Engraved Mateba
Prototype C-96's with interchangeable barrels
A guy paid money and went through the NFA process in order to mutilate a crusty Vetterli
I think I might have stumbled upon the original photo that inspired all the Ruger Standard/NT-4 builds I've disproportionately seen over the years.
Rare 12.5in KAC SR-25 DAC (Direct Action Carbine) with SR-25 sized FF RAS-5 (same style of rail used on USSS SR-16's)

Here's a video on it from some permacrippled guy (seriously his arm has been in that sling for fucking years)
M9 with the special KAC slide lock suppressor
Geissele has in limited numbers made MK16 rails that can direct mount M320's
Internals of the "Ounce" folding .22 pistol
canadian company Lockhart Tactical had at least at one point a plan for a .22 belt fed upper for their proprietary Raven-9 rifle, I cannot find a single image of it that isn't a rendering.
An even more than usual abominable Hi-point
Molested Mossberg 385
An equally molested Ruger American Ranch
Hi-point carbine rebuilt with a metal upper among other things
You ever seen 3000 AR auto sears before
Mock up of a Digital FCS system for AK-12's meant to integrate with the prototype GPR-20
Lastly we have a rendering for a new Sureshot Armament Concept rifle. Stamped instead of milled receiver, uses a non standard bolt
ATF Dummies are rolling out a new Illegal MG reporting and data collection service but because they're stupid they're referring to AK DIAS's as Super Safeties despite showing a DIAS (as confirmed by the dev who designed it, S3igu2) in their reference photo
Starting at 4:25 you can get a good look at a new style of barrel from Outlier Precision, which is some kind of sister company for Arken Optics
Essentially it's a sleeve around the barrel that adds what is essentially the entire length of the barrel (as it is the same as the length of the sleeve) as a massive reflex expansion chamber for suppressors. I see no reason why this couldn't be done with those absolutely massive "Structured Barrels" I brought up a few posts ago.
Hodge has a prototype "Unitized"/Pseudo monolithic upper
Icon Defense, Formerly Mega Arms, who lost a court battle to LMT 11 years ago leaving LMT king of Monolithic Hill, are looking to make a comeback into the market by also bringing a Monolithic upper to market