If the gas system is fine, I can only guess there’s some difference in the recoil spring. I used three brands of.223 Rem. ammunition: American Eagle.
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One disappointment with the RB22 is that there’s enough difference in the upper-receiver. It likes almost every ammo I’ve tried in it; including cci stingers,
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Newly manufactured Tula 223 Rem 55 grain full metal jacket ammunition In Stock
A variety of.223 Remington cartridges and a.308 Winchester (right) for comparison. Bullets in.223 cartridges (left to right): Montana Gold 55 grain Full Metal.
500 Round Tin for Storing 223 Rem Ammo – Tula 223 Rem 55 grain full metal jacket ammunition In Stock