I trained on the FN-C1, too. (Never did know why it was taken out of service.) I can't and never have been able to shoot a handgun worth a darn, but I could use a rifle pretty well. It would take me a good hour to get familiar with the FN again, and as Charmion said, substantial range time. And as for

"I wish people would get it through their heads that bearing arms is not glamorous or amusing, but an onerous duty that one should be grateful to avoid.",

truer words were never spoke.