It could be the BB diameter that's making it jam in the barrel. Are you using seamless BB's? EDIT: That was two thoughts. If the BB diameter is too wide or if the BB's have seams. One will make it jam, the other may make it jam but will most likely chew up the inner barrel.
I had this problem with one of my own guns the solution was to just switch Bb brands (I ended up using Madbull, BB Bastard, and Metal Techs exclusively). Theoretically though, your gun shouldn't be "that" finicky for certain brands of BB's.
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Last edited by L473ncy; May 17th, 2009 at 20:46..