Well I know that alot of you have found out the old mags will not work in the new t8.1. Well the reason is the thickness of the barrel. So if you are wanting to use your old mags in the new marker, well here we go.
Well as everyone knows, the new mag verse the old, is the dip on the top of the mag.
Well the valley on the t8.1 is .5 inchs with the max depth in the center being .006 inchs.
So take a file or dremal or even a air grinder and start in the center of the mag as shown.
Take your time and make sure that you do both the front and the rear equally.
As you see, they now both look the same.
I have done this to all 7 mag and they fire perfectly out of the 8.1. But let it be known, THIS MOD WILL NOT FIRE FS ROUND. It will fire out of your t8.1 with .68 paintball only.