There is a limited but a power selection of weapons in delta force.
The main weapons which people use is the

M4 a small version of the M16 it has a grenade launcher
M203 40mm. It also has a 4x scope for sniping and viewing.
a very complicated but much useful weapon.
It is difficult to master it.
Range: 500m (400m for the grenade launcher)

Ahhh.. what a weapon. I love this beautiful baby.
This weapon is the FN Minimi also know as the M249 SAW
hehehe this baby is very good all around. You can raid the other team and  kick their sorry butt.
hehe I personally use this weapon.
Range:500m but in real life the actual range is 600m
no scope

Ahh the powerful sniper gun. Made by a custom gun maker for the US army
this powerful weapon will deliver a .50 bullet to you and strike you with one accurate shot.
In the Gulf war this gun was knocking down radar sites at precision range up to 1800m!
The weapon is called Barrett note the difference between Barrett and Beretta
It has an 8x scope.
Range More than 1000m
 

Remington Rifle
There are more weapons such as the remington sniper rifle.this weapon is
also good as the Barrett but this one is lighter and a lot more quicker in reloading than the barrett.
Range 800m
8x scope

H&K MP5 SD
This weapon is silenced so you can not really heard where the bullet is coming from.
this weapon is good in really life but in Delta force you need the whole round to take some one out!
Range 100m
no scope