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EDC: SIG P938.
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ALSO, to fire "lesser" .45 acp rounds I just need to easily switch
to a 18.5 recoil spring.

With the mods made to the mainspring and FPS, for full-power .45 ACP you might try a 14# recoil spring.
 

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I have been wanting to convert one of my .45s to 45 super I have also been thinking about building an Ar15 in 45 super
That would be interesting. I thought I wanted a 10mm AR, but there never seemed to be a good hi-cap mag readily available.
An AR in Super might just need a different buffer?
 

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.45 Super cases do have .45 SUPER stamped on them . . .

There was another cartridge that was very similar to .45 Super, but the cases used small primers. That was another means of helping ensure that cases and loads didn't get mixed-up, but, we now have ACP cases with small primers, so, we're back to reading headstamps.

If you fired a .45 Super round in a Commander, you'd certainly know it, and I'd hope you did some investigating before firing another.
 

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.45 Super is not the choice for fast, controlled pairs.
The whole point of standard-pressure .45 ACP is excellent terminal ballistics without a lot of muzzle blast or recoil.
I'd never choose .45 Super as an anti-personnel round; for a "woods walk" gun, it would be near the top of my list.
 
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