Forgotten weapons is covering Rock Island Auction again and this pistol has an interesting concept. As noted, it is a prototype. As the bullet is fired, barrel (shroud) moves forward and then back as the bolt is getting pushed by the barrel.
It also has a feature that releases magazine after the last round.
https://www.youtube.com/watch?v=cVQs4YGm_XE
From: Forgotten Weapons
