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  • I need held diagnosing AR15 accuracy issues after new parts were added.

    Posted by Robert on December 20, 2019 at 4:16 pm

    So I built this AR15 back in 2016 when I thought Hillary was going to be elected with cheap parts. I had a cheapo Bear Creek Barrel, Yankee Hill handguard, etc. So I figured now I have some expendable cash I would upgrade.
    I got a 10″ DDM4 rail, a nice Ballistic Advantage barrel, and since I got a new barrel I picked up a new NiB Toolcraft BCG. For the record I have a Vortex Sparc II red dot + magnifier.
    I took it to the range yesterday and my groups were all over the place at 100yds. There almost was no rhyme or reason to it. Now I consider myself a decent shooter, my groups with my AR10 and AK were tight. I was using Federal Lake City 55gr off strippers that I’ve used to great success before. I shot about 100rds, and for the first 10 shots cleaned the bore after each shot. **My very first 5 group was solid but after that it was all over.**
    Would cleaning the bore with a snake from muzzle to chamber fuck up a new barrel? I had to do this because my bore snake was getting caught in my brake.
    I was thinking maybe my barrel nut was not tight enough, because my torque wrench is a cheapo harbor freight. But it fired okay and didn’t blow up. It was torqued to 35ft/lbs.
    Does a DDM4 rail have any special requirements? My low profile gas block barely clears it. Maybe by 1/8 of an inch. Is the barrel whip causing accuracy issues?
    Due to my magnifier and BUIS, my Sparc II sits maybe 1 rail length on to my handguard, but is still 90% on my upper receiver. This was my set with my Yankee Hill rail, however, I had no issues.
    Any troubleshooting help or advice would be appreciated guys, thanks it advance.

    Robert replied 3 years, 1 month ago 2 Members · 1 Reply
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