Pathfinder .22 open bolt with folding grip
Pull and release zipgun using shotgun chamber adapters as barrels
MP5 with what may or may not be an unreleased KAC 9mm suppressor
Remix of the SFFA V3 DIAS from Dev S3, requires no rollpin or spring at the cost of massively reduced durability, only good for about 400 rounds.
Two SVU's and an SR-3
Kalashnikov SR-1 (civilian AK-108 that accepts AR mags) with Hexagon Tactical furniture and a Surefire 100rnd Quad stack
Archon Type B with rail mounted comp from Rain6 LLC
8'' HK P9S in .45 ACP
The makers of the "Scorpion" Ammunition backpack for PK pattern machineguns has a relatively new product that has seen no press attention, Polymer machinegun belt links. Previously a Ukrainian firm, the Kharkov Plant for Personal Protective Equipment designed and brought to market a similar product which is (or at least was) seeing service in the current hostilities. While I do not have any specifics as to the exact reduction in weight, the youtube auto translate features says between "4 times" and "approximately 38%" lighter than conventional steel belts (I would assume that youtube fucked up and that "4 times" is a mistranslation of "about 40%")
It is not clear if the belts are disintegrating like the Ukrainian counterpart but I would assume that they are because you can't really injection mold such a complex object and making so many pieces be stuck together my something other than the cartridge would be really expensive and a pain in the ass to assemble.
Videos by Matthew Moss on the Ukrainian polymer links
Very interesting to see the continued development of Lightweight ammunition solutions, now it must be combined with polymer cased ammunition, to further the trend of guns like the Evolys and KAC LAMG being treated as big assault rifles. Ammunition will continue to get lighter, more consistent from round to round and in some cases, noticeably more powerful
Great video going over the differences between the New Obr. 2023 AK-12 and the previous model, they really stiffened up the handguard (which now has a new mysterious hole in the bottom of it) and the new safety needs to be cloned here in the states