All credit to Miralyn, Pettan and Mighty Condor.
Pettan has already released his YET ANOTHER MIRALYN WEAPONS PORT, that mod has included all Miralyn's marvellous works. So please, try his mod instead of this one, you definitely will have a full experience and lots of fun.
Installation: Download the .zip file, extract all, and add the folder "Mira-M16A4" to your user/mods/ folder in SPT
All can purchase at Lvl 1 Peacekeeper
Original mod by Miralyn
Original Mod Listing: M16A4-REMAKE
SPT 3.9.8
4.7K Downloads
Compatible with Moxo-Pixel's mods (TGC, mods related to painter)
especially the latest bipod in TGC!
Unknown SPT Version
652 Downloads
re-uploaded, hopefully, this time the mod can be more behaviour 
Unknown SPT Version
1.4K Downloads
for SPT 3.9.0
Unknown SPT Version
1.7K Downloads
Realism compatible, thx Fontaine and all these great mod creators in this community!
Hotfix: corrected Atlas-compatible issue
Unknown SPT Version
2.0K Downloads
3.8.0 update, add one build for Colt 901 (full auto), unfortunately, no changes in the model...
Unknown SPT Version
2.4K Downloads
3.7.x
Not quite yet...