The Magpul CTR (Compact/Type Restricted), commercial spec model is a drop-in replacement buttstock for AR15/M16 carbines using commercial spec sized receiver extension tubes. Designed for light, fast action, the streamlined A-frame profile avoids snagging and shields the release latch to prevent accidental activation. The CTR also features a supplemental friction lock system that minimizes excessive stock movement for enhanced weapon stability and an ambidextrous QD sling mount that will accept any push-button sling swivel. The commercial spec model includes an extended 0.55 in thick rubber butt pad to provide positive shoulder purchase and accommodates the longer, slanted back common to most commercial spec tubes.