-The M9 with TacKnife's iron sights are off, they shoot below the tip.
The M9's sights are aligned with any other attachment.
-The M9 with Silencer will still show you as a red dot on the mini map when fired.
-The MG4 with Silencer will still show you as a red dot on the mini map when fired.
-The M240 with Silencer will still show you as a red dot on the mini map when fired.
-The MG4's iron sights are off, they shoot WAY below where the tip is.
-FMJ on the Spas-12 doesn't work.
-The FAL with Red Dot Sight is very off, the bullet lands to the bottom right of the dot.
-The Desert Eagle's sights are off. *Realinged with tactknife*
-The M93 Raffica's ironsights are off and shoot to the right of the tip.
They are also slightly off with the Red Dot and Holographic sight too.
Some weapons have differences in themselves with some attachments, or are different from all other weapons. These differences are most likely intentional for balancing purposes.
-The FAL with a Holographic sight gets its damage boosted from 55-35 to 55-40. Stopping Power ONLY has an effect on the FAL with the Holographic sight, making it a consistent two shot kill at any range. The FAL without the Holo sight gets virtually no benefit from Stopping Power.
-The M16 with a Holographic sight gets significantly less recoil/spread than without it. With the Holo sight, it gets less recoil/spread than the FAMAS.
-The AA-12 with Extended Mags gets 2 times its original magazine size (8 to 16) as opposed to other weapons only getting 1.5 times their orignal magazine size.
-The M93 Raffica and G18 machine pistols, when Akimbo'd, get a smaller and more accurate hip fire reticle. Other weapons with Akimbo get a larger reticle.
-The Model 1887 shotgun with Akimbo has less effective range than a single 1887. This is due to an old patch IW made to nerf the Akimbo 1887's for balance purposes.
-L86 LSW's ACOG scope as a different look then normal ACOG.
-UMP45 Loses no range with silencer.
Credits to BlameTruth for showing these in a vid on youtube