The round requires a special M2 Training Bolt that changes the weapon from locked breach gas to straight blowback operation. Once the bolt is installed-—which takes about 30 seconds—-the weapon will work normally in semi- and full automatic operation. It works in standard 20-inch barrels and also in M4 carbines with short barrels. With the standard bolt installed an SRTA round will chamber and fire but the gun won’t cycle or extract.
Winchester Short-Range Training Ammo
The round requires a special M2 Training Bolt that changes the weapon from locked breach gas to straight blowback operation. Once the bolt is installed-—which takes about 30 seconds—-the weapon will work normally in semi- and full automatic operation. It works in standard 20-inch barrels and also in M4 carbines with short barrels. With the standard bolt installed an SRTA round will chamber and fire but the gun won’t cycle or extract.
Winchester Ammunition
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