Air-in-Stock Guide Rail (Screw-attach version) for 5oz/7oz/13ci/17ci

Air Buttstock Guide Pin \ Rod \ Rail Version A has 2 screws attach on to your air adapter.  Works with:  GEN1, 2, 3, 4, 5, 6 T68 Flex-air Adapter
Two M4x6 screws included for attachment.
Not for buffer type style CO2 canisters, this is for 5oz/7oz/13ci/17ci tanks, large diameter tanks.