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ProShooter
ProShooter, Firearms Instructor
Category: Firearms
Satisfied Customers: 3867
Experience:  Certified Firearms Instructor and Glock Certified Armorer.
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I have a S&W 9mm Sigma handgun. I am wondering what are

Customer Question

I have a S&W 9mm Sigma handgun. I am wondering what are the chances to go off by itself if is chambered and kept inside a car where temperatures can reach.... 130-140F... I guess?
Submitted: 5 months ago.
Category: Firearms
Expert:  ProShooter replied 5 months ago.

Good afternoon,

My name is ***** ***** I am happy to help. As a firearms instructor, I receive this question a lot. While not impossible, it is very unlikely that the round will "go off". Ammo should, in theory be kept at normal room temperature, but there are studies that have been done where ammo can be raised well above room temps and won't go off. There is another issue though of the heat warping the shell casing and causing an issue with those cartridges when you do plan to fire them. Think about a glass jar with a metal lid that is stuck. You run it under hot water and the lid expands, loosening it. The brass from the casing can warp as well.

I would suggest keeping the gun in a lock box or some shaded area to minimize the exposure to heat.

Hope that this is helpful! If you have no other questions, please remember to complete a positive rating on your screen now so that we can close out the question.

Thanks!

Jim

Customer: replied 5 months ago.
Thanks Jim.
I am also interested in learning if the gun can trigger by itself as high temperatures may affect trigger mechanism?
In other words is it wise to keep a chambered s&w in the car? From the perspective of possible going off by itself
Thanks
Expert:  ProShooter replied 5 months ago.

I cannot imagine that anything to do with high temperatures in the car could cause a firing pin to retract and go forward, striking a live round.

If you want to be 100% safe and sure, just unload the gun when its not in your immediate control.

Expert:  ProShooter replied 5 months ago.

Anything else?