Tanio Koba has added the shots of their previously mentioned upgrade slides (EEX-844) for the TM Hi Cap 5.1 GBB to their webpages. There’s two different types available, one 5.1 inch and one 6 inch (the top slide in the photo fo three has been polished apparently), all marked with “Springfield Armoury” (no.. not where Bart and Lisa live ). Price wise you’re looking at 11,000Yen for the 5.1in slide, and 25,000Yen for the 6in.
Both of these slides are being manufactured for a trial period at the moment, so if you see them at your local stockist, you’ll have to move fast as there may well not be more in the future. From what I see they are only going to be advertised on the internet by Tanio Koba. Difficulties in production are listed as possible reasons for the limited run.
There’s also a selection of complete pistols available, which will most likely be even more difficult to source for Western customers, however they do give you an idea of what the 5.1 looks like with the sldie fitted.