FYI.. that chopping issue is because the ball rolls back a little bit in the breach if you look at the bolt where it sits in the breach its a good 1/8th of an inch back behind the feed neck opening.
Quick and easy fix if you pick up a cure bolt.
And just for good merit.. my 1 of 5 made for Buffalo NPPL Leopard Etek 2
Only upgrades I put into it is a cure bolt and a zick kit.. the gun is a beast and shoot just as good as my 07 ego except its slightly less air efficient.