The M249 Saw Air-Thru Stock Kit balances perfectly and rolls firmly onto its target like a tried-and-true saw stock rifle. It features an over-molded (integrated) high-pressure air line, and a retractable "flip-up" support brace and ridged buttplate. It also includes a saw stock, an A2 standard foregrip, and a stainless steel braided air line and ASA fitting.