Federal LEO, I carry a Glock 19 for duty and I am qualified with Rem. 870 for duty. Used to also carry H&K MP5, came in handy on narcotics busts.
I was also a FI, as a collateral duty, for 13-14 years until I pissed off a boss. I instructed pistol, revolver, rifle, shotgun and MP5.
In the past I have carried and qualified for duty with Glock 26, S&W 60, S&W 6906, S&W 66, Colt Border Patrol (yes when I was a BPA), Beretta 92SB and Beretta 92F, Steyr AUG, Ruger Mini 14, and, one or two others, all for duty.
All the best,
Glenn B