The mod adds an XM8 assault rifle converted from a multiplayer model to the singleplayer game.
The original can be viewed here:
http://cfgfactory.com/downloads/show/4d3f20f556170

As a bonus, a variant of the g36c with a silencer has been added, also converted from the multiplayer version, as well as a variant of the M4 rifle chambered for 7.62*35 mm 300blk (the firepower of this variant of the M4 has also been significantly increased)






You can get additional weapons using cheats:
give xm8,
give g36c_silencer ,
give m4_300_silencer

You can download it from here:
https://www.moddb.com/mods/multiplayer-weapon-models-for-singleplayer/addons/xm8-assault-rifle