I don't know for a fact but I sorta doubt it, as Complete reskins the guns that are already in the game ... seems like that would probably conflict with a mod that adds other weapons, but again that's just a guess.
Trust me, SoC (and all the Stalker games) already have *plenty* of different guns for your shooting enjoyment
I always end up carrying the same 3 guns every time I play it (which is up to at least 10 playthroughs by now lol): TRS-301 with all the attachments, the Vintar BC, and the Chaser shottie. Well, that's my loadout through most of the game, but of course I switch to the 2 best weapons (FN 2000 and Gauss) once they become available at the CNPP.
BTW, I'm SO jealous of anyone getting to play SoC for the first time. It's SUCH a great game once you get your bearings in The Zone, get some decent weapons, and just generally get 'the hang' of the game. #1 rule of Stalker games: Make LOTS of *manual* saves (not just quicksave spamming). #2 Learn to get headshots. #3 Use the right weapon for the task. #4 Make sure to play Lab's X-15 and X-18 alone in your house, in the dark, with headphones on, turned up loud.
Enjoy, and feel free to join us on the Fan Club thread ... I've given tons of advice for 1st time players, and I believe the entire thread is free from any significant spoilers.