OK...Here's my thoughts... It's a rough drawing that I put down on paper as it came to me (though I did go out and lay all of the parts out on my templates to make sure this should work.) NOTE: Not to scale....

You would also need to mill the feed lips on the bolt and drill a hole for pinning the firing pin.

Here's my logic as to why this would be a legal design...

1. Even though you could get an original F/A bolt into the receiver, there would be nothing in the lower to make it work.
2. The lower, with the modifications for the SKS trigger group, would not allow the original F/A fire control group to be installed.

Why I think this would be a good working design...

1. No tricky slide hammers
2. No special small diameter springs to compress/ fail
3. Proven reliable SKS trigger group
4. Solid Sten/AR spring
5. Bolt will be the same length as the original for good travel and function with the spring.
6. Modified Bolt will be the tried and true Beretta bolt on the business end.

Custom "Lowers" for this design will be available from us.

Note: I will replace this hand drawing with AutoCad drawings later this week.