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Major changes as they occurred:
The rifle started off with BRT Covert Comp, but switched to FCD 6315 after a few K. Tried a Warcomp for 1k or so but went back to the 6315.
SLR AGB broke. SLR immediately replaced it. Decided to try BCM stock. Added Radian ambi safety.
4537 rounds: E-carrier replaced with standard carrier. The bbl is gassed smoothly enough the e-carrier seemed wasted. Detailed cleaning done.
5200 rounds: Approx this round count the gas block came loose, despite red loctite. SLR gas block replaced and pinned by BRT with BRT gas block.
5419 rounds: Replaced Aimpoint with Steiner P4xi 1-4 & and 1.93 ADM mount.
5450 rounds: Replaced Sionics trigger with Larue 2 stage. Felt like the trigger was too light (just under 4# iirc), added heavier spring.
Detailed cleaning around 6k rounds. Added RMR in 1.93 T Rex arms mount a few months ago, as Steiner never comes off 4x.
Added vert grip as a handstop.
Fired two 5-shot groups yesterday to check accuracy.
69gr SMK w/H322: 1.12"
62gr Horn BTHP w/XBR: 1.4"
FWIW, 55gr reloads with hornady bullets typically shoot <2.5moa.
Should probably check velocity.
Current plan is to continue shooting until groups open up. Gunsmith noted the throat is well worn, be interesting to see how much longer I get from it.
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