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Cmp ar15 service rifle questions

I was going to say Rock River also. Get a National Match A2 or A4. The NMA2 is about $1375 the NMA4 $1450. The only thing I don't like about the A4 is the front sight. .7 MOA out of the box with Black Hills Match.
 
I have one complete RRA, on upper on a lower I built with their lower kit, and one rifle I built from new parts using their lower kit, but stock kit and free float hand guard.

BTW, if you buy the free float tube kit for new build you will need a sling swivel. They assume you have one already when you buy the upgrade.
 
Budget build: WOA barrel, BCM blem upper, Brownells BCG, used RRA float tube, Vortex PST MOA 1-4.5X

PRI low cantilevered mount places the scope center at 1.3" which is the same height as the rear sight aperture on an A2 upper.
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You can shoot 20 or 18 inch barrels. From the gas block forward it has to be .750 or less in diameter. The bird cage flash hider is not considered a brake.

CMP rules are a free PDF download and handy to have on a phone or printed for reference at a match. Some people don't know the rules but sound very knowledgeable until you look it up.