UCN57 Weight: 6.16 lbs. (2.8 kgs) Magazine Cap.: 300 ~ 350 pcs Usage: Sheathing, Decking, Subflooring, Pallet, Crate & Box Assembly. UCN70 Weight: 7.7 lbs. (3.5 kgs) Magazine Cap.: 250 ~ 300 pcs Usage: Sheathing, Decking, Subflooring, Pallet, Crate & Box Assembly.