Originally Posted by
redsnake
So got to the range and had some issues... First round chambered fine, fired but failed to eject. Not sure if the chamber was a bit tight or what... but cleared it and fired a few more rounds without incident. I had laser bore sighted the rifle prior to my range trip. My first 5 shots (50 yards) barely hit the target and were scattered all over the place... perhaps grouping of 16-20" groups. It was HORRIBLE. So in lieu of wasting ammo and time I bagged her up and shot my AR10 and a couple pistols before coming home. I called Rise Armament and they told me it was possible it was a defective barrel and they'd swap it out if I wanted. I took her apart, swapped out barrels for another 16" RA barrel and got it all back together. This time I also decided to not use the Lantac Dragon brake is it it didn't want to thread on the barrel very well. The thread cuts were not good on the Dragon and I had to re-tap the initial threads to get it started. Not sure if it was defective or if this is normal for the Lantac muzzle brake. I had also picked up a Surefire Muzzle brake and decided to use that one on the new barrel. It was late by the time I got my rifle back together so I haven't been able to test it out again.
The ammo I was shooting was American Eagle 62gr Green Tip... it was a new mass batch of ammo but I didn't think it would cause the rifle to be that bad. I didn't see any tumbling/tears in the target but it was horrible. It could be the ammo, barrel or muzzle brake that was causing it. I have no idea... Any suggestions?
Hopefully next time to the range will be a different story and she'll be a sub moa rifle. I'll be sure and take my other trusty AR and see if it shoots the American Eagle 62 grn stuff ok and also take a few other 5.56 type of ammo to test out in my new rifle. Here's hoping it turns out to be something simple.
I've had accuracy issues with XM855 before. You might try some 55gr .223 Rem as a starting point and see if it groups any better. Sometimes you just need to find the right round for a particular barrel. Good luck and please keep the updates coming.
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Thomas Jefferson
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