Bit late but I had received my tactical kit. Excellent quality but that's what comes with the price when it comes to Detonator stuff.
I emailed boomarms and it seems the reason tactical kits aren't being stocked is because all the Japan shops bought them already and they were a limited run. Ordering directly from Japan set me back around 310 dollars but the addition a front and rear sight to the package offset the cost by a bit in my mind.
The slide stop insert is of great quality steel and is secured via 2 screws instead of being held in place by the BBU like in the stock marui. Of course, the parts are not interchangeable and the Detonator piece is of a different shape as well.
I think the Meprolight sights have a very cool look especially with the swept forward rear that allows for one handed slide manipulations. Unlike the real Meprolights they are only fiber and do not contain tritium. Since the HK45 is compatible with real front sights, I plan to buy a real Meprolight front sight sometime.
Around ambient room lighting for around 5 minutes:
After shining under a bright light for around 10 seconds:
The outer barrel is 14mm clockwise not anti. The cocking indicator sticks out when the slide is in battery and retracts when the slide moves back. However, unlike in the store pictures the extractor/cocking indicator slot is not painted red so you'll have to do it yourself