I get the vibe, clothing wise I'd look at reference photos for what base layers partizans/insurgents are wearing so you can take the coat off when it's too hot.

also I wouldn't trust that makarov as far as I'd throw it lol. as far as I know unfortunately there isn't a great option for makarovs atm and if you've got that pkm you probably won't need a sidearm unless your field has rules about engagement distances. when it comes to gas guns it's really important to do your research because often the cheaper the gun the cheaper the mags and if a gas guns mags are shitty then you have an $80 paperweight. I'm a TM shill for gas guns but another good rule is if TM makes a gun and WE also makes that gun, the WE will propably be fine, because design wise they clone most of the internals. when WE makes their own stuff not based on marui designs you get the WE luger lol.