saddlebag

Looking for info on 2-3 different types of rifles capable of being mounted/carried in a harley davidson saddle bag. Colt model 635 and M4 Commando HK MP-5N HK UMP-9 are 3 sizable options.
Does your dept. motor officers carry any? Or does some of your border agencies do?
Any info would help. Thank You.
i heard 3-4 agencies in Texas have motor units that have saddle or mounted rifles....

I'm a Florida motor, we are issued and carry M4's in our left saddle bag. They are small, 10 inch barrel with collapsable stock and fit perfectly.