Leapers UTG Blank Firing Adapter for AR15/M16 FeaturesCompatible with 11.5" - 16" M4 Carbine and AR15 Equipped with A1/A2 Flash SuppressorFits Standard A2 Flash Hider and BarrelDurable Reinforced Steel Construction Finished in High Visibility YellowField and Torture Tested to Meet Most Demanding Requirements and Deliver Best PerformanceHighest Quality, Most Coveted Part for Law Enforcement/Military TrainingNot for Use on Rifles with 20" A2 Length BarrelsWARNING: Blank firing adaptor use with blank fire ammunition Only. Before installation, make sure the weapon is cleared. Do not use any tool to over-tighten the BFA. HAND TIGHTEN ONLY. Never fire at anyone within 20 feet. After every 30 to 50 rounds depending on your mag capacity, check if the BFA is still securely tightened. Clean the carbon buildup on the BFA after each use.