The UAS-AKMS P Folding Butt Stock w/ Cheek Piece (Polymer Joint) offers you a supreme tactical upgrade for your AKMS (under-folder).Advantages: Tough and robust design, slim and low profile Imbedded adjustable cheek piece Provides optimal eye to target alignment Permits appropriate trigger access when in folded position Integrated quick detach sling swivel connectors on both sides Rubber butt pad enhances tactical performance and reduce recoil Locking is released by the push of a button Spring lock on folded position Opens by a simple pulling motion and locks Left folding stock by default May be configured to fold left or right (please designate your preference during purchase)Compatibility: AKMS (under-folder) Stamped Receiver Variants.