Got this for the kids that have recently gained interest in airsoft this is perfect for a cheap beginner gun to show your kids safety and handling and teach them all the need to knows before buying them a more expensive one. Plus when you put this in a picture next to my FTE apx they look similar said my boys lol.

I purchased this item as a blue gun for dryfire training (the BBs and slide rack function were not a priority for me). I can speak to a few features of this product: the backstrap can in fact be replaced for a real Walther PPQ backstrap of any size. The mag release and slide release are all-metal, though the latter is not ambi. The picatinny rail works as intended if you're running a WML.
The only two downsides to this product are its lack of heft and perceived durability, but perhaps this is industry-wide nowadays. The plastic of this product is noticeably lighter and thinner than early-2000s airsoft Walthers, and the metal weights were only placed in the backstrap (not in the magazine or frame, unfortunately).