I carry a S&W M&P Shield 9mm all the time. It's very comfortable even on the bike under my leather jacket. I carry it in an IWB holster on my right hip. My only concern is if I low side on the right that'd hurt like hell. I'm not a fan of leaving firearms in vehicles or bikes. If someone breaks in or steals it it's now theirs. I've never had any issues with it when riding or any other time. I did have to buy new clothing when I started carrying as I'm 6'4" tall and needed longer shirts to conceal comfortably. I buy the duluth long tail t shirts now, they work great. I don't think anyone has ever been able to tell I'm carrying. If they have they didn't say anything or make a face at me lol.