These have been shipping for some time. Recent complete guns shipped with them (mod 4), and component handles were the new design as well.
The upright skirting has gas-control properties. Unsuppressed, some will notice them, some won't. I have not shot the new handle on a suppressed gun, but upon information and belief, they work well for gas control.
I like the old one. I like the new one. I wouldn't run out and replace old ones unless they were at the end of their service life, or you are running a suppressor.
More good stuff from BCM.
2012 National Zumba Endurance Champion
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