UTM’s Rifle and Carbine conversions and conversion kits are developed and engineered to the upmost in security, in-services reliability and maintainability. Higher precision cartridge for extended variety sniper application. Loaded with Sierra MatchKing bullets, the .223REM HPBT 77gr is suitable for use in sniper rifles, as well as standard weapons. https://strapweaponshop.com/product/triple-r-munitions-223-5-56-nato-blanks-100-rounds/