NcStar Lower Receiver Vise Block Features The NcStar Lower Receiver Vise Block mounts a mil-spec AR-15 lower receiver directly to a bench vise using a pistol grip bolt holding the receiver firmly in place for detailed work like trigger group installation or pin removal. This stability prevents the receiver from shifting mid-task which reduces the risk of marring the finish or misaligning parts during assembly. The block is machined from aluminum and anodized in a bright blue finish that stands out clearly on a cluttered workbench. Its design accommodates the common maintenance tasks builders face when assembling or servicing an AR-15 lower. Included with the vise block is a removable buffer tube support ring secured by three thumb screws which helps install a carbine buffer tube straight and plumb onto the receiver. This ring holds and locks the buffer tube in place so the castle nut can be tightened properly without misaligning the tube during installation. Having a dedicated fixture like this speeds up builds and reduces the chance of a crooked buffer tube installation a common frustration for first-time builders. For anyone regularly assembling or servicing AR-15 lowers this vise block is a practical addition to the workbench. NC Star AR-15 Lower Receiver Vise Block Specifications Brand: NcStar Model: AR-15 Lower Receiver Vise Block Type: Vise Block Color: Blue Material: Aluminum Finish: Anodized Compatible Hosts: AR-15 Included Accessories: Buffer Tube Support Ring Pistol Grip Bolt Available At: GrabAGun