So, I finally, perhaps, found the most detailed article about this weapon: [1] (on Russian language, though). --Slon95 (talk) 12:59, 17 November 2017 (EST)
Well, this article provides a lot new info. Looks a very careful research. Greg-Z (talk) 13:17, 17 November 2017 (EST)
Okay, so what does that mean? "M1916" is actually M1919? Since the real M1916, it turns out, did not have a front grip and a barrel shroud. --Slon95 (talk) 18:18, 17 November 2017 (EST)
Hm. Author says he only saw one gun in what he said was the original configuration, though. From what google translate tells me, the one he saw had a 15-round magazine and no foregrip? Evil Tim (talk) 18:47, 17 November 2017 (EST)
And a number of later versions, which I do not even know how to describe: [2], [3]. --Slon95 (talk) 19:05, 9 May 2018 (EDT)
Fedorov-Degtyaryov
I found a few mentions of this gun on the internet. So it is known that 4 prototypes were created (minimum). The first 3 prototypes were based on the basic 25-round magazine-fed model, the fourth prototype was a plate-fed version. I think it's worth putting all 4 prototypes on the main page with the date and prototype number.--Emto_PL (talk) 06:25, 8 December 2022 (UTC)
Exhibition at the Military Historical Museum of Artillery, Engineering and Signal Corps in St. Petersburg, dedicated to the work of Degtyarev and Fyodorov.