I also found that my TM Precision Chamber had a hard time hopping .30's, even then they weren't reaching their maximum potential. I noticed that the "fangs" weren't as long as the ones on my stock JG arm. I replaced the arm, and got a bit more hopup.WolfBattleCry said:I was inside my VSR's hop-up chamber today trying to add some aluminum foil shims(TM precision unit, if that makes a difference), noticed the little divot in the hop-up arm, and recall thinking to myself "huh... You could probably fit an AEG hop-up nub pretty snugly in there...".
I've also noticed that the rifle doesn't seem to hop heavier BBs too well (I stick to .28s and .3s mostly as a result), so I'm very curious to see what results you get with the addition of a nub. Currently, I have to go back in and take out the shims anyway, as I did something wrong and now my shots are curving right. :