Please note: you need to download GTA V Weapon Data which made by fkngoob due to ancient data corrupt my gameplay
Also after replace weapon.dat, you need to replace default.ide to avoid game crash due to game cannot understand what animation supposed to that weapon.

Copy and paste this lines in weapon.dat made by fkngoob:

For M16:
$ M4 INSTANT_HIT 900 900 356 -1 5 rifle 30 35 0.74 -0.04 0.13 0 0 0.45 1.3 7 9 7 7 9 7 99 7001
$ M4 INSTANT_HIT 900 900 356 -1 5 rifle 30 35 0.74 -0.04 0.13 1 200 0.45 1.3 7 9 7 7 9 7 99 7011
$ M4 INSTANT_HIT 900 900 356 -1 5 rifle 30 35 0.74 -0.04 0.13 2 999 0.45 1.3 7 9 7 7 9 7 99 7031

For Level-Action Rifle:
$ COUNTRYRIFLE INSTANT_HIT 900 900 357 -1 6 sniper 30 50 0.7 -0.05 0.2 1 300 1 1.2 6 17 7 6 17 7 99 7038
With this HEX, player can shoot during walking, and have a reload animation.

After that, you must rename .txt to .dat, which a thing that I forget mention to this flaw from previous mods.
I recommend use God Mode mods for CLEO from gtagarage, use for kill aggressive drivers from cheat with infinite ammo and never wanted for more fun.
But don't play with this (I mean aggressive drivers from cheat) over 40 minutes, it cause a problems.