I will continue polishing tonight. Per my experience with the P07, I'll go after the rear of the TB, roller, etc. the hardest, but likely also work on the frame with 1500-2000 paper. My experience with rollers is to polish the stock one - otherwise you can induce MORE stacking - unless of course the original is wrong. The parts in the P01 look MUCH more precise. I may try to use this gun as is, but polished before going CGW on it, just to see what is possible. No gun should come with a trigger this bad. When I compare it to a P229 ECC, it is a total fail. It is amazing what CZ UB turns out. But, I like the shape, form and function, so I add the P01. Guess I am too biased.