Top tips:
1) always assume a spring is going to fly out accross the room
2) work on it on a towel
3) lay everything out as it comes off (either in order that it comes out, or in the shape of the gun in the position it came out of
Thanks- took it out for a shoot today. All seems well. Bit disappointed in the range but not got chronograph to play with. See what its like when delta force have messed with it