FYI we just got in the long awaited HK/Umarex MP5 A5 .22 Rifles & here are few pics.
Thanks for the info. Do you think the fake 3-lug (half a 3-lug) can be removed, the barrel cut and crowned, and a real 3-lug threaded on? It was really easy SBR'ing the GSG-5 carbine -- just buy a pistol barrel and a slip on 3-lug adapter. I am wondering how difficult it would be to SBR the Umarex.The fake suppressor unscrews with help of a tool that is included in the nice padded Walther-marked hard case it comes with. The 3-lug is, well, not really a full 3-lug; when removing the fake suppressor off, what you see for the 3-lug is just about it...really about a half of a three lug.