VISM Lower Receiver Vice Block AR15. Includes a removable buffer tube mount ring to aid in installing carbine buffer tube straight and plumb onto the receiver. It will hold and lock the carbine buffer tube in place so that the castle nut can be properly tightened without misaligning the buffer tube. Also includes AR15 lower receiver vise block buffer tube support ring with three thumb screws nad pistol grip bolt for securing receiver to the vise block. Specifications for VISM AR15 Lower Receiver Vice Block: Manufacturer: VISM Finish: Anodized Gun Model: AR-15 Gun Make: AR Platform Gun Type: Rifle Fabric/Material: Aluminum Color: Blue Condition: New Package Contents: VISM AR15 Lower Receiver Vice Block Buffer Tube Support Ring With Three Thumb Screws Pistol Grip Bolt For Securing Receiver To The Vise Block What firearm models does the manufacturer say VISM AR15 Lower Receiver Vice Block is compatible with? The manufacturer suggests that VISM AR15 Lower Receiver Vice Block is compatible with AR-15VISM VTARLWRVB: Lower Receiver Vice Block AR15