LMT looks to have some new barrel tech, A style of feed ramps I've never seen before (said to be designed around projectiles with blunter tips) and what appears to be some kind of support for the extractor(said to help in the context of ruptured casings, might also aid in OTB scenarios as the HK416 has a similar feature). This photo features the extension of a 12" MRP piston barrel
Houthi said to be associated with the Interior Ministry with a 416(?)
Before and After of the blast baffle of a Prototype OCL Infinity 556K after 2160 rounds fired from an 8.4in barrel over 8 hours, numerous heating and cooling cycles. No Muzzle device (Flash hider or brake, the suppressor was attached to a Direct thread hub adapter)
Defiant Ligma Six printable lower for the upcoming Lima Six Belt fed
Fire rate comparison between Two AR-9's, one direct blowback the other using the Maxim Defense roller delayed buffer
One Arfcom poster's method of adding weight to his TX-22 slide to slow down ROF when using his FRT (achieved a reduction of 400 rpm, 1900 to 1500)
3D printable AR Magwell and SAW Dovetail compatible belt drums
50 round model (designer points out bounce obviously fit a few more but he's referring to it as the 50rnd model)
100 round example
Blast Baffle of a Huxwrx Ventum-762 after 1k round of 5.56 through an 11.5 barrel with a 3 prong rearden flash hider
Blast Baffle of a Sig Saar SLX-556 after 2k+ rounds of semi auto fire on an 11.5 MCX with 3 prong clutch-lok flash hider
Here's the blast baffle of that same suppressor at a mere 100 rounds (Saar, Si(n)g(h) Saar QC and manufacturing standards very good Saar)
Not the best image but here's the Blast baffle on another SLX-556 with "two or three times" the round count of the above example, but has been shot using a brake exclusively after the 2500 round mark
Article going over the basic history of 3D printed suppressors