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).