metal receiver question
 

I am looking to do another upgrade on my TM SR16 by adding a metal body. I have found a retailer in Canada who has the SR16 receiver i need, and it's made by G&G. Unfortunately I wasn't able to find the information I wanted on this receiver though, does the cocking handle function, fit issues, trademarks and lettering. Has anyone out there used a G&G SR16 M4 metal receiver, and if so what problems did you run into, what was your overall impression of the product?