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POF 308 and magpul install issues

cybereyes

Private
Minuteman
Mar 1, 2004
14
0
Ft Bliss TX
Guys, I'm getting really frustrated and looking for some expert help. I just got back from a deployment and received my POF 308 rifle. I bought a PRS Magpul stock to install on it and have found out that there is very little info from POF, Magpul, or the FFA dealer I bought the gun from on the exact parts needed to install this stock. I have actually gotten several different stories and or some quick parts thrown out in a 30 second phone conversation as to what is needed, worse yet when you go to buy these parts they are very poorly labeled and not very descriptive. I do know I needed a different buffer tube, spring and buffer, but I think I have still ordered the wrong thing. I have read elsewhere that you need an A2 style carbine buffer/tube and spring, but like I said the parts aren't very well labeled on the various sites I have visited.

<span style="font-weight: bold">Eventually what I ordered was a DPMS LR-308 Buffer and spring and a DPMS receiver Extension buffer tube AR 15/a1-a2</span> . I put it all together and the first thing I noticed at the range was the when the bolt is locked to the rear, it is not back far enough to actually catch a round when it slides forward. I can manually pull it back and insert a round, and even when I fire the rifle most of the time it chambers a new round like it should, but not always. It also doesn't lock to the rear after the last round is shot. I am quite sure the buffer is too long, at the very least. But for all I know it's all wrong. I put the old buffer that came with the collapsible stock into the rifle and it allows the bolt to go back far enought to chamber a round, but ts catching on the actual bolt. I actually can't even remember now if it is suppose to catch on the bolt or bolt carrier, but my first thought was that it should be catching on the bolt carrier. Either way I know this buffer is too short. I need some help. I bought all my parts at midwayusa.
 
Re: POF 308 and magpul install issues

It sounds to me like you purchased the Magpul PRS for an AR-15 and not the AR-10 model.

You need to exchange it and the EXACT parts you need for the PRS is a standard A2 buffer tube, rifle length buffer, and rifle length buffer spring.
 
Re: POF 308 and magpul install issues

Check this POF data link with the gear you have installed. This is a tech bulletin from the POF website that illustrates what's needed for the rifle buffer vs the carbine buffer.

POF Rifle buffer details

When I put mine on, I used a Tubbs CS flat wire spring, plus the tube/buffer listed by Killshot above, and also followed Hellbender's tutorial on adjusting bolt catch over run.

Hellbenders Excellent Tutorial on Adjusting Bolt Catch Over run
 
Re: POF 308 and magpul install issues

If you can check your original Midway order info, the Magpul part number you want is MAG308. The AR15 stock number from Magpul is MAG307.
 
Re: POF 308 and magpul install issues

Well I bought the Magpul stock from the same company I bought the gun, Hinterland outfitters. They owed me a credit because of some mags and a case that were no longer available. So I didn't even pick it out, the tech just put it in the box. It says on the box it's for an AR 10/SR25 or AR15/M16? I will check out the links you provided and try and figure this out. Thanks , will keep you posted.
 
Re: POF 308 and magpul install issues

So when I'm searching for those parts I just search rifle length buffer tube and spring? What confused me to begin with is they were saying some of the parts were the same as the AR 15 parts, so the part is listed as an AR15 part. I got worried and bought all the parts from midway that said LR 308 based on some reviews I was reading from others that purchased those parts
 
Re: POF 308 and magpul install issues

You need a DPMS LR-308 buffer and operating spring. Both are heavier than the AR15 versions.

You need an AR15/M16 RIFLE length receiver extension. This is the same for a .308 or .223 rifle.

You will need the AR10/SR25 Magpul PRS. There is a difference in the cheek riser.
 
Re: POF 308 and magpul install issues

Ok so now I'm more confused. Maybe my tube is the wrong size. My spring looks to be correct based on that link, it has 38 coils. They list the buffer to be 5.31, mine is 5.25, do they make them .6 inches longer? They dont tell you the size when you buy it either. I looked up Magpul 308 on midway USA and on the side where it list other parts bought with this item, are all the parts I bought. This sux.
 
Re: POF 308 and magpul install issues

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: LoneWolfUSMC</div><div class="ubbcode-body">You need a DPMS LR-308 buffer and operating spring. Both are heavier than the AR15 versions.

You need an AR15/M16 RIFLE length receiver extension. This is the same for a .308 or .223 rifle.

You will need the AR10/SR25 Magpul PRS. There is a difference in the cheek riser. </div></div>

Those are the exact parts I bought . I listed those parts in my first post. The bolt will not go deep enough to chamber a round
 
Re: POF 308 and magpul install issues

It is sort of frustrating to put this together. I remember having to triple check details to make sure I was getting the right parts.

