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Old January 07, 2013, 13:02   #69
kotengu
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FALaholic #: 1594
Join Date: Nov 2000
Location: Baxter, TN, USA
Posts: 7,668
Dangit - curiosity got the better of me and I had to run the numbers. Ignoring friction and simplifying this as much as possible, for a 1:12 twist barrel at 62,000 psi the bullet would provide about 11 ft-lbs worth of torque on the barrel. In theory as long as you torqued the barrel/reciever to more than 11 ft-lbs it will not unscrew.

Of course, friction plays a huge part here and cannot be ignored, but bringing friction into the equation will only make that number smaller. Either way - I'm pretty confident that you're not going to unscrew your barrel by shooting it.

That also makes me feel better about my semi-random 20 ft-lb torque spec for flash hiders though.
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