That's an odd button for the releasing of the trigger plate, but entirely possible I suppose. I think I'd like it better if it worked the way a Perazzi does ................push firmly forward on the safety slide and it releases the trigger plate to be pulled out the bottom. Whatever that is in the rear of the guard, it is a much better place for a barrel selector than a trigger plate release button, IMO.

SRH

May God bless America and those who defend her.