Quote Originally Posted by SAnd View Post
The HK branded MP5.22 is made by UMAREX. UMAREX is ATI is GSG. I don't know if HK requires a better quality from the maker or if they are the same. The mags aren't the same.
Had no idea. Good information, thanks for the heads up!

I emailed ATI. They said I can ship them the upper and they'll throw it back together for me for a nominal gunsmithing fee.

Appreciate the info!