300 BLK - Frontier 208GR FMJ - 20 Rounds Rifle Cases 812 gas block and a

812 gas block and a significantly thicker Super HBAR straight gas tube

223 Remington platforms THE 30-ROUND AR STANDARD 30-round reliability with no stoppages

helping users keep a vertical spine

450 Bushmaster chambered rifles use a proprietary single-column detachable box magazine and are not compatible

300 BLK - Frontier 208GR FMJ - 20 Rounds Rifle Cases 812 gas block and aAmerican made and built on tradition these are the hallmarks of Frontier Cartridge. State of the industry loading techniques and quality control procedures ensure the reliability of every Frontier Cartridge round. Features : Brass Case Full Metal Jacket 208 Grain Subsonic