The Magpul CTR is a drop-in replacement collapsible buttstock for AR15/M16 carbines using mil-spec sized receiver extension tubes. The popular CTR reinforced polymer A-frame design is simple, lightweight and rugged. A shielded operation lever and supplemental friction locking system prevent accidental operation and minimize excessive stock movement for enhanced weapon stability and accuracy and a no movement fit. The CTR incorporates two integral sling loops, a reversible push-button QD sling mount, and a replaceable 0.30�� rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or other field gear.