I would like to thank Invasian for giving me the opportunity to build his gun and so I thought I would post a quick write up of the work done for people thinking of taking this project on themselves.
On the Detonator Tokyo Marui M&P Slide:
It is indeed a drop on fit with tight tolerances between the slide and frame rails. The CNC work detonator's does is flawless with no tooling or machine marks to speak of. The anodizing is smooth and a consistent color throughout. One surprising and really neat feature is the separate extractor moves to emulate a loaded chamber when in battery. The barrel fit is loose and rattles around a bit when the slide is forward but I believe this to be a positive as the slides movement is arrested by the hop-up chamber and not the aluminum barrel, therefore prolonging barrel life.
On the Tokyo Marui M&P itself:
TM never fails to impress and definitely deserve there reputation for making a great product. The hammer and firing pin are chrome plated and when filing them smooth I did notice they feel like they are made of a harder material than the other cast parts in the gun.
Work done:
I tried to polish surfaces smooth without removing too much material to get a tight frame to slide fit that glides like its on ice. I polished the underside of the blowback unit, the top and sides of the internal frame rails and the casting flash on the hammer. I then resembled it and cycled it by hand a bunch of times to mate the surfaces to one-another. Finally I cut a rubber recoil buffer and put it on the guide rod to prolong the life of the internal frame rails because the force of the slide slamming rearward was marring my fresh polishing job and would have worn the frame rails out prematurely due to the immense kick the blowback unit puts out.
It is now a bespoke hand fitted gun that is very light and kicks like its running on Co2.
**No slides were harmed in the making of this gun!**