Gun: WA SVI 5" Limited
PRIME metal slide
Guarder springs, hammer and nozzle
History and failures:
Came to me extremely well used, I believe with 134a. The only problem was a worn feed ramp on the loading nozzle, and I replaced the nozzle, as well as the slide and springs.
After approximately one to two cans of propane, the hammer started to develop cracks. It was disintegrated after another can of propane, and was replaced with Guarder's steel hammer. It's probably into it's fifth or sixth can of propane by now, still with no serious problems that weren't caused by me. The blowback chamber is usually loose after a game, even if I loctite the screws, which is a little odd.