extra charge for carrying

[kryptonian]

not sure on this one. if you are OC and accidentally or even intentionally commit a crime and you are armed - can the possesion of a weapon legally casrried during the commision of the offense be tacked on?
here's the situation i ran into. after work i stopped off at walmart to grab some things. OC of course. after i checked out i went to put stuff in my jeep. it was only then that i noticed that an item (sinus medication) wasn't bagged and receipt showed i didn't pay for it. i returned in the store and paid at self checkout as i did before. the cashier running self checkout remembered me from 3 minutes earlier and asked what happened and told him i didn't see it and came in to pay. he thanked me for my honesty and i left. if leaving the initial time and was confronted by walmart security or whoever and was accused of the theft would my firearm automatically be a kicker on top of the charge? it wouldn't have been used to effect the commision.
quick legal lesson - all crimes are attached a culpable mental state. intentionally, knowingly, recklessly or carelessly. i guess mine would have been carelessly but commited anyway. rather than a simple theft charge to defend i may have had to defend against the automatic 2 year sentence for the handgun on me legal carry or not. if nothing else i was a good, honest example of OC to the store manager who was standing there when i returned.
any simple little thing could put us in that situation.
any ideas?

[CV67PAT]

I think that it is a mandatory two year sentence for the possession of a gun during the commission of a felony.

[TheQ]

No mens rea, no crime.

[Bronson]

No mens rea, no crime.

It doesn't apply in MI  but I've read (I can't cite it because I can't remember where I read it) that in at least one state trespassing while in a possession of a firearm automatically jumps to felonious trespass.  I just did a quick Google search for "felony trespass" and found that FL has this provision.  

(c)  If the offender is armed with a firearm or other dangerous weapon, or arms himself or herself with such while in the structure or conveyance, the trespass in a structure or conveyance is a felony of the third degree,

So again, while MI doesn't have this provision in our law it isn't beyond the realm of possibility.

http://www.heritage.org/research/reports/2010/05/the-criminal-intent-report-congress-is-eroding-the-mens-rea-requirement-in-federal-criminal-law

This is a good book that many here would probably enjoy "The Tyranny of Good Intentions: How Prosecutors and Bureaucrats Are Trampling the Constitution in the Name of Justice"

Bronson