[stlmia]

The simplest answer is hammer vs. striker - respectively

 

[SMT]

The P250 is hammer-fired pistol whereas the P320 is striker-fired (no hammer). The P250 is double action only. As such, the trigger pull is relatively long and heavy. The P320 is also double action - sort of. Racking the slide partially cocks the striker. Pulling the trigger cocks it the rest of the way and releases it. As a result the trigger pull on the p320 is lighter and shorter than the p250. Hope that helps.

 

[Cheap Shot]

The P250 has a longer trigger pull than the P320. All the ones I've seen have very smooth triggers and the pull weight is similar to the P320 (P250 is 5.5 - 6.5 lbs).

 

[Lane73]

P250 = DAO and a big hammer thingy comes back outta the frame when pressing the trigger..

P320 = striker fired awesomeness

 

[rlpryer]

P250 = DAO and a big hammer thingy comes back outta the frame when pressing the trigger..

P320 = striker fired awesomeness

There are those like myself that consider a hammer fired pistol a little safer then a striker fire. It's your call.

 

[Jerrysea]

A way to look at it if you are a revolver shooter. 250 firing without hammer pre cocked. 320 Firing with hammer pre cocked.

 

[guncurious]

Also the 320 does not support all calibers with the same FCU unfortunately.

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[stlmia]

Also the 320 does not support all calibers with the same FCU unfortunately.

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Could you clarify that a bit more? Because as far as I know, the P250 FCU doesn't either.

 

[guncurious]

Could you clarify that a bit more? Because as far as I know, the P250 FCU doesn't either.

The 9mm/.40 P320 FCU can not officially take a .45 slide, and the .45 FCU can not take 9mm and .40 slides although I've heard some people have had luck getting them to work. I thought that the same P250 FCU would work with all P250 caliber slides.

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[stlmia]

The 9mm/.40 P320 FCU can not officially take a .45 slide, and the .45 FCU can not take 9mm and .40 slides although I've heard some people have had luck getting them to work. I thought that the same P250 FCU would work with all P250 caliber slides.

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Gotcha, yea I've heard the same thing with some forum members getting it to work. But I've also heard some admitting that one of the internal safeties does not engage when you do this.

Also, I'm pretty sure the P250 .45 FCU is dedicated to the .45. Pretty sure. Maybe someone else can confirm that for us.

 

[gc70]

Also, I'm pretty sure the P250 .45 FCU is dedicated to the .45. Pretty sure. Maybe someone else can confirm that for us.

While I have no personal experience with the question, there is this instruction sheet from SIG:

In order to use your P250 .45 Auto Caliber X-Change kit on a receiver that was originally any caliber other than .45 Auto, the slide catch lever, spring and spring cap must be removed and replaced with ones supplied with the kit.

At the least, a .45 X-Change kit will work on a P250 FCU of another caliber.

 

[Cheap Shot]

The P250 fcu will work with the 22, 380, 9, 40, 357, and 45 kits. The P250 45 kit has a unique grip to hold the larger magazine just for the 45.

 

[stlmia]

The P250 fcu will work with the 22, 380, 9, 40, 357, and 45 kits. The P250 45 kit has a unique grip to hold the larger magazine just for the 45.

Good to know. I stand corrected.