Special Feature of Glock 18 should have been Fully-Automatic rather than Burst-fire.
Bullets shouldn't be able to pierce the walls or doors like the game.
M1014, G3SG1, SG550 are Semi-Automatic, however you can hold the Fire button to make the gun fire without stopping.
People still use Experimental-model M4-Super90? No. B42 should be M1014 rather than XM1014.