That's disappointing. I had an idea for using a sliding baffle as a blowback *eliminator* for a non-blowback-operated design
I've been trying to figure out a way to reduce or eliminate springs in the slide and firing mechanism, so I can actuate it all electrically without wasting a lot of power and carrying around huge solenoids.
The design's based on a PS-90 barrel, with the action built in front of the breech face (along both sides of the barrel). With electrical actuation, the trigger doesn't have to be mechanically connected to the action - it'll mean the butt of the rifle won't have to be any further back than the magazine's edge. With a folding stock, you could get a rifle with the same length as the minimum barrel length in WA (plus 30mm or so). If you went to a state that allowed SBR, you could have one heck of a compact 5.7x28 rifle.
Plus, it'd mean you could leave the chamber open and unloaded until the trigger's pulled, *seriously* improving barrel cooling. It'd pull the chamber closed, scooping a round out of the magazine. As it finished closing, it'd lock into grooves which would simultaneously rotate the firing pin into alignment and release it.
I think it wouldn't be too difficult to have a laser diode mounted in such a way that, when the firing pin's rotated out of the way, the laser diode shines straight through the barrel, giving you all the benefits of a bore sight (and eliminating the huge parallax problems that a normal PS-90 sight has)
Also, the firing cycle'd be controlled in software - meaning the only difference between semi-auto and full-auto is a couple lines of code. Adding a round counter would also be just a couple more lines of code and an LED display.