Shop › LBE .750 GAS BLOCK W/RAIL BLK LBE .750 GAS BLOCK W/RAIL BLK $32.99 LBE Unlimited Gas Block w/Rail, .750 Size, Matte Finish, Black ARRGB-UH Quantity: Add To Cart Added! LBE Unlimited Gas Block w/Rail, .750 Size, Matte Finish, Black ARRGB-UH