Mrostov, some stupes have never racked a AR at night. Such nitwits don't know that 50 feet is not even 20 yards and on a half-way quiet night a slide racking will be heared well past 50 yards. Those are the same stupes that don' know the SPECOPS use LOCKED SLIDE pistols with cans to do sentry takeouts.
Such lack of knowledge is a sure sign of a wannabe chairborn commando.
You have no knowledge on field craft, how or what to pack in your ruck, firearm maintenence, land navigation. Besides if you feel that you have a requirement for a suppessor, go out and buy on legally!! Simple, isn't it.