I have a really similar project in the works but am having terrible trouble getting it to run. Near as we can figure the problem is carrier bounce. The carrier ends up sitting a bit back and soaks up a lot of energy when hit by the hammer. This results in light primer hits and a lot of "click" when it should go "boom"
The extra short buffer tube means the system runs without a buffer and thus without the buffer's anti bounce weights.
Anyone got any suggestions to solve this issue?