got a strange issue with a DPMS bolt.
i did the 15min trigger mod to a few of my shooters --all of um seem fine "Except" one.
this one unit gets a few soft primer hits on hard Russian primers, i like thinking "it has to be the trigger mod" so i slap a fresh spring in there --and go back to shooting and after a few rounds --it is getting dented primers along with the FTF.
i collect the rounds that dented and put them in another ar-15 with the trigger/spring mod and they all go bang-bang!-- im thinking WTF is going on here?
-- i am running a new bolt a DPMS -- i wonder if there is an issue with its OAL and the firing pin travel is too short?
this seems like the exact problem you run into on a 7.62x39 conversion with its deep set primers--
i think i am going to relieve the bolt a little on the back and see if that helps any--