FN FAL reloaded like a M4.
This isn't possible IRL.
All models used in the video are from the SFM and Garry's Mod Workshop:
Character models:
https://steamcommunity.com/sharedfile...
Sounds:
Insurgency
Modern Warfare 2 (2009)
Based on @MrShadow-vv6zq comment
"First video I watch and I already love this channel.
How would be a AR-15 Tactical reload, but with a FN FAL?"
Hopefully I did this comment justice.