UTM’s Rifle and Carbine conversions and conversion kits are created and engineered to the upmost in protection, in-support trustworthiness and maintainability. Significant precision cartridge for very long range sniper application. Loaded with Sierra MatchKing bullets, the .223REM HPBT 77gr is designed for use in sniper rifles, along with regular weapons. https://strapweaponshop.com/product/triple-r-munitions-223-5-56-nato-blanks-100-rounds/