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Shawn, do you mean 55 grain? 155 would be some insanely heavy bullets for 5.56. 55gr 5.56 should work perfectly with the gun.

Shawn, yes Sir. 55 grain through 69 grain would be the optimal range of bullet weights depending on the application you need it for.

Shawn, This fine firearm will chamber and fire whatever you want in 223/.556 rounds. 55 grain, 62 grain, 75 grain, 77 grain or even the shorter 45 and 50 grain high speed rounds.

With the 1:9 twist in the barrel it will probably shoot 55 grain .223 or 5.56 ammo best.