Featuring a proprietary bolt carrier system (included) and a heavy-duty latch assembly, the Troy Industries AR-15 PDW Stock Kit is rugged, reliable, and built to last. A simple, lever-actuated 6-position design delivers fluid adjustments and allows you to customize the length of pull to fit your needs, while built-in sling swivels readily accept your favorite single-point sling for convenient, hands-free carry. The design of the rods in the Troy PDW stock allows full access to the AR-15 rifle's charging handle and operating controls, even with gloved hands or when the stock is completely retracted. This stock is compatible with most DI AR-15 platforms ONLY (will NOT work with piston-driven systems) and the bolt carrier group is full-auto-capable. Includes PDW stock, spring, complete bolt carrier group, and buffer system for reliable service right out of the box.