Well, here's a quick list of all the weapons that I'd like to start with
AK47
AKMS
AK74
AK74M
AK104
AK105
AKS74U
AN94
RPK
RPK74M
PKM
SVD
SVDS
SVDK
SVUA
SV99
SV98
V94
KSVK
VSS
AS Val
Groza (system)
9A91
VSK94
I'd also make some pistols and SMGs, but mostly I will have those models ready for Raven Shield - they aren't so useful in OFP.
I'm also going to model some Russian optics to mix and match on the weapons as I see fit:
Cobra reflex sight (AK104, AKS74U)
Compact collimator (Bizon)
PK-01 collimator (9A91)
PSO (VSS, SVD, SVDS, SVU-A)
PK-A (AS Val)
1P21 (SVDK)
1P29 (AK74)
PO 3x21P (AN94)
That's not a full list of how they will be used, just some ideas off the top of my head.