Sharps Bros. Heatseeker Chassis, Fits Ruger American Ranch (Models that Utilize AR Type Magazines in 223, 300 Blackout, 350 Legend, 6.5 Grendel and 450 Bushmaster), Black SBC05 Heatseeker is an innovative" affordable chassis system for your bolt action rifle" allowing you to easily upgrade a traditional factory rifle stock for improved versatility and a sleek" modern appearance. This 1lb" 3-ounce chassis is machined from billet (solid block) high-strength 6061-T6 aluminum and includes a 10-ounce" 14" handguard cut from a unique extrusion shape exclusive to Sharps Bros. This offering is for the AR magazine fed Ruger American Ranch models (calibers: 223" 300 Blackout" 350 Legend" 6.5 Grendel and 450 Bushmaster).