AIM Sports Inc AR Upper/Lower Receiver Vice Block Set Black Medium. This Receiver Vise Blocks & Reaction Rods from AIM Sports Inc is made of solvent-resistant polymer construction and the lower receiver fits into magazine housing from either top or bottom. The AIM Sports AR Upper/Lower Polymer Vise Block Kit features a magazine catch that securely locks the receiver to the block and will not crush distort mar or damage the receiver. The AIM Sports Inc AR Upper & Lower Vise Block Set is excellent for cleaning repair service or assembly of a weapon. Specifications for AIM Sports Inc AR Upper/Lower Receiver Vice Block Set: Manufacturer: AIM Sports Inc Condition: New Features of AIM Sports Inc AR Upper/Lower Receiver Vice Block Set Allows safe mounting of the lower receiver into a vise Perfect for cleaning service or weapon assembly Will not crush distort mar or damage the receiver Solvent resistant polymer construction Lower receiver fits into magazine housing from either top or bottom Magazine catch securely locks the receiver to the block Package Contents: AIM Sports Inc AR Upper/Lower Receiver Vice Block Set Delta Ring wrench to aid in the removal and installation of standard two-piece drop-in handguards AIM Sports Inc ATVBS: AR Upper/Lower Receiver Vice Block Set Black Medium