Quiet Shots, Quieter Strikes (as long as you only slash, the worst kind of wounding mechanism for small knives)
Said to be the world's first and only left handed M14 from the 2018 SHOT Show
Ukrainian Militant with Civilian QBZ-97 during the very early stages of the SMO
You've seen Americans with Carry handles on the 3' and 9'o'clock positions on their quad rails, but have you seen Georgians with them strapped to their stocks? (both cases are for retention of the carry handles in case of optic failure, BUIS are an advanced concept)
Syrian Al Qaeda sniper with an Absurd Chassis'd Mosin

The Black Lotus Coalition Dev AG Off Grid (tranny) has developed a variant of his Gremlin .22 pistol that is mocked up as a Hot Glue Gun. Sounds a little Illegal to me even if it follows the law to the letter

Years ago I wrote a very short post about him in the Tranch Thread (Never Forget the victims of the Alpacacaust)
Off topic but I actually know a little bit about this tranny.
Very poor quality, but VSK-94 with very rickety folding stock (retained by string), non factory suppessor (tubular object behind the scope) and thermal scope recovered in Chechnya.
Norinco QX-04 slide and barrel, the barrel is fluted in the opposite direction of the rifling and exerts opposite rotational force until the bullet leaves the barrel
BEEEG Box

Bullpup Vepr rifle (not the Ukrainian AK Conversion, but a version of the Russian civilian hunting rifle)
Anti-Russian Hitman Timur Makhauri after being detained by Kiev Police. Wearing what looks like a bullet proof vest with two pistols stuffed into it. Glock and Stetchkin with Gold(?) or Brass(?) Hammer. He would eventually be killed in a car bombing

You can learn more about him in this WSJ article
Experimental AK-107 variant with a rail over the counterweight housing and BUIS
Full size version of the AM-17
Sureshot MK.3 Slim (requires removal of the front sling mount) Chassis somewhere in Africa
Lastly we have a video from the Chronically backlogged AGCast regarding the newish developments in the GunCAD World. Highlights include DIY Buffer springs, Gas Tubes, Gas Blocks and even a new Wildcat Cartridge,
WARNING: Terminal Weebery contained inside