This block allows the user to work on and install parts to AR-15/M16 lower receivers. The block slips into the rifle’s magazine well and is held in place by the rifle’s magazine catch. It is constructed of black injection molded polymer. Made in the USA.
Bravo Company USA BCM Complete Lower Receiver Multi Caliber Flat Dark Earth
$480.36 
ProMag PM245 Lower Receiver Vise Block Polymer 308 Win/7.62x51mm NATO Armalite,DPMS,Remington,SR-25 AR-10
$13.61
ProMag PM123 Lower Receiver Vise Block Black Polymer Rifle AR-15/M16
$10.39
