This mod adds fully upgradable .223Rem M4A1 carbines, M16 Rifles and .308Win SR-47 rifle.

Game Location:
Crate with rifles in Primm.
"The Tops" M4 and modifications can be purchased at Sgt. Daniel Contreras in Camp McCarran.
"The Tops" M16 and modifications can be purchased at the "Gunrunners" store just outside of "Freeside".
M4 "Desert Viper" carbines can be purchased at a quartermaster Bardon in the Hoover Dam Offices.
Colt M733 carbine and modifications can be purchased at Dino-Bite Gift Shop in Novac.
A few guns waiting for you in different locations of the desert (Nipton, Camp Searchlight, cave of cannibal and ....). And be sure to visit Snipers Nest.

And some weapons and/or modifications can be purchased from one of the merchants. ;)

All of the weapons can be set to semi or automatic fire if Installed New Vegas Script Extender and Select Fire Script.
Press the 'M' key to switch fire modes.
SelectFire.esm is in the mod .zip file and must be installed in the game directory, If you have not used it previously with other mods.

Console code:

ECR M4A1 = xx00ae4a
KAC SR-47 = xx00b6e5
M16A4 Marksman Rifle= xx00BF7F
The TOPS M4= xx00F034
The TOPS M16= xx010fb7
The TOPS SPR= xx011b2c
Colt M733= xx015A3A
M4 Crane Stock = xx01547d
M4 Fixed Stock= xx01547e
..............= xxxxxxxx
..............= xxxxxxxx
..............= xxxxxxxx

Carbon Fiber Parts (M4) = xx00b6e6
L-3 EOTech 3X Magnifier = xx00AE49
AN/PEQ-2 TPIAL = xx007D91
KAC Silencer = xx007AB1
Trijicon Acog 4x= xx00C53A
M4 Long Barrel= xx010162
M4 EOTech 557.AR223= xx00B405
M4 ELCAN Scope= xx011e0a
M4 ExtMag= xx011e09
M4 11.5" Barrel= xx01547c
M4 Carry Handle Scope= xx015D17
..............= xxxxxxxx

Requirements:

New Vegas Mod Manager:
http://www.newvegasnexus.com/downloads/file.php?id=36901
New Vegas Script Extender:
http://nvse.silverlock.org/
Select Fire Script:
http://www.newvegasnexus.com/downloads/file.php?id=40242

Installation:
Extract the files to a temporary location.
Place the files in your Fallout NV Data folder (ie ..\Fallout New Vegas\Data)
and place a checkmark next to the .esp file.

Uninstall:
Delete the files/folders associated with the mod.

Issues or Bugs:

Specify them to me and I will correct them so quickly as soon as I can.

File History:

V1.08F
The latest versions of files combined into a one archive. A few small changes for the some models. Separate file, I added alternative texture for the two models.

V1.07(1.08)
Added several new carbines.

v1.06
Added several new carbines.

v1.05
Added upgradable Colt M733 carbine.
Fixed a small bug with a rifle The TOPS M16

V1.04
Added upgradable M4 "Desert Viper" carbines.

V1.03
Added upgradable The Tops M16 rifles.
Changed some of the characteristics of the guns.

V1.02
Added upgradable The Tops M4 carbine.

V1.01
Added upgradable M16A4 Marksman Rifle.

Credits:

Thanks to Twinkie Masta, El Maestro de Graffiti, Revolutionart, B0T, TheLama, Imperator3, Dread Wolf, Ahztek, Stoke, Syncing,
Boba Fett, sHiBaN, Pelinor, Snark Skin, Silvio Dante, WangChung and many other people for their outstanding models and textures..
Sorry if I forgot someone.

Special thanks to Kerededyh, Dread Wolf and Corejob for their Select Fire Script.
http://www.newvegasnexus.com/downloads/file.php?id=40242

License/Legal:

You can use the plugin resources (models, textures, etc) without my permission. Don't forget the credits.

P.S.: It is my first mod for public use. Don't estimate very strictly and sorry for my bad English.