooting but have found shorter LOP is much more comfortable for positional shooting. Example, I started with a krg bravo and was running 5-6 spacers I think, I then pulled all the spacers or maybe had 1 and improved positional shooting significantly.

I have never had an issue getting the proper eye relief but the closest I came to problems was using a MDT mount and it was all the way back. I switched to rings for other reasons and have 0 issues. Would switching to rings fix your problem?

I also run 1.5” high mounts. Would like to go a little higher to get a more vertical head position. Helps finding targets easier and more natural and more comfortable behind the gun. I use my jaw weld as the reference point instead of my cheek.
 
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#12
Yea im aware I've heard Frank mention it as well. Im squared up, stock is in the clavicle. This is actually part of my problem, to get good sight picture Id either have to angle to the gun or crane my neck a bunch. Shorten the lop is easiest cheapest way I agree. If the riser doesn't work out I'll put my atacr back on this one, didn't have issues with that scope.
 
#14
DanUSMC said:
Thats a good idea, if I'm desperate enough I might try it. I know what you mean, I may have to go with different optic I just really want to use this ZCO if i can make it work. I just ordered the leupold riser, $50 bucks, 5 bolts and 3 recoil lugs I'm sure it's going to work fine.
Click to expand...
If your action is 90* throw I don’t think you can extend past the rear of the rail? Raising the scope up will increase the issue you have. The chassis could be an issue for you.
 
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#15
Best thing to do is take a few pics of you set up behind the rifle and from the sides.

Slight positional changes can cause issues

I apparently have high cheek bones. I have almost every cheek piece close to the top with regular height rings. My old TRG I had to make an extra spacer and longer bolt.
 
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#17
brianf said:
Best thing to do is take a few pics of you set up behind the rifle and from the sides.

Slight positional changes can cause issues

I apparently have high cheek bones. I have almost every cheek piece close to the top with regular height rings. My old TRG I had to make an extra spacer and longer bolt.
Click to expand...
what specifically do you look for in the pics?
 
#18
These are two screenshots, one is with an ar10 with a 15" LOP,
other is current rifle with the 14.5" LOP I want but with a NF on it. The nightforce worked for that LOP and is great but it was just a temporary stand in, I hate the horus reticle it has and I can't sell the thing haha. Idk if I'm doing something incredibly wrong, lmk if I am. Maybe I'm all fked up. I love a good roast. I generally find i like my elbow to be at 90°, which is right where 14.5 puts me. Less than that feels cramped and puts strain on my hand/wrist. It's just uncomfortable idk how everyone else does the short lop.
 

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#19
I just measured all my rifles and I’m running 13.5-14” lop at 6’5”

Have you tried shortening your length of pull on your new chassis to get the eye relief you need and then trying positions and see how you like it? Shortening lop an inch isn’t going to significantly change the angle of your arm/hand.

You will feel it but it’s not huge. And the eye relief gains may be worth it.
 
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#20
Baron85 said:
I just measured all my rifles and I’m running 13.5-14” lop at 6’5”

Have you tried shortening your length of pull on your new chassis to get the eye relief you need and then trying positions and see how you like it? Shortening lop an inch isn’t going to significantly change the angle of your arm/hand.

You will feel it but it’s not huge. And the eye relief gains may be worth it.
Click to expand...
I shot today, put it at 13.75" or so, as far back as i could. It feels okay mostly, prone is only time I really feel cramped, which is the position im least worried about.

Possible I need to change how I grip the rifle or the way I shoot. If I spend more time shooting the shorter LOP it might just become more comfortable from repetition or familiarity.
 
#21
I found prone or off a bench my elbow would be bent outward and the short LOP made it hard on my wrist and hand. But when shooting positional I drop my elbow down along my body and do my best to get it to rest on my hip or knee for extra stability. With my elbow down I have zero issues with my hand and wrist and actually find the shorter LOP more comfortable.
 
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