Features internal tensioners, ambidextrous fixed and quick disconnect sling mounts, gross length of pull adjustment via pull down with lockout, underside M-LOK® accessory mount, and color matched hardware. The CPS Medium fully collapsed will clear the M4 charging handle. Cheekpiece Clears AR-15 Charging Handle When Fully Collapsed Adjustable Cheek Weld and Buttpad with Precision Dials and 10 Internal TensionersColor Matched Steel HardwareGross Adjustment Pull Down Lever with Lockout FeatureFixed Sling Mounts and Steel Anti-rotational QD MountsCushioned Non-Slip ButtpadMounting Slots for Accessory CheekpieceUnderside M-LOK® Accessory AttachmentsMade of MIL-SPEC Materials and FinishesFits MIL-SPEC Carbine Receiver Extensions (M4/A5/M110K)Available in All Standard Colors