Tomorrow I will send you a list of part numbers for the tube, spring and buffer. You can check them against what you have to see what's good to keep and what needs to be replaced. In the interim, spend some time with the POF data sheet, measure your spring , measure your buffer. Also, Hellbender's tutorial is good stuff for fine tuning your rifle to operate smoothly and efficiently.

Regarding the Magpul PRS, here's a link with pics illustrating the difference between the two:
Magpul PRS AR10 vs AR15
 
Re: POF 308 and magpul install issues

Based on that hellbenders post, I need to check the length of that Buttstock screw, I seem to remember it was pretty long. I would think these things would be much more precise. It's lucky I even bought that screw. Just reading reviews of the parts I bought and someone said don't forget the screw because it's not included. Otherwise I would have never known about it. This whole experience has been pretty disappointing
 
Re: POF 308 and magpul install issues

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: cybereyes</div><div class="ubbcode-body">.......I can manually pull it back and insert a round, and even when I fire the rifle most of the time it chambers a new round like it should, but not always. It also doesn't lock to the rear after the last round is shot.</div></div>

If the parts are all correct, and it works some of the time, then perhaps it is another variable. What ammo are you shooting? Have you checked the piston and rod?

Did you check the length of the screw that fastens the PRS to the buffer tube? Is the buffer hitting this screw, ie is the screw too long? I remember this being an issue for some people.
 
Re: POF 308 and magpul install issues

Looks like I'm 6 mins 42 secs behind you!

I now remember that I had to cut the screw that came with the PRS. I also put in two quarters to get the bolt carrier over run to the perfect position, so my POF is worth 50 cents more than when I got it.
smile.gif
 
Re: POF 308 and magpul install issues

Well I shined a flashlight down the tube and it seriously doesn't look like it extends into the tube. I will have the read the other part again about the quarters to figure out what he is saying. I may end up needing to spend more money as a gun smith if the parts I have are correct.
 
Re: POF 308 and magpul install issues

If your buffer is hitting the screw there will be an indentation in the plastic at the end of the buffer. I put the quarters in because my bolt was going too far past the bolt catch.
 
Re: POF 308 and magpul install issues

What I'm curious about is what you guys are doing wrong because if you purchase the correct parts, you shouldn't have any of the issues that have been mentioned, modify or add quarters to anything. I've installed the Magpul PRS on several rifles and haven't needed to modify anything.

The correct parts being a standard A2 (rifle length) buffer tube, rifle length buffer, and rifle length buffer spring.

If you don't have the correct spring or buffer, it will not have enough resistance to chamber a round when the BCG returns.

If you don't have the correct model of the Magpul PRS for your rifle, such as using an AR-15 version on the POF 308, you won't be able to pull the charging handle all the way back due to the cheek riser being in the way.
 
Re: POF 308 and magpul install issues

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KillShot</div><div class="ubbcode-body">What I'm curious about is what you guys are doing wrong because if you purchase the correct parts, you shouldn't have any of the issues that have been mentioned, modify or add quarters to anything. I've installed the Magpul PRS on several rifles and haven't needed to modify anything.

The correct parts being a standard A2 (rifle length) buffer tube, rifle length buffer, and rifle length buffer spring.

If you don't have the correct spring or buffer, it will not have enough resistance to chamber a round when the BCG returns.

If you don't have the correct model of the Magpul PRS for your rifle, such as using an AR-15 version on the POF 308, you won't be able to pull the charging handle all the way back due to the cheek riser being in the way. </div></div>

I feel the exact same way, which is why I am discouraged at all the filing off of screws and adding quarters talk, but I don't know what to do. I have over 4k invested in this gun so far including scope, and don't like the thought of grinding off parts to get it to work correctly. BUT, you see the parts I bought, are they the wrong parts? It appears by measurement, descriptions, and other gun owners description that I have the correct parts, aside from the .6 cm my buffer is off from the POF description of the correct buffer. 5.25 versus 5.31.

Do you happen to have part numbers? I know it's a pain in the ass, but I'm lost at what to do now. The parts I have seen so far are NOT listed as " rifle length buffer" or "rifle length spring" . The one I bought which was the closest thing I could find based on description was DPMS LR-308 buffer and DPMS LR-308 buffer spring. I bought the DPMS receiver extension buffer tube AR15 A1/A2 Stock tube. Yes it says AR15 in the title, but everyone keeps telling me they are the same thing as long as it says A2 style.

So with that said, the bolt will still not go far enough into the tube to allow the front of the bolt to meet the bolt catch, the bolt catch is holding the bolt back by the bolt carrier. So I really don't think quarters are even going to help now that I understand what they are doing .
 
Re: POF 308 and magpul install issues

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: cybereyes</div><div class="ubbcode-body">Based on that hellbenders post, I need to check the length of that Buttstock screw, I seem to remember it was pretty long. I would think these things would be much more precise.</div></div>

Did you use the screw that MAGPUL included with the PRS? Because it is a different length from the regular A2 buttstock screw.
 
