The only issue I have found with my Crossman 102 has been a old cork washer that goes between the stock and receiver. It was old and no longer performing as it should. I noticed my stock was slightly canted to one side because the washer was no longer doing its job. (Info from Mr. Fletcher on a old post on another site) Also when pumping, the stock could rotate and not stay in alinement. I found online where a guy had made a cork replacement but I had just bought a lot of scrap leather to make seals and I thought leather actually might work well. Made a two piece gasket, one perfectly fit into the receiver space, the other matched the profile of the stock. Glued them together with E6000 glue. Made a great buffer that I think may work better than the cork factory ones. Could thin it further like they did the cork ones but may just dye it a more matching brown. Took pic now cause its easy too see it as is. I have been amazed how accurate these guns are, and the peep site has given my cataract lens replaced eyes a new lease on life.
http://i168.photobucket.com/albums/u...pswoendii9.jpg
Here is grouping from last night indoors, 20 ft?, the one on the left is not a flyer but a .177 pellet from another pistol. I really wasn't trying that hard, the peep site is very intuitive.
http://i168.photobucket.com/albums/u...ps7hnjpxxa.jpg