Fits zenith zf-56...sorta - SB Tactical SBT5K Pistol Stabilizing Brace for MP5K/SP89/SP5K

First off, this is a really nice brace. I expected as much after ordering one of these for the standard MP5 (used on a ZF-5). I ordered this for a ZF-56 as it is designed to take MP5K style stocks/braces. It does fit, but was EXTREMELY tight. So much so that it was difficult to remove. A little work with the Dremel on the inside pieces of the brace and it fits perfectly. Still tight and unmoving as it should be, but can be easily removed for cleaning and such. Only issue is that, since the ZF-56 does not have MP5 style iron sights, any optic mounting is a bit high. Not that big a deal since I slapped a red dot on it. Just something to note.