Sig P226 40 to 9mm conversion

[g4pi09]

Is it possible to convert a p226 from 40 to 9 with just a simple barrel and recoil spring swap or is that not recommended? I can’t find the 226 caliber xchange kits anywhere. Thanks

[rathos]

barrel and recoil spring won't work. You need the 9mm slide as well.

[claymore504]

You could build it using parts. Here are some slide options

https://www.midwestgunworks.com/sig-sauer-p226/slide.html

[rathos]

I bought an upper from these guys a bit ago for my P229 to convert it to a 9mm red dot gun. They have a MK25 assembly for the 226 right now:

https://www.matrixprecisionparts.com/sigparts/nd22b7mfnsbs4htnspdqpj3z0utgtp

[Mark D]

I can't speak to the 226, but I dropped a 9mm conversion barrel into my .40 S&W 229 and it ran fine. Didn't put a lot of rounds through the pistol before trading it, but had no issues. Didn't change mags or springs. YMMV. Conversion barrel was from Bar-sto.

[HCM]

Is it possible to convert a p226 from 40 to 9 with just a simple barrel and recoil spring swap or is that not recommended? I can’t find the 226 caliber xchange kits anywhere. Thanks


barrel and recoil spring won't work. You need the 9mm slide as well.

Sort of. You can’t drop a standard 9mm 226 barrel into a .40 slide.

You need either a complete 9mm slide assembly or a dedicated 40-9 conversion barrel. The 40-9 conversion barrel differs in that it has the external dimensions of .40 cal barrels.

Barsto and others make 40-9 conversion barrels for the SIG 226 and 229.

https://www.topgunsupply.com/bar-sto-conversion-barrel-sig-p226-9mm.html

I have a Barsto 40-9 barrel for my 229. For range purposes it works just fine with the 40 Cal recoil spring and 40 Cal magazines.

For any kind of serious use I would probably just invest in a complete slide assembly.

[Fordtough25]

Sort of. You can’t drop a standard 9mm 226 barrel into a .40 slide.

You need either a complete 9mm slide assembly or a dedicated 40-9 conversion barrel. The 40-9 conversion barrel differs in that it has the external dimensions of .40 cal barrels.

Barsto and others make 40-9 conversion barrels for the SIG 226 and 229.

https://www.topgunsupply.com/bar-sto-conversion-barrel-sig-p226-9mm.html

I have a Barsto 40-9 barrel for my 229. For range purposes it works just fine with the 40 Cal recoil spring and 40 Cal magazines.

For any kind of serious use I would probably just invest in a complete slide assembly.


This exactly, I used to have a PD trade in 226 with a 40-9mm conversion barrel, shot just fine plinking.

[Sammy1]

I bought a Mk25 slide assembly dirt cheap on sale. Keep an eye out for 226 9mm complete slide assemblies on sale.