Shop › B5 SOPMOD STK MIL-SPEC GRY B5 SOPMOD STK MIL-SPEC GRY $95.00 B5 Systems SOPMOD Stock, Mil Spec, Quick Detach Mount, Gray SOP-1123 Quantity: Add To Cart Added! B5 Systems SOPMOD Stock, Mil Spec, Quick Detach Mount, Gray SOP-1123