Top row from left to right: AK series, H&K G36K, FN F2000, M16, Steyr AUG.
Second row: H&K MP5, FAMAS, XM8, L85 Enfield, FN SCAR;
Third Row: SVD, Barrett .50Cal of some kind, Remington 870, Chauchat, Mosin Nagant;
Fifth Row: Flintlock, FN P90, MAC10, H&K G36
Combat Pistol looks like a Beretta 92 series, Tactical looks like a Sig Sauer of some kind, Inadequacy is maybe a 5.7, Bludgeon might be a Desert Eagle, Hand Removal Device is a Glock. Did it without looking at wikipedia anyway
I corrected the identifications:
Top row from left to right: AK series, H&K G36K, FN F2000, M16A2 (no taper to hand guards, A2 stock profile, A2 grip), Steyr AUG.
Second row: H&K MP5, FAMAS, XM8, L85A1 (hence the "Germans can't fix" crack), FN SCAR-L;
Third Row: SVD, Barrett M82, Remington 870, Lewis Gun (Image source is actually here.), Short Magazine Lee-Enfield No. 1;
Fifth Row: Percussion pistol (not a flint lock, note the flat hammer face), FN P90, Micro Uzi, H&K G36
Beretta M9/92FS, H&K USP Tactical, FN Five-seveN, Desert Eagle, Glock.