Re: POF 308 and magpul install issues

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: LoneWolfUSMC</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: cybereyes</div><div class="ubbcode-body">Based on that hellbenders post, I need to check the length of that Buttstock screw, I seem to remember it was pretty long. I would think these things would be much more precise.</div></div>

Did you use the screw that MAGPUL included with the PRS? Because it is a different length from the regular A2 buttstock screw. </div></div>

I don't recall it coming with a screw for that. I'm pretty sure it did not as a matter of fact. Either way, I checked and the screw is not protruding out too far.
 
Re: POF 308 and magpul install issues

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: cybereyes</div><div class="ubbcode-body">I don't recall it coming with a screw for that. I'm pretty sure it did not as a matter of fact.</div></div>

It should have. The screw would have been stapled to the instruction sheet and have loctite pre-applied.

I suggest you remove the screw completely and cycle the action on the rifle. See if you still have the same issue.
 
Re: POF 308 and magpul install issues

I the charging handle hitting the raised plastic cheek piece on the stock - when the bolt isn't far enough back to lock = ar16 stock = get a10 version or cut 3/4" off plastic raiser (that is what i did, stock was a good $ deal)

^ like Lonewolf said , make sure the screw that hold the stock to tube isn't too long
 
Re: POF 308 and magpul install issues

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Pat M</div><div class="ubbcode-body">I the charging handle hitting the raised plastic cheek piece on the stock - when the bolt isn't far enough back to lock = ar16 stock = get a10 version or cut 3/4" off plastic raiser (that is what i did, stock was a good $ deal)

^ like Lonewolf said , make sure the screw that hold the stock to tube isn't too long </div></div>

I appreciate the suggestions guys, but I think I can rule out the stock being the wrong one. The charging handle does not hit the cheek piece, the box has AR10/SR25 printed right on the box. Everything about this stock says its the correct one. I just don't know about everything else.

I will pull that screw out today to totally rule it out, but by looking at it, it appears to be flush and not sticking out, and there are no marks on the end of my buffer to indicate its hitting that screw.
 
Re: POF 308 and magpul install issues

Give me a call I can tell you how to fix it most likely 254-275-7335 Mark

Have installed one on mine and been threw this already.
 
Re: POF 308 and magpul install issues

Well I hope you can help, I will try and give you a call tomorrow. My name is Joe.
Thanks
 
Re: POF 308 and magpul install issues

The guys are correct, the PRS stock should have come with the short screw with loc-tite on it should have come with the screw in a plastic bag stabled to the instruction sheet. I bought one of my PRS kit from Brownell's. It comes with all the parts you need for the installation in my LMT MWS 308. A second kit was purchased from DSG Arms which supplies The same parts the DPMS SASS has in it. The PRS 308 stock, AR 10 buffer, recoil spring and receiver extension. It was installed In my AR 10-AP4 and worked fine.
I hope you get your POF working. Many thanks for your service
 
Re: POF 308 and magpul install issues

Well I just took out that screw completely and WTF, the bolt now goes all the way down. I guess I have to start looking to see if I dropped the original screw somewhere, because I don't recall seeing it in the box.
 
Re: POF 308 and magpul install issues

By the way, can anyone tell me how long this screw is suppose to be. Dont think I'm going to find the other one, so I may have to figure out a way to saw this one off. The screw I have now is a little over an inch long, about 1.12 to be exact.
 
Re: POF 308 and magpul install issues

My PRS came with a screw that was too long and lacked the vent hole. I called and they apologized, suggested it was a problem with one of their vendors, then offered to send another of the correct dimension and with a vent hole. I declined, but noted their willingness to step up. I was actually more interested to learn whether or not the vent hole was needed. Magpul indicated that it's for draining water when you swim with your rifle, or leave it out in the rain...not for venting air during cycling.

I used a paperclip with a bent tip to determine the depth of the hole, and cut the screw to proper length with a hacksaw. A little file work to smooth the threads, some loctite, and it was good to go. I don't remember the final length.

Here's a thread from last year that discusses the screw length. I do not know if the length listed is correct for your stock.

Magpul PRS causing FTF
 
Re: POF 308 and magpul install issues

The screw on mine is the one with the vent hole and is .740 TOTAL length. Threaded length is .600. Hope this helps you out. This is for the AR-10
 
Re: POF 308 and magpul install issues

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: xp100man</div><div class="ubbcode-body">The screw on mine is the one with the vent hole and is .740 TOTAL length. Threaded length is .600. Hope this helps you out. This is for the AR-10 </div></div>

Actually it does help. I sawed the screw off the best I could with a dremmel. It messed some of the threads up though and it will not go in now. Tomorrow I will try and use a thin file to see if I can get it to work. I also bought a buttstock screw from midway, but as usual there isn't much of a description. So it may not even work. If not then I guess I will call Magpul as some have suggested. Actually I may do that anyway.