Quoted:
I am wanting to purchase a le6920, but I was wanting to know what kind of accuracy I can expect out of the box using high powered scope. I am thinking maybe 2 moa is maximum. The best I can get from my Colt H Bar is consistant 1.5 moa
It depends on ammo, conditions, optics and shooter skill level so it varies all the time, the carbine is not a precision rig but it should be capable to get 2 MOA and less with precision loads.
I'm including an older thread by member Molon which a Colt lightweight 16" barrel was tested at 100 yd with 10 shot groups using match hand loads, the barrel profile of the lightweight and the 6920's M4 government profile barrel are the same under the handguards so their results are going to be similar, his best group was 0.96" and worst was 2.24".
I've got two 6920 carbines, a newer LE6920 I bought early this year and an older SP6920 (Sporter marked) I bought last year, both at 100 yd using Hornady TAP 75 grain my best group are 1.2" the worst are under 2 MOA.
I'm shooting from a concrete bench with a rifle rest placed at the rear end of my handguards close to the barrel nut and a 12X scope.
http://www.ar15.com/forums/t_3_118/486023_.html