lablover Posted May 21, 2015 Report Share Posted May 21, 2015 Bolt won't lock back on last round So first let me start by saying new build was working great with the Federal Factory ammo. The first 20 shots went great without any issues. I used factory ammo to be on the safe side. I also shot some of my reloads after the box of factory and she ran like a champ. So, being I couldn't leave well enough alone. I decided to change out the fixed gas block and A2 stock. I installed a Syrac Gen 2 adjustable gas block and a Magpul PRS stock. Keep in mind I did not change the spring that I got with the DPMS Stock, buffer, spring Buffe tube kit from DPMS for 308. Anywho. I loaded the following loads new loads so I was starting low and worked up. Clean BCG and Rifle First load was with the Syrac gas blocked closed half way. Load was as follows First load was..... 40.5 Gr IMR 4064 175 gr SMK all single loaded all fired and bolt locked back on each round. Pretty happy so went to the next load 41.0 gr IMR 4064 175ge SMK First shot..bolt locks back but not all the way back. I figured I was on the raged edge with the gas block so opened up a few click. Every shot after that no bolt lock back.....grrrrrr Decided to open the block up all the way and fire the next groups 41.7 gr 4064 175 ge smk. Bolt wont lock back. Had the rifle on the bags so I even tried it off the bags..No lock back. Here are my questions. Is this just a break in issue? Are my loads ...wimppy. I even tried some Ball LC ammo and it locked back but once it failed too Tried a different Mag...Worked fine but one didn't lock back I thought when I first did the build with the fixed gas block all went great with the Fed gold medal match and no issues at all. I did not try to load more than one round until I get this figured out. I'm gonna take the Syrac block off and make sure I have everything ligned up correct. I did use a different gas tube with the Syrac too..Not sure that matters. Not even sure the MAgpul PRS can be an issue because with the A2 stock it worked fine with the spring/buffer I have. All ears guys. Lookin for some suggestions. I will say the 41.0 gr load was a hammer..Stuck all 5 shots in one single ragged hole at 100. Mega Arms Megalithic upper and lower (set) Mega Arms 20" Barrel BCM GAs Block..Fixed.....Now Syrac gen 2 Adj. Surefire SFMB-762 Muzzle Break LMT BCG and Bolt Vortex Viper pst 6-24 FFP ADM 20 MOA rings and Base set Giesslee 2 stage Match trigger Not sure what I might of forgot? Thanks for listening Joe Quote Link to comment Share on other sites More sharing options...
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