Modern BB guns usually have a barrel with a bore caliber of 4.5 mm (0.177 in), though many other varieties are available. These guns usually use steel BBs, either zinc- or copper-plated to resist corrosion, that measure 4.3 to 4.4 mm (0.171 to 0.173 in) in diameter and 0.33 to 0.35 g (5.1 to 5.4 gr) in weight.
Copper BB's in my optioning can corrode over time and create a rust like looking dust which can get in your Airgun. Steel BB's will rebound off of hard objects much easier potentially hitting the shooter. BB's do not work well in rifled barrels and can wear down the barrels.
Hot Tags: 4.5mm soft carbon steel shot ball, China, manufacturers, suppliers, factory, wholesale, price, for sale, Steel Shot, Rifle 4 5mm Steel Bbs, Copperhead 4 5mm Copper Coated BBs, Precision 4 5mm Steel BBs
