TK slide spacer is NOT required! It's only required if you are installing a Hi-Capa slide in to a Marui 1911... which it doesn't sound like you are.
Even if you tried installing the spacer, you couldn't. The space where it's suppose to be installed doesn't exist on a Hi-Capa. It's for 1911 only!
Many aftermarket slides (notably PGC and Shooters Design) are manufactured to tighter tolerances than stock Marui. Mix that in with some loosely toleranced die-casted blow back units and die-casted rear sights and you'll start to run in to problems. I've had my fair share of modding to get blowback units to fit.
First thing to do is to try installing the blowback unit without the rear sight installed. This is almost always the problem. If you experience a clean and flush mount without the rear sight installed, then you've localized your problem and it almost always has to do with that circular "nub" on the bottom of the sight base. Easiest solution is to just grind the entire thing off, although with more care, you can localize the issue further.
Regarding the loading nozzle, are you able to slide it back and forth (no spring installed) with ease?
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