when i first got the gun didnt matter what bbs i used it would only shoot 10 -7 -5 bbs at a tme then pull the clip out let the 5 bbs fall out put the clip back in same thing over and over and over Sooooo I took a small screwdiver and at the end supergled a fine 500 grit peice of wet dry sandpaper and polished the inside of the tube were the bbs go in the gun and polished what little bit i could reach and the took a slightly bigger drill bit and bevled ithe inside edge the gun NOW shoots all 100 bbs in the clip in a steel stream of bbs i also swapped the 100 round clip guts into the steel clip that that came with the gun this thing is NOW truly the coolest bb gun ever and you can shoot zinc cooper any bbs no promem out of even the so cslled Precision barral withch neve had anything to do with what kinda bbs u used the prolem of jamming was always caused by were the bbs first enterd the gun that little bit of the releif provided by the bevling fixed it do not change the inside diameter of the pickup tube i just finly polished it
