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Posted: 7/29/2013 5:07:35 PM EDT
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Hi guys, new to the sight. I just built my first ar. It is a dpms lower, aero upper, yhm 14.5 diamond fluted barrel. Took it out to shoot it for the first time last weekend and it shoots, ejects but doesn't feed. I am thinking the buffer is to heavy or the spring is to tight. It doesn't seem like it is bringing the bcg back far enough to load the next round. I am was shooting XTAC ammo. I'm not sure what buffer weight is in it , because I bought the buffer tube, spring and buffer as a "kit" from psa. Do you guys think I am correct on the buffer being the issue?
P.s I tried 3 diff pmags. |
| Yes I did lube the BCG pretty good before I fired it. No there was not a dimple in the barrel for the gas block. And yes I first fired it with 1 round an it fired good, but the BCG isn't coming back far enough to catch the latch and hold the bolt open. I'm going to pull it a part today when I get off work and check the gas block alignment. I will let everybody know! Thank you all for the help! |
| Something to keep in mind is that the barrel could be machined with room to install a handguard cap behind the gas block. If you are not installing a handguard cap, you may need to account for that thickness instead of just placing the gas block as far back as it will go on the barrel. Not sure if this is helpful in your case, but may be worth the time to take some measurements. |
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It is very unlikely to be the buffer.
It is more likely to be one of the usual problems with the gas system. Look for things like a blockage, broken carrier key screws, misaligned gas block, leaks, etc. There are other possibilities, but eliminate the usual ones first. There seems to have been a lot of broken screws lately. |
| I went through this a few months ago. I had all mislpec parts by good manufacturers. I was so frustrated with the rifle. It would run on one guys BCG and his only. I never could figure out what it was. So I poured oil in the damn gun and single shot hand loaded 30 rounds with the charging handle. Finally it would shoot 2 rounds, then 3, then 4, now it runs strong... I checked the gas block alignment, buffer weights, buffer tubes, springs, bolts... I was about to give up. I am guessing it was all just too tight to run. |
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Quoted:
Yes I did lube the BCG pretty good before I fired it. No there was not a dimple in the barrel for the gas block. And yes I first fired it with 1 round an it fired good, but the BCG isn't coming back far enough to catch the latch and hold the bolt open. I'm going to pull it a part today when I get off work and check the gas block alignment. I will let everybody know! Thank you all for the help! This is going to be your culprit. You most likely pushed the GB back against the shoulder on the barrel but you need space that would normally be reserved for the handguard cap. there are ways to fix it but the best ways require acquiring a tool. I made something similar to this When you take off the GB you might see a half moon mark around the hole in it that will show you the misalignment. |
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