Issue with my wal-mart special

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     First off i would like to appologize for asking a question about a non-tippmann gun but i've read alot of posts on this forum and there seems to be alot of people who know alot of stuff and i need some help bad. 
  At the very dawning of my paintball career, my friend and I each purchased a Triton Veiwloader V2 from walmart.  These walmart specials saw us through a few years of paintballing before I wisened up and upgraded to a Tippmann 98.  I use my Tippmann and give my special to friends that don't have a gun when we play.  The issue is now it has decided to start chopping every other paintball it shoots... and thats no exaggeration... i counted... I want my friends to have a good time out paintballing to try to have them get their own markers and its no fun playing with "The Ax"(thats what we call it) so in order for them to have a good time they end up with my tippmann and i get the ax...  
   I have tried almost everything i can think of to stop the chop but nothing works... I have replaced all the O-rings, lubed things up, tried to run things with out the lube, raised the velocity, and lowered the velocity.  I have had that thing apart so many times i could do it in my sleep and i still have no idea what is wrong. lowering the velocity helped a little bit but when it gets low enough to make a noticable difference the bolt doesn't go back far enough to lock in place so i get that wonderful out of air expeirence... 
   Does anyone have any idea what could be the problem or should i just toss the special and not try anymore?

P.S. my friends gun still works perfectly