Putting a Magpul prs on my rra lar?
- Thread starter toddconley
- Start date
Re: Putting a Magpul prs on my rra lar?
It will work fine as long as you add a 1" buttstock extender which permits the longer RRA LAR-8 charging handle enough room to clear the cheek riser if it is raised even a little bit.
See here:
http://www.midwayusa.com/viewProduct/default.aspx?productNumber=613589
If you are going to run the stock without raising the cheek riser any, the PRS will work without any additions/modification on the LAR-8.
It will work fine as long as you add a 1" buttstock extender which permits the longer RRA LAR-8 charging handle enough room to clear the cheek riser if it is raised even a little bit.
See here:
http://www.midwayusa.com/viewProduct/default.aspx?productNumber=613589
If you are going to run the stock without raising the cheek riser any, the PRS will work without any additions/modification on the LAR-8.
Re: Putting a Magpul prs on my rra lar?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ORD</div><div class="ubbcode-body">It will work fine as long as you add a 1" buttstock extender which permits the longer RRA LAR-8 charging handle enough room to clear the cheek riser if it is raised even a little bit.
See here:
http://www.midwayusa.com/viewProduct/default.aspx?productNumber=613589
If you are going to run the stock without raising the cheek riser any, the PRS will work without any additions/modification on the LAR-8. </div></div>
+1
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ORD</div><div class="ubbcode-body">It will work fine as long as you add a 1" buttstock extender which permits the longer RRA LAR-8 charging handle enough room to clear the cheek riser if it is raised even a little bit.
See here:
http://www.midwayusa.com/viewProduct/default.aspx?productNumber=613589
If you are going to run the stock without raising the cheek riser any, the PRS will work without any additions/modification on the LAR-8. </div></div>
+1
Re: Putting a Magpul prs on my rra lar?
<span style="text-decoration: line-through">The only difference between a PRS for a .223/5.56 and one for .308 is the cheekpiece is shorter to accomodate the longer charging handle on the .308. Magpul sells a kit to convert a .223/5.56 to the .308 cheekpiece. It's not advertised, so you'll have to call them. Last I knew it was $24.95.</span>
ETA: Disregard my advise: LAR8 charging handle is longer than other 308 AR's. Conversion kit still won't clear. Extension is the only way to go as posted above. My apologies.
<span style="text-decoration: line-through">The only difference between a PRS for a .223/5.56 and one for .308 is the cheekpiece is shorter to accomodate the longer charging handle on the .308. Magpul sells a kit to convert a .223/5.56 to the .308 cheekpiece. It's not advertised, so you'll have to call them. Last I knew it was $24.95.</span>
ETA: Disregard my advise: LAR8 charging handle is longer than other 308 AR's. Conversion kit still won't clear. Extension is the only way to go as posted above. My apologies.
Re: Putting a Magpul prs on my rra lar?
I put the regular PRS on my DPMS 308, just notched the cheek piece (not a big deal at all)
I put the regular PRS on my DPMS 308, just notched the cheek piece (not a big deal at all)
Re: Putting a Magpul prs on my rra lar?
Ok now for the dumb questions. I need a a2 tube, spring, and buffer? I currently have a collapsable stock.
Ok now for the dumb questions. I need a a2 tube, spring, and buffer? I currently have a collapsable stock.
Re: Putting a Magpul prs on my rra lar?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: toddconley</div><div class="ubbcode-body">Ok now for the dumb questions. I need a a2 tube, spring, and buffer? I currently have a collapsable stock. </div></div>
Not a dumb question. YES...you need an A2 buffer tube, a .308 buffer and recoil spring. However, not just any .308 buffer will work as once again, RRA went proprietary on that part. The RRA LAR-8 rifle buffer is approx. 0.5" shorter than the Armalite/DPMS/KAC/etc. .308 rifle buffers.
You can go factory, or you can go custom with one of Slash's (Clint Butler's) buffers as seen here: http://www.heavybuffers.com/
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: toddconley</div><div class="ubbcode-body">Ok now for the dumb questions. I need a a2 tube, spring, and buffer? I currently have a collapsable stock. </div></div>
Not a dumb question. YES...you need an A2 buffer tube, a .308 buffer and recoil spring. However, not just any .308 buffer will work as once again, RRA went proprietary on that part. The RRA LAR-8 rifle buffer is approx. 0.5" shorter than the Armalite/DPMS/KAC/etc. .308 rifle buffers.
