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10mm mainspring?


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Old 08-06-2015, 01:18 AM   #1
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Default 10mm mainspring?

I have a Rock Island Armory Tactical II in 10mm, and I've read a small amount on different forums about others needing heavier mainsprings for their guns, when shooting higher power cartridges. Any thoughts?
Any ideas for any part of the gun is welcome.


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Old 08-06-2015, 10:35 AM   #2
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The heavier mainspring may reduce the amount of felt recoil (more resistance for the hammer needed to move), but will put more weight on the sear.

Watch your ejection of empty casings. The recoil spring works with the main spring.

And the primary job of the recoil spring is to return the slide to battery, secondary is to assist with the recoil of the slide moving to the rear.


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Old 08-06-2015, 12:59 PM   #3
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The main spring is what powers the hammer. The recoil spring rides under the barrel. 10mm when fired with FBI type loads (subsonic) needs no different srpinging than any other 1911. Hot loads demand a heavier spring.

The recoil spring and Firing pin spring have a relationship. Insufficient FP spring strength will leave teardrop shaped marks on the primer as the pin still protrudes when unlocking occurs
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Old 08-07-2015, 11:02 AM   #4
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Quote:
Originally Posted by robocop10mm View Post
Insufficient FP spring strength will leave teardrop shaped marks on the primer as the pin still protrudes when unlocking occurs

Thanks for sharing, I didn't know about the teardrops.
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