Mk 12 Gas Block .750 (Commercial) Centerfire Rifle Ammunition No more changing sights from

No more changing sights from night to day patrols

Discreet Cases

Manufacture ID: Q4196

- Twist-up Eyecups

Mk 12 Gas Block .750 (Commercial) Centerfire Rifle Ammunition No more changing sights fromMk 12 Gas Block . 750 (Commercial) Manufacture ID: 25 081 00029 The MK12 Gas Block is only compatible with the RIS II (M4A1 & MK18) family of rail systems manufactured by Daniel Defense. It is not compatible with any other Daniel Defense rail system. This is due to various clearance issues. This only applies to rail system lengths that would completely shroud the gas block. If you are mounting the gas block to the barrel without being shrouded by the