You can go factory, or you can go custom with one of Slash's (Clint Butler's) buffers as seen here: http://www.heavybuffers.com/
Re: Putting a Magpul prs on my rra lar?
Do you see any problem using the factory buffer? What do I gain with the fancy buffer?
Thanks again,
T
Do you see any problem using the factory buffer? What do I gain with the fancy buffer?
Thanks again,
T
Re: Putting a Magpul prs on my rra lar?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: toddconley</div><div class="ubbcode-body">Do you see any problem using the factory buffer? What do I gain with the fancy buffer?
Thanks again,
T</div></div>
For what it's worth, I have a factory DPMS rifle buffer and spring in my POF P-308 20" and I have never had any issues.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: toddconley</div><div class="ubbcode-body">Do you see any problem using the factory buffer? What do I gain with the fancy buffer?
Thanks again,
T</div></div>
For what it's worth, I have a factory DPMS rifle buffer and spring in my POF P-308 20" and I have never had any issues.
Re: Putting a Magpul prs on my rra lar?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: toddconley</div><div class="ubbcode-body">Do you see any problem using the factory buffer? What do I gain with the fancy buffer?
Thanks again,
T </div></div>
It all comes down to your intended use of the rifle.
The heavy buffers (like Slash's) are excellent if you are going to be running your rifle suppressed as the addt'l buffer weight helps to slow the action/cycling down, easing recoil and wear/tear on your rifle. On an unsuppressed rifle, the heavy buffers can reduce recoil somewhat...especially if you are running heavier loads, etc.
If the above issues don't apply to your situation/intended use of the rifle, then the factory, 4.5oz buffer should work just fine for you.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: toddconley</div><div class="ubbcode-body">Do you see any problem using the factory buffer? What do I gain with the fancy buffer?
Thanks again,
T </div></div>
It all comes down to your intended use of the rifle.
The heavy buffers (like Slash's) are excellent if you are going to be running your rifle suppressed as the addt'l buffer weight helps to slow the action/cycling down, easing recoil and wear/tear on your rifle. On an unsuppressed rifle, the heavy buffers can reduce recoil somewhat...especially if you are running heavier loads, etc.
If the above issues don't apply to your situation/intended use of the rifle, then the factory, 4.5oz buffer should work just fine for you.
Re: Putting a Magpul prs on my rra lar?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KillShot</div><div class="ubbcode-body">For what it's worth, I have a factory DPMS rifle buffer and spring in my POF P-308 20" and I have never had any issues. </div></div>
That's great and all, but it doesn't mean anything in this situation as they are completely different buffers/lengths/weights than the RRA LAR-8/308 buffers and will NOT work in the RRA. The POF can use/interchange the DPMS LR-308 buffers/springs/etc. unless you run an AR-15 carbine stock setup...then you'll need the specific, shortened heavy buffers like those available from Slash and others.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KillShot</div><div class="ubbcode-body">For what it's worth, I have a factory DPMS rifle buffer and spring in my POF P-308 20" and I have never had any issues. </div></div>
That's great and all, but it doesn't mean anything in this situation as they are completely different buffers/lengths/weights than the RRA LAR-8/308 buffers and will NOT work in the RRA. The POF can use/interchange the DPMS LR-308 buffers/springs/etc. unless you run an AR-15 carbine stock setup...then you'll need the specific, shortened heavy buffers like those available from Slash and others.
Re: Putting a Magpul prs on my rra lar?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ORD</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KillShot</div><div class="ubbcode-body">For what it's worth, I have a factory DPMS rifle buffer and spring in my POF P-308 20" and I have never had any issues. </div></div>
That's great and all, but it doesn't mean anything in this situation as <span style="font-weight: bold">they are completely different buffers/lengths/weights than the RRA LAR-8/308 buffers and will NOT work in the RRA.</span> The POF can use/interchange the DPMS LR-308 buffers/springs/etc. unless you run an AR-15 carbine stock setup...then you'll need the specific, shortened heavy buffers like those available from Slash and others.</div></div>
Ah, I see. That much I did not know. Thanks for clarification, ORD.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ORD</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KillShot</div><div class="ubbcode-body">For what it's worth, I have a factory DPMS rifle buffer and spring in my POF P-308 20" and I have never had any issues. </div></div>
That's great and all, but it doesn't mean anything in this situation as <span style="font-weight: bold">they are completely different buffers/lengths/weights than the RRA LAR-8/308 buffers and will NOT work in the RRA.</span> The POF can use/interchange the DPMS LR-308 buffers/springs/etc. unless you run an AR-15 carbine stock setup...then you'll need the specific, shortened heavy buffers like those available from Slash and others.</div></div>
Ah, I see. That much I did not know. Thanks for clarification, ORD.
