View Full Version : changing calibers on a 1911a

08-19-2009, 6:22 PM
Hi, my buddy has a 1911a/Colt Delta Elite in 10mm and we were wondering how hard would it be to change calibers, not permanately changing but basically having the capability of shooting 9mm or 45 auto as well as the
10mm. would he just need an alternate slide, barrel and mag? or more parts as well? Thanks for any info.


08-19-2009, 7:02 PM
slide, barrel, mag, ejector, maybe a slide stop...

08-19-2009, 7:05 PM
pretty sure you'd almost need a whole new gun

08-19-2009, 7:41 PM
not in 9mm Luger but in 9X25 Dillon.

In the mid 90's King's Guns Works had a conversion kit for the Delta: 357Sig, 40S&W and 10mm.
It came in a delux embroidered soft case with all the accoutrement for proper function.

Good luck with your endeavor.

08-19-2009, 8:03 PM
I'm sure that someone will correct me but I would expect that shooting 40S&W at least would be super easy.

Barrel and mag change...recoil spring?

Ammo availability has stayed pretty constant even with the "current political climate"..

08-19-2009, 8:37 PM
10mm to .40 = .40 barrel, a softer recoil spring and .40 mags

10mm to .45 = Complete .45 "upper", .45 mags and a .45 ejector.

08-19-2009, 8:58 PM
It depends upon the original gun.

A Springfield Armory .38 Super slide can be converted to 9mm by changing the barrel. The 9mm rounds will fit in the .38 Super mag, but they may or may not feed. It can also be changed to .40 S&W by changing the barrel. You'll need a new magazine because the .40 won't fit in the .38 Super mag.

A Caspian 10mm slide will work with a .40 S&W barrel. The 10mm mags may or may not feed, although the .40 ammo will fit in the mag.

A 10mm Colt Delta Elite barrel will fit inside a Para .40 cal slide. But it probably won't run because the .40 ejector is too long. Also, I'm not sure how well the .40 slide will hold up to 10mm. I don't think Para makes a 10mm.

I've actually tried all of these swaps with guns and parts that I own, although I've only actually fired 9mm and .40 out of the swapped out guns.

08-20-2009, 10:35 AM
thanks for all your guy's info its very helpfull, now where would one go to buy these parts?

08-20-2009, 11:05 AM
thanks for all your guy's info its very helpfull, now where would one go to buy these parts?


08-20-2009, 2:09 PM
10mm to .45 = I have this set-up and use it often.

Yes, ejectors may need to be trimmed back or replaced with extended ones depending on the case length, ejection timing and ejection port size and location.

08-25-2009, 12:20 PM
thanks guys for all the info