HK416
Sounds, most attachments and their descriptions were inspired or taken from the Urban Decay mod pack for Garry’s Mod.

Accurate, reliable and versatile, the HK416 has only one problem, namely its very high price."
Having 45 attachments in total:
4 sights (Red Dot/EOTech/ACOG/LPVO),
6 stocks (HERA CQR/B5/Fixed Polymer/SOPMOD/MOE/HK416C),
3 barrel attachments (Compensator/Long Suppressor/ Short Suppressor),
2 barrel types (Short Barrel/Integrated Silencer),
5 laser types (Green/Red/Blue/Yellow/IR),
3 vertical grips (Vertical/Horizontal/Rotated),
3 pistol grips (Custom/Rubberized/Sport),
4 handguards (Extended/Midwest M-LOK/Long M-LOK/M-LOK),
3 triggers (Light/Heavy/Sport),
2 conversions (.300BLK, .22LR),
4 springs (Light bolt, Light bolt 2/Heavy bolt, Heavy bolt 2),
2 etc. (Magnifier/Magwell),
the HK416 can be modified into a lot of different roles, be it a DMR:
A silent sentry killer:
Or a concealable HK416C: 
Other builds examples:

And before I finish this description, I want to apologize for taking so long to complete the mod. I have been busy with many things – family, exams, and being lazy in general.
Thank you for your support!
You can download the mod by clicking this link[drive.google.com]
Use this tool to pack spritesheets[drive.google.com], as it outputs a format used by the game.
And yes, please report any bugs you encounter c: