my first add-on weapon, based on M4 custom with .50 Beowulf barrel, a more realistic one than the game one, high damage due .50 Beowulf bullets(damage between 7,62 x 51 NATO and .338 Lapua),  low ammo capacity per magazine due the conversion of 5,56 x 45 NATO to .50 Beowulf bullet, good accuracy but high recoil and very low stability...
*Unlock level: 60

About the weapon:
*good concealment for an assault rifle(same as CAR-4)
*fast reload due to a shorter mag
*now the weapon is automatic (spray and spray? is not recomended)
*good amount of attachment, now more
*now use custom sound
*very high damage for an assault rifle
*very high recoil for an assault rifle(a bit less than Ash 12.7)
*sniper rifle accurate(almost)
*is not a sniper rifle, so sniper rifle skill won't work on it

Overall changes: 
the weapon itself, customization, stats, and now the weapon fit better the assault role
*NEW Fixed Vertical grip ADS stance issue, thanks Angel of Vitamin reported the issue, and Alcat, Silent Enforce and Killerwolf
advices *for more details read the Changelog, below the cover image

ISSUE:
*when you equip the stubby vertical grip, the weapon reload animation will automatically change to Bootleg one, it doesn't completely sync with the weapon, but it looks ok
*the stock adapter has some stance issue, no idea why, even though it has the same size as the default one

requirement:
BeardLib is required.

SuperBLT is required.

Attachment Animations (Old) or Weaponlib (New) is required. (Don't use both!)

MOD Recommendation:
-Underbarrel Weapon Base
-Custom Attachment for Custom Weapons
-Tactical Reload
-Custom Underbarrels for Custom Weapons
-Attachment Descriptions

How to install:
just download it and extract the archive to "mod_overrides" of your Payday2 folder.

Special Thanks:
Thanks to Alcat, Zdann, Krimzin,어나아멍슽티픗... and all the people who helped me in the community.
Thanks to >:3(Pawcio) for adding me to CAFCW and WILDS0N for the MP7 flip-up sight.
Thanks to Cpone and Killerwolf for adding the weapon to CUFCW
Thanks to CVIII for some texture tips
Thanks to Silent Enforcer for the muzzle flash adjust and a new weapon sound