The Presma AAST23 is a collapsible SOPMOD-style AR-15 carbine buttstock for mil-spec receiver extensions. It is built from high-strength polymer, adjusts for length of pull, and adds a slim rubber recoil pad plus onboard storage. The adjustable latch lets you set length of pull to suit your build, body armor or shooting position. The two removable storage compartments hold small items such as spare batteries for an optic or light. The collapsible design keeps the rifle compact for storage and transport, then extends to a full length of pull when you shoulder it. The slim recoil pad adds grip against the shoulder without adding much length, so the stock keeps its compact profile. Features: SOPMOD-style collapsible carbine stock High-strength polymer construction Slim rubber recoil pad Two removable storage compartments Adjustable latch for length of pull Fitment: Fits MIL-SPEC carbine receiver extensions only, not commercial-diameter tubes. Measure your buffer tube before ordering. The buffer tube is sold separately.