Re: Putting a Magpul prs on my rra lar?
just ordered all the factory kit minus the stock. will be placing the order for the prs. Do I forsure need the spacer or is the dremel better? I am not forsure about adding a inch the stock?
t
just ordered all the factory kit minus the stock. will be placing the order for the prs. Do I forsure need the spacer or is the dremel better? I am not forsure about adding a inch the stock?
t
Re: Putting a Magpul prs on my rra lar?
I briefly considered trying one of those QD socket end-plates to put some space between the stock and lower receiver. However, I did not have enough funds to try that out, and try out various end screws to secure the stock to the receiver extension (aka buffer tube).
You can always elect to chop the cheek piece, but I decided against that as (a) I wanted to avoid having my RRA look like a POS and (b) did not want to end up with a cheek piece that was too short for my cheek to rest on (probably not a legitimate concern).
The $30 stock spacer will work, but, feel free to be a guinea pig and try out the other stock solutions.
I briefly considered trying one of those QD socket end-plates to put some space between the stock and lower receiver. However, I did not have enough funds to try that out, and try out various end screws to secure the stock to the receiver extension (aka buffer tube).
You can always elect to chop the cheek piece, but I decided against that as (a) I wanted to avoid having my RRA look like a POS and (b) did not want to end up with a cheek piece that was too short for my cheek to rest on (probably not a legitimate concern).
The $30 stock spacer will work, but, feel free to be a guinea pig and try out the other stock solutions.
Re: Putting a Magpul prs on my rra lar?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: toddconley</div><div class="ubbcode-body">Do I forsure need the spacer or is the dremel better? I am not forsure about adding a inch the stock?
t </div></div>
That's your call. It will work either way...just depends on whether you want a little extra LOP or whether you would be more comfortable/better off cutting a relief in the leading edge of your cheekpiece riser.
If you do go the cut/relief route...Measure twice, cut once. I'd personally put the stock in a vice, mark carefully where you need to cut and how much relief you need. Then use a fine cut-off wheel to do the work. Better to not remove enough at first than to hack the crap out of your stock and have it look like hell. You can always go back and slowly remove addt'l material with some sandpaper, hand file, etc. Fine grit sandpaper will also help you to "clean up" where you made your cuts. A high-speed cut-off wheel will probably burn/melt the polymer of the stock and depending on how it clings to the wheel, you may need more than one to accomplish the job. Anyway...just some rambling thoughts on the process.
Good luck and if you do go the "hack it up" route, be sure to post some pics of the finished product.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: toddconley</div><div class="ubbcode-body">Do I forsure need the spacer or is the dremel better? I am not forsure about adding a inch the stock?
t </div></div>
That's your call. It will work either way...just depends on whether you want a little extra LOP or whether you would be more comfortable/better off cutting a relief in the leading edge of your cheekpiece riser.
If you do go the cut/relief route...Measure twice, cut once. I'd personally put the stock in a vice, mark carefully where you need to cut and how much relief you need. Then use a fine cut-off wheel to do the work. Better to not remove enough at first than to hack the crap out of your stock and have it look like hell. You can always go back and slowly remove addt'l material with some sandpaper, hand file, etc. Fine grit sandpaper will also help you to "clean up" where you made your cuts. A high-speed cut-off wheel will probably burn/melt the polymer of the stock and depending on how it clings to the wheel, you may need more than one to accomplish the job. Anyway...just some rambling thoughts on the process.
Good luck and if you do go the "hack it up" route, be sure to post some pics of the finished product.
Re: Putting a Magpul prs on my rra lar?
I am not a bit afraid to cut the stock. However I dont want to cut it then find I actually needed the room but now dont have it which is the reason I am going away from the colaspable unit in the first place. The gun shoots like a house afire but the cheek weld makes it very hard to hold on to consitantly.
