Korobov TKB-059: A Soviet three-barrel bullpup assault rifle, capable of fully-automatic fire from all three barrels. It also has a triple-stacked magazine to feed all three barrels from the same mag.
AN-94: With a two-round burst functionality that spits out projectiles at over 1,800 rounds a minute, this is one fast-cycling rifle. Due to its unique method of operation, the recoil from the first round is not even felt until both bullets leave the muzzle in burst mode.
G11: First developed in the 1970s, the most notable feature of this futuristic rifle is its use of 4.73×33mm caseless ammunition. While it was well ahead of its time the G11 was never adopted due to political and economic issues.
XM25 (Counter Defilade Target Engagement [CDTE] System): This is an advanced air burst grenade launcher first tested in Afganistan in 2003. Thanks to successful trials, the XM25 is slated to be fully deployed in 2015.
LeMat Revolver: This revolver is the great grandfather of the Taurus Judge. The black powder revolver had a unique 20 gauge smoothbore barrel in addition to a .32 cal barrel for extra versatility.
MK3A1 Pancor Jackhammer: The Jackhammer is the only a gas-operated revolver shotgun ever produced. However, its unique method of operation is also the reason it was never adopted by military or police forces.
CS5 (Concealable Subsonic/Supersonic Suppressed Sniper System): The CS5 is a dedicated short- and medium-range sniping gun, designed for use in urban environments. Even with its 12-inch barrel the rifle is capable of sub-MOA accuracy with the proper ammunition.
George Luger’s Secret Rifle: Apparently back in 1906, George Luger started working on a rifle version of his famous pistol.
Barrett XM109: The Barrett XM109 is an anti-materiel rifle. It was designed to penetrate light armor and materiel out to a distance of 1.2 miles.
American-180: This submachine gun was developed in the 1960s and fires .22 LR cartridges from a pan-style magazine.