To all the people asking about problems with custom weapons aiming to the left, or there being a jump between the last frames of the reload and hold anim: the problem looks something like the streamable link below, right?

If so, those problems are currently caused by Fnuxray's animation mod overriding vanilla M4A1/AK5/M16/SCAR-H/etc hold and reload animations, while those custom weapons are assuming you will use vanilla hold animations/reloads.

Off the top of my head (ie, there might be more), the list of affected custom weapons would include the following:

Pawcio's: HK416, maybe the SCAR-L and AR-18? (needs confirmation)
Carl's: MCX Virtus, FN MK17 Mod 0, AAC Honey Badger, Primary Q Honey Badger, M4 Block II, BCM Cold Harbor, Noveske N4, Remington R5, and HK416C Standalone
Mira's: SAI GRY, ACR-C, and Fang-45
Mine: Black Ops XM4, IW NV4, VK78 Commando, and MCX Gen 1 (for some reason, this last one should theoretically be safe since it clones Fnuxray's anims, but someone below reported the issue existing)