673 BK1124 Boat - initial armament was two #34 KT-28 guns (T-28 tank turrets). From 1940 there might have been mounted current #50 L-11 gun and there were twin 12.7mm DShK AAMG. Later there were mounted #51 F-34 guns (T-34 turrets).
(According to "Enciklopedia monitorov" book)
More correct name is BKA Pr1124 Boat - abbreviation was BKA, "pr" is a short of "project 1124". Out of curiosity, upper view https://images.app.goo.gl/MXXvB5hBC4NBSkCk9
674 BK1125 Boat - the same remarks as for armament and name.
Icon should be different, than the above one, eg. 711.
(line drawing:
https://www.klueser.de/pic/PanzerkutterBKA112x_HP.JPG )
There might be added a numerous light river armoured patrol boat, eg. copied with changes from Nat. Chinese OOB #79 - the photo seems to be a typical Soviet boat. Armament should be one #139 MG and naval 37 mm gun (012 37mm Hotchkiss?). Used from 1/30. Better icon however is 705.
I don't thnink anybody would want to create SB-37 class river monitor, with 2x102 mm and 3x45 mm guns 
https://i.pinimg.com/originals/76/74...fa4f71e4a1.jpg
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Weapons:
112 Tokarev ST38/40 - better name is Tokarev SVT - the rifle's name was SVT, 1938 or 1940 only marked model
114 Tokarev TT-33 - I suggest TT-33 Pistol or better just TT Pistol, as they were known in Russia (
https://ru.wikipedia.org/wiki/%D0%A2%D0%A2 ), so that everybody knows what is this.
That's basically all as for the USSR.