MagBlock AR-15 Magazine Well Seal with Storage Compartment, Black

MagBlock
696859020292
M-203 BLACK
GNS-230
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MagBlock was created for military and LE personnel to seal the magazine well and assist in keeping their AR-15 rifle clean. In addition, this MagBlock seal works as a safety device that prevents the bolt assembly or firing pin from engaging the firing chamber. Inside the MagBlock is a storage compartment for parts or other small gear.

Fits:
AR-15
M4
M16
M-203