Hybrid case accurized 14.5x114mm from ukr company Horizon Lord
Sig Hybrid cases converted to .308, 6.5 Creed and .358 Winchester
Said to be an image of a German WW2 Era HE 12 Gauge projectile, apparently there's a SAR Article my Michael Heidler covering it but I can't find it when searching SAR's site
Shell Shock Technologies NAS3 cases for .338 Lap and 7.62/6.5 creed. I'm no cartridge engineer but that's a hell of an extractor groove
DeLisle style prototype carbine made by Maxwell Atchisson
Polish kbk wz, 2002 BIN

The Above design would serve as the basis for the following
Karabinek wz. 2005 Jantar
And the Jantar-M
The MBAR guy is working more in his PDW design, supported cartridges are 5.7, 9 and 45 from Ruger and Glock mags respectively. Uses the same striker fired mechanism as his MBAR
Some of you may be familiar with the Surefire OBC, which features a longer stroke length due to it's proprietary gas key design. Many of you may however be unaware that surefire once had a version of the OBC called the AROC (Advanced Rifle Operating Core) that incorporated a proprietary bolt with lugs that were 30% longer than milspec. When KAC has the patent on rounded lugs and LMT has the patent on stress relieved lugs I guess you go long.
Idlib Jihadi with an M&P57
AR-7 with haga defense parts
Jeet wit da VSS
ArmWest MG-10, would go on to become the Surefire MGX
@Club Sandwich
I'm tagging you because you'd be the person most likely to know anything
In this 2009 New Yorker article all about the AA-12 and militarized robots there is the following sentence
"The smaller robot had wheels, and its turret gripped a semi-automatic version of an M-16 rifle, which Baber had re-engineered so that it, too, fired without recoil."
The Baber mentioned is Jerry Baber, who bought the design of the original Atchisson automatic shotgun design and reenginered it into what we now know today as the AA-12. My question is, do you or anyone else have any idea what could he have done to that rifle, My assumption was that he played with the buffer and slapped a huge muzzle brake on. But there's a small possibility he incorporated some of the tech in the AA-12.