I bought my Kit new a few years ago. It didn't come with a manual. I called at the time but one was never sent out. Do the sear trip and counter weight just fit loose around the unit? It looks like the upper reciever just kind of holds everything together. Is that it.
Thanks

The anti-bounce weight floats behind the bolt and above the rail.  It can be pushed in place with the unit together with a bit of fiddling, depressing the firing pin "button", or it can be installed onto the rail at the same time that the bolt goes on.  I find the former easier.

The sear trip stamping is held in place by the pressure of the recoil spring.  Once together, the entire unit goes into the upper and at that point shouldn't come apart.  Good luck!