Went to put on the GSG 5/522 kit today.
Called Dlask to see about how the 9mm to 1/2-28 adapter was attached, Joe assured me it was not loctited on but only hand tight. In my case it definitely was loctited on and I had to use a heat gun and channel locks to get it to budge. It took considerable force to remove the adapter - once removed I had to chuck it in my lathe and skim a few thou to get some plier marks off it. Cold blued it afterwards, looks just fine. The remnants of the blue loctite was left on the threads and I cleaned it off and once re-installed with no thread locker it went on hand tight with no issues to remove now.
Also noted when trying to remove the bolt assembly that two of the (three) side screws holding the body together were slightly overtightened - this would not allow the bolt to come out of the upper once the bolt stop was removed. About an eight of a turn or less on each screw and it was free. This may have been why there were some feeding issues with the one particular type of ammo, but I won't get to the range again until next week to test.
Waiting on a forward handguard and fixed stock to show up from Hong Kong.
As I mentioned above, this is a really fun rifle and the look of it with the 9" barrel is awesome.