Hello there, MPGH! Welcome to a new Weapon ID list for Modern Warfare 3, version 1.9.461. All of these weapon IDs were gained one-by-one using Lovroman's MW3 SP/Survival/Spec Ops tool. (Can't link you to the post yet.) Feedback on these IDs are greatly appreciated, and you may contribute to it down below.
Note: Any skips in numbers means they are nothing. (0, 1, 2, 3, 15, 16, 18, 19, 20, 21, 68, 70, 71, 72)
Note 2: [Crashes game] indicates that the ID has crashed my game. It may or may not differ upon different maps, I dunno.
Code:
0 - None
1 - None
2 - None
3 - None
4 - PKP Pecheneg
5 - M9
6 - Five Seven
7 - Riot Shield
8 - P90
9 - P90 Holographic
10 - P90 Red Dot Sight
11 - PP90M1
12 - PP90M1 Holographic
13 - PP90M1 Red Dot Sight
14 - Default Weapon
17 - Crosshair (RPG)
22 - Stinger
23 - [Crashes game]
24 - [Crashes game]
25 - Five Seven
26 - USP .45
27 - MP412
28 - Desert Eagle
29 - .44 Magnum
30 - P99
31 - G18
32 - Skorpion
33 - MP9
34 - FMG9
35 - MP5
36 - UMP45
37 - MP7
38 - PM-9
39 - PP90M1
40 - P90
41 - M60E4
42 - PKP Pecheneg
43 - MK46
44 - L86 LSW
45 - MG36
46 - M4A1
47 - M16A4
48 - SCAR-L
49 - ACR 6.8
50 - AK-47
51 - FAD
52 - G36C
53 - CM901
54 - MK416
55 - Type 95
56 - Model 1887
57 - USAS 12
58 - SPAS-12
59 - KSG 12
60 - Striker
61 - AA-12
62 - MSR (No scope appeared)
63 - Dragunov (No scope appeared)
64 - RSASS (No scope appeared)
65 - L118A (No scope appeared)
66 - AS50 (No scope appeared)
67 - Barrett .50cal (No scope appeared)
69 - RPG-7
73 - MP5
74 - WEAPON_BENELLI
75 - Stinger
(Anything over 75 has crashed my game. Beware!)