One thing i've found about GBB's of any kind (Especially the more loud ones) is that it makes people more willing to stay behind cover when they're being shot by them. When I was attending Operation Keystone Strike 4, some guy was using a Mac11 GBB, and when that thing let rip everyone stuck behind walls and windows, haha.
Other than that, most of the other benefits of GBBR's have been spoken already
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