I think you'd struggle to prove that part. But that's entirely the opinion of a non-lawyer so I'll just leave that as is. I just don't want new players coming on to this forum who've not played yet and believing it's perfectly ok to buy a 2-tone when they're not eligible to be sold a RIF then manufacture a RIF via paint that same day. Forums have way more lurkers than they do posters.
Well if you have a GBBR or a TM recoil it will release the bolt to load the next mag that has been inserted.
I can see the reason that this would be good as with my Daytona gun I have to release the bolt with every fresh mag, this would make reloads very smooth.