Remixed the Stribog backplate adapters to create one that actually fits a standard mil-spec buffer threads (1-3/16 - 16tpi). Not sure on strength as I haven't tested it "in action" yet, but seems quite strong and shouldn't have to worry about side loading as the buffer is designed to be in line with the BCG. Should fit A1, A2 & A3 Stribogs.

I'd recommend printing on "fine" settings (.10 or .08 layer height) to ensure the threads are formed properly.