I am not a bit afraid to cut the stock. However I dont want to cut it then find I actually needed the room but now dont have it which is the reason I am going away from the colaspable unit in the first place. The gun shoots like a house afire but the cheek weld makes it very hard to hold on to consitantly.
Re: Putting a Magpul prs on my rra lar?
Please hijack away. I need to know as well. I am pretty sure I am about to take the dremel to it though. All parts are in route.
Please hijack away. I need to know as well. I am pretty sure I am about to take the dremel to it though. All parts are in route.
Re: Putting a Magpul prs on my rra lar?
Please post pics when you're done! I ended up setting my scope a little further back than I would have liked to compensate for that 1" spacer. I'd like to see how you pull yours off.
*ETA*
Looks like this might be the ticket:
http://www.brownells.com/.aspx/pid=27641/Product/AR_15_M16_END_PLATE_SLING_MOUNTS
Please post pics when you're done! I ended up setting my scope a little further back than I would have liked to compensate for that 1" spacer. I'd like to see how you pull yours off.
*ETA*
Looks like this might be the ticket:
http://www.brownells.com/.aspx/pid=27641/Product/AR_15_M16_END_PLATE_SLING_MOUNTS
Re: Putting a Magpul prs on my rra lar?
You will need a min. of approx. 1/2" of additional length/space to avoid the longer RRA CH contacting the cheek riser. I don't believe that the Troy A2-type sling adapters will give you the addt'l length required, but if you contact Troy, they can probably give you a specific length of their sling mounts so you'll know for sure before you spend the money.
The only other thing you could do (besides the 1" spacer and cutting relief out on your cheek riser) would be to either try to find a smaller/shorter buttstock extension (which they used to make at one time), or to modify the 1" extension down to around 5/8" or so.
You will need a min. of approx. 1/2" of additional length/space to avoid the longer RRA CH contacting the cheek riser. I don't believe that the Troy A2-type sling adapters will give you the addt'l length required, but if you contact Troy, they can probably give you a specific length of their sling mounts so you'll know for sure before you spend the money.
The only other thing you could do (besides the 1" spacer and cutting relief out on your cheek riser) would be to either try to find a smaller/shorter buttstock extension (which they used to make at one time), or to modify the 1" extension down to around 5/8" or so.
Re: Putting a Magpul prs on my rra lar?
I think I am going to cut. Is it a relief cut under or is it a straight cut off? Do I forsure need to raise the cheek piece? I am running a egw 20 moa down on mine.
I think I am going to cut. Is it a relief cut under or is it a straight cut off? Do I forsure need to raise the cheek piece? I am running a egw 20 moa down on mine.
Re: Putting a Magpul prs on my rra lar?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: toddconley</div><div class="ubbcode-body">I think I am going to cut. Is it a relief cut under or is it a straight cut off? Do I forsure need to raise the cheek piece? I am running a egw 20 moa down on mine. </div></div>
I don't know if you need the cheek piece raised or not...it is YOUR rifle and scope and should be fitted to YOU depending on the height you mount the scope (with your riser/rings). As I said before in this thread...if you don't have to raise the cheekpiece, then the buttstock extension or relief cut are purely academic as you won't need to worry about it.
If you do have to raise the cheekpiece, then whether it is a straight-on/cut from the top relief or it is an undercut will depend on how high you raise it.
Best to just wait until you have all the parts/scope/mount/rings in hand...put everything together and then determine what you want to do or what's best for your particular applications.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: toddconley</div><div class="ubbcode-body">I think I am going to cut. Is it a relief cut under or is it a straight cut off? Do I forsure need to raise the cheek piece? I am running a egw 20 moa down on mine. </div></div>
I don't know if you need the cheek piece raised or not...it is YOUR rifle and scope and should be fitted to YOU depending on the height you mount the scope (with your riser/rings). As I said before in this thread...if you don't have to raise the cheekpiece, then the buttstock extension or relief cut are purely academic as you won't need to worry about it.
If you do have to raise the cheekpiece, then whether it is a straight-on/cut from the top relief or it is an undercut will depend on how high you raise it.
Best to just wait until you have all the parts/scope/mount/rings in hand...put everything together and then determine what you want to do or what's best for your particular applications.
