Does anyone know if there's an already optic cut P320 .40/.357 SIG slide available? I know I can send it out to get milled, but I would like to have both versions (stock and RDO ready). Thanks!

While I have no done it personally, you should be able to use a 9mm slide with said RDS toss in your .40S&W barrel and it will work.

The 357 SIG and 40 S&W P320 barrels have a larger outside diameter than the 9mm barrel and therefore will not fit into a 9mm slide. (Yes, I just checked to make sure. )

quote:

Originally posted by Fire Away:
Does anyone know if there's an already optic cut P320 .40/.357 SIG slide available? I know I can send it out to get milled, but I would like to have both versions (stock and RDO ready). Thanks!

I’m not aware of SIG or any aftermarket pre cut optics slides in .40/357.

Re: milling, be aware sone of the older model 320's have a deep channel cut underneath/rear section of the slide and cannot be milled for optics.

quote:

Originally posted by HCM:
Re: milling, be aware sone of the older model 320's have a deep channel cut underneath/rear section of the slide and cannot be milled for optics.

That’s something to possibly be aware of, but I believe it’s true only of 9mm P320 slides. Removing metal from inside stainless steel 9mm slides is something that SIG has long done, evidently to lighten the slide as compared with slides for 357 SIG, 40 S&W, and 45 ACP. In any case I just checked two three full size 357/40 slides, including one on a pistol acquired seven years ago, and none has the lightening channel.

9mm slide on left; 357/40 slide on right:





If I were purchasing a 357/40 slide used, and that’s probably the only way it would be possible these days, I’d ask for a photo of the underside just to be sure, but I doubt it’s something to be concerned about.

This message has been edited. Last edited by: sigfreund,

Shows out of stock. But email them and they will set you up. They did with me. They also have other designs.