The Adrenaline Vault's preview of SWAT 3 Close Quarters Battle is up looking ahead at Sierra's upcoming game of tactical police operations. This bit describes the weapons in the game, and their emphasis on realism:

So, what kind of goodies will you get as a member of a Special Weapons and Tactics team? As usual, Sierra has utilized their close ties with the LAPD to access authentic SWAT information. Each officer can carry a primary weapon, such as a rifle, shotgun or submachine gun, and a backup sidearm. Some of the primary weapons, such as the M4A1 rifle, can be equipped with non-lethal rounds while others, like the Benalli Super 90 combat shotgun, can fire breaching rounds composed of powdered steel that destroys locks on impact. In addition to these weapons, each officer usually brings along an assortment of utilities including handcuffs, CS tactical gas grenades, C2 breaching charges, flashbangs, chemlights (glow sticks used to illuminate rooms and mark areas that have been cleared of threat) and a multipurpose tool called a "crunch." All of these resources expand the element leader's tactical options and will allow players to experiment with multiple strategies.