As of March 24th, 2017, launching with the profiling branch alleviates all issues for both 32 and 64 bit versions on my system.

All of my exit codes have been 0x000000FF - Unknown as of this point.

It's up to the designer of a mission to decide what people have access to. If people are given the choice to equip a bunch of powerful stuff, they'll do it. Regardless, with normal ammunition, attaching a suppressor will make the rounds travel further. The ballistics work as intended.

Except there are no subsonic magazines in the game currently. So attaching a suppressor to your gun will lengthen the barrel, and cause standard ammunition to travel further.

Deploying a weapon without a bipod does not give you the full benefits of deployment, only having a bipod will. "Deploying" without a bipod is actually like pressing the gun into the nearest object (the ground, in this case) for support. It is an intentional feature.