I played around a bit in the combat arms inventory tab. You can glitch the slots soo easily. If it lags its very easy. But if it doesnt it's a bit more difficult.
Edit: Try clicking the equipment. When you hear the equip sound quickly press the tabs for example Character/Head/Face/Uniform/Vest and backpack. It's usefull for crashing rooms. The only glitch that works ingame is trying to equip a gas mask with an infected mask
Gas mask = (Clearing hard difficulty on cabin fever.)