AO-26 integrally suppressed smg using heavily loaded 7.62x25
Cops with a Tankgewehr
An Australian cop recently got pinched for Illegal gun manufacture, turned his home into a factory in order to supply gangs
AEK-971 with Russian Interior Ministry
Malawian soldier with a Sterling
You know that "Diablo" muzzle loading 12 gauge pistol thingy, well the company that makes it "American Gun Craft" are working on a revolving 12 gauge pepperbox with standalone and underbarrel mounting capability
Found an upstart manufacturer that is making Longstroke AR's
FN Was recently showing off this very ugly SCAR 7.62x39 conversion at some Euro arms show
I find it kind of strange that they look to have designed a propietary magazine design when at 2015 SHOT they had a model that fed from AK mags, and the only reason I can think of that you would want a 7.62x39 chambering but not with AK mags is if you're french GIGN but I vaguely remember reading somewhere that they weren't doing 7.62x39 anymore
Recently while reading the book "Giving Up the Gun: Japan's Reversion to the Sword, 1543-1879" (1979) (there are those who claim that the book is partially bullshit, But that isn't relevant to the what I am about to discuss) I found on page 67 a footnote that says the following (Italics added by me)
"Early Japanese Guns were astonishingly well made. Some of them were used in war for two for three generations in sixteenth and seventeenth century Japan. They were then retired to government storehouses for a couple of centuries- and then, when Japan resumed the active use of firearms after Commodore Perry, they were brought out and converted to percussion rifles for the new national army. They performed admirably.
Still later, at the time of the Russo-Japanese war of 1904, some thousands of them were converted a second time, to bolt action rifles. The American Gun Expert Robert Kimbrough has written of the twice-retooled tanegashima "The Author has seen bolt-action rifles which carried names and dates from the mid-1600's, and weapons so converted were for use with modern power without blowing up!". No Higher Praise can be given the workmanship of the old Japanese Craftsmen.
The Source for Kimbrough's quotations is "Japanese Firearms" Pages 464-465
I Initially was astonished at such a claim and thought, this must be a result of mistranslated documents or nonfunctional forgeries created by shady antique dealers , but no, such conversions did in fact take place but I can find nothing about them being converted in the name of military service (which the text seems to imply to me)

The examples I was able to find images of are all in 11mm Murata ( a blackpowder cartridge) but Kimbrough said the guns he observed used "Modern Powder" (I take that to mean smokeless) and Japan's first indigenous smokeless powder cartridge was the 8x53mm R Murata (after being modified into such after being introduced as a black powder catridge) introduced in 1889, which fits the supposed Russo-Japanese war timeline.
@Club Sandwich
This is probably stretching the limits of your knowledge but you woudn't happen to be able to shed any light on these conversions would you?
Just Bizzare, Imagine a Brown Bess getting converted into a .308 and used in the Gulf War
Also, While I have your attention, I was wondering if you had any knowledge in machinegun design theory relating to top covers/feed mechanisms. Most LMG's made after 1945 use a system at least inspired by the MG42, with a nub on the bolt carrier that interfaces with a squiggly track actuating the feed pawls while designs like the Negev, LAMG and probably one or two others have (partially true with the latest LAMG's but the "extended" flip to side models don't have any feed guts outside of the original area and I assume the design change was to due with LPVO/Clip on mounting) have comparitively short top covers and have feed mechanisms contained roughly in the area of where the belt box is located. Is there any particular reason why this mechanism wasn't more popular in the past? Besides a "It's good enough" attitude and less of a concern regarding optics mounting?
Russian guy made his own Long Stroke SCAR, dubbed SPG-220
I can't find any photos of this thing so here are some videos, a (British?, Australian? He's some kind of assimilated foreigner) guy that looks like Don Vito with a mustache out of Idaho made a ambidextrous AR with two ejection ports and like I said, there are literally no photos