Theoretically do-able,......
totally impractical, in choice of platform
What, pray tell keeps the "Adaptor" from getting flung out on the ground, as you cycle the action as a "single Shot" ?..remove the regular extractor?
What keeps it from "flinging out" is that it is an entirely new bolt assembly, that replaces the normal bolt carrier group, modified to take the 22 LR.
The only way to get it out is the conventional way; pivot open the upper and lower, pull the charging handle back, and slide it out of the back of the upper.
Totally do-able, and practical.
I've put tens of thousands of rounds through them. Kept clean, they run fine.
