Depends on the game. For USPSA no. For IDPA I generally use my Glock 17 duty gun and most of the time in my duty rig for work. For three gun I sometimes shoot my duty guns to stay familiar with them but its not as competative to shoot a SCAR 17 in open and a 14 inch 870 with a Glock 17. My SCAR has two optics (Nightforce 2.5-10 and a off set R1 aimpoint)
I do attend LEO only matches and of course use my duty guns for that.