PROMAG AR-15 Lower Receiver Vise BlockBlack Polymer, ReversableAR15/M16 Low Receiver Magazine Vise Block - Manufacture ID: PM123 This
block allows the user to work on and install parts to AR-15 / M16 lower
receivers. The vise block is locked into the users vise. The block
slips into the rifle's magazine well and is held in place by the
rifle's magazine catch. Constructed of black injection molded polymer.
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5.0