M16-AR15 Upper Receiver Assembly Vise Block
Constructed of T6 6061 Aluminum, hard coated black anodized. With 2 locator pins and 1 thumbscrew for locking the rail into the block.

Grip this handy block in a bench vice and hold the upper receiver by the lugs or by the receiver rail. It leaves the entire upper receiver accessible to work on sight systems or clean the bore.