false -- SCAR-L is unlocked at Level 10

Forgot AA-12, commonly forgotten. I think it's level 34.

This just doesn't seem right at all. All of the other COD games had weapons unlocking at all kinds of levels. I'm sorry but why would anyone believe that you have all of those guns at the beginning and the next unlock is at level 32? Your source is incorrect.

I'd say OP googled MW3 weapons and got an older forum post from CoD XP where all players were level 30.

Just my thoughts.

As porkins stated up above, your source in incorrect. This is how the XP event was with the guns and every thing else, everyone had all the stuff up to level 30 unlocked. So everything you have posted as unlocked actually is unlocked before level 30.(There is also the fact that they could have left some guns out in order to keep some surprises Not saying they did, but here's to hopeing for some )

Now of the Assault Riles you listed M4A1 and the M16A4 are the only two that would be unlocked leaving the Scar-L to be unlocked the mid teens and the CM901 to the mid to earlier 20s. With the M16, I could also see it being unlocked around level 7 or 8.

SMGs: The MP5 will be the only unlocked in the start, with the UMP following at level 10, or even at the mid teens. The PP90M1 will probably be unlocked around the mid 20s.

LMGs: The L86 LSW will be the starting LMG. The MG 36 will be early teens, maybe mid. The PKP Pecheneg will be around early 20s.

Snipers: The Barrett 50cal will be the starter. Then the L118A will be around levels 7-10. The Dragunov somewhere in the mid teens. Then the AS50 in the mid 20s.

Shotguns: USAS 12 will be the starter. The KSG 12 will probably be in the late if not mid teens. And the Spas 12 will probably come in around the late 20s.

Machine Pistols: The FMG-9 will be the starter. The MP9 I could see unlocked around the late teens, early 20s.

Pistols: USP .45 is the starter. The P99 may also be a starter, but if not then level 10 or so is when I see it unlocked. The MP412 is probably around the mid 20s.

Launchers: Smaw is the starter. The Javelin will probably be around the mid 20s.

Now these are not fully truthful, I just based it upon what guns were unlocked for each class, and how many were unlocked for each class. And with that, I won't be surprised if most of my predictions are true.

The Unlocked From Start guns unlock at level 1 to 10. Not start.

No not that many guns are unlocked from the start. You just have the facts wrong.