Registered meaning it would have to be serial numbered and transferred through an FFL.
You would be MANUFACTURING a cartrige firing weapon without a Manufacturers FFL.
AS I said. You might run into some problems with the BATFE.
Or as said. For the money, possible problems, and machining time, just get an Encore and have a barrel made.
And ,.....YOU ,....."Might" post a really coherent report about what .300" means, when doing an "Ex-Spurt" chambering job.
You sure jammed out and split on that one, and left everyone hanging.
What're you ( now that you've flunked basic machining metrology three times ) .....the internet ATF?
The man can do whatever thew hell he wants to , with HIS rifle, as long as he only does it once.
You are turning out to be a REAL disappointment, young man.
Mouthy, .....never expected that, back when you were in the bowl turning stage.
Clean up yer' act
GTC