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Posted: 5/29/2010 12:00:34 PM EDT
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Went to the range today to try out my new AR and the bolt would not lock to the rear with my P-mags. USGI mags worked great. But the P-mags just kinda crapped out on me. Should I give the rifle time to break in, or toss the pmags for USGIs?
Also its a RRA lower with a BCM 16'' M4 type upper. Im running a BCM BCG and a Larue super duty Buffer spring. |
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Trade your Pmags for USGI mags. They may not look at tacticool, but they work. You should be able to find someone who will trade you two for one. Posted Via AR15.Com Mobile I agree. Although I have had nothing but good reliable Pmags I only own USGI's now. They are reliable and will fit any lower I may buy in the future. |
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Only time I've ever had a problem with P-mags is if I'm pressing hard on the bottom of the mag on that last shot (like on a non-ideal benchrest/prone position), the bolt won't lock back. Several friends with similar setups report the same thing. Off-hand or no weight on the mag, no issues.
Not sure if that was your situation... |
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Only time I've ever had a problem with P-mags is if I'm pressing hard on the bottom of the mag on that last shot (like on a non-ideal benchrest/prone position), the bolt won't lock back. Several friends with similar setups report the same thing. Off-hand or no weight on the mag, no issues. Not sure if that was your situation... it was off hand shooting. |
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I had the same problem but only when running a LMT 14.5. The same lower the LMT was on worked just fine with other uppers, so I don't think it was a bolt catch issue & the same Pmags worked just fine except with the LMT. Strange. Funny you mention this, I tried my 18" upper and the mags worked fine....So the mags work with my SPR upper, but not with an M4 type upper..Or I should say with a rifle length gas system over a carbine length gas system. Now if it were under gassed (M4 type) then it wouldnt lock back on any mags. but the SPR upper worked flawlessly with both type mags. |
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I've got 50 P mags & 150 USGI's. I won't trust the P's completely untill they have been through several wars like the USGI's! Are you sure that's enough? You should probably pick up a few more hundred! 
I have a similar ratio of Pmags to GI, although not nearly that many (probably about 15/40). I like the Pmags and haven't had any major troubles, but I'm not getting rid of my GIs. Ever. They have a proven track record over many years, and the Pmags are still relatively new. The minor trouble that I had with Pmags, was that in one of my lowers with early Pmags, it takes more than the normal amount of force to seat the mag into the mag catch (empty or full). But it still locks back on the last shot. GI mags and later revision Pmags seat with a normal amount of force. FWIW, it's an Armalite lower. |
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You could always call Magpul and ask them for help if you can't get ti worked out. I'm sure they know any quirks that may come up with their mags. All they will say is their mags are built to spec, it must be the rifle. That explains why my 2 Spikes lowers will drop the original P-Mags but not the M-Rev 
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| The Lancers have worked well for me as far as polymer AR mags go. I also have a supply of new G.I. mags as well as some C-Products black stainless steel which also work fine. It's a little hard to analyze what's happening in the AR because of visibility, but you can at least first open the action, put the mag in and see if it engages the bolt stop like the others also said. Close it up and yank the charging handle back and let it fly to see if the bolt stop does what it's supposed to with the suspect mag and others that are known to work. Release the bolt after it stops to check that function. Dummy rounds are great for troubleshooting and every AR owner should have a few. Otherwise you have to use live rounds. If you don't have a safe place to load live rounds, it's best not to. But, you could use a dummy to load and then yank the charginging handle again to see if the follower engages the stop. It could be the bolt stop as some have suggested, but since it works with the G.I.s it's probably the mag. Sometimes you have to trim the mag where it interferes with the stop. Other times you may have to deburr the follower or inside of the mag because the follower isn't rising quite far enough to hit the stop. This happens all the time with pistols - some mags work and some need tweaking. Sometimes the slide stop is too big and the bullet nose engages it. It's just another gun thing. You can fix it. |
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You could always call Magpul and ask them for help if you can't get ti worked out. I'm sure they know any quirks that may come up with their mags. All they will say is their mags are built to spec, it must be the rifle. That explains why my 2 Spikes lowers will drop the original P-Mags but not the M-Rev 
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You could always call Magpul and ask them for help if you can't get ti worked out. I'm sure they know any quirks that may come up with their mags. All they will say is their mags are built to spec, it must be the rifle. That explains why my 2 Spikes lowers will drop the original P-Mags but not the M-Rev Uh, no. Milewsky80, have you ever actually contacted us before? Since the PMAG is built to fit the Colt M16 occasionally you'll have incompatibility issues with some AR15s. HOWEVER, we will still try to resolve the issue and apparently our customer service is well known in this regard... |
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I've got 50 P mags & 150 USGI's. I won't trust the P's completely untill they have been through several wars like the USGI's! They have, and have also been found superior to USGI mags. Does Dr. Drake dream of polymer sheep? I don't know about him, but in my mag pouches...there are pmags. USGI, thou hast been found wanting. |
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Back to the mag issue.....you know PMags don't feed skittles... Hook up Mays first. It is Sgt. Mays now. Good thing you were practicing. If I remember, you need it.  Hey!! I shoot fine here in the mountains . And I will hook Sgt Mays up first..and damn a bunch of skittles!!!!
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I had a 30rd pmag that wouldn't lock the bolt back on my brand new spikes upper. (20's and usgi worked fine) I took the upper off and inserted mag, everything looked ok, bolt catch engaged like it should, but was a little gritty, so i oiled the crap out of the whole area and it appears to be working fine now.
I also took the mag apart and couldn't find any mold flashing or anything. I don't know it that helped or not. |
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