AIM Sports Inc AR M4 Stock Locking Pin Black Small. This device is compatible with USGI M4 B5 LMT SOPMOD VLTOR BCM Blackhawk and LWRC Stocks. Specifications for AIM Sports Inc AR M4 Stock Locking Pin: Manufacturer: AIM Sports Inc Color: Black Additional Features: For Featureless Conversions Gun Model: M4 Condition: New Fabric/Material: Steel Finish: Matte Size: Matte Gun Type: Rifle Features of AIM Sports Inc AR M4 Stock Locking Pin All Steel Construction Package Contents: AIM Sports Inc AR M4 Stock Locking Pin What firearm models does the manufacturer say AIM Sports Inc AR M4 Stock Locking Pin is compatible with? The manufacturer suggests that AIM Sports Inc AR M4 Stock Locking Pin is compatible with M4AIM Sports Inc PJARSTKCP-B: AR M4 Stock Locking Pin Black Small