The Delta 556 contains no chambers so gas is expelled more forward which reduces the concussion to the shooter although recoil mitigation will feel similar to that of an A2 birdcage.
WEIGHT 0.16 lbs
MATERIAL 17-4ph® Heat Treated Stainless Steel
FINISH BLACKNITRIDE™ – Satin Finish (Half Gloss)
SURFACE HARDNESS 68RC
CALIBER 5.56mm/.223 Rem Only
THREAD 1/2×28 RH