GGP320 Slides

13 reviews Write a Review

Due to the change in laws we are no longer able to ship to WA

The adoption of the P320® platform by the U.S. Military, as well as many Law Enforcement agencies, professional lead farmers, competition shooters, and firearm instructors led to the development of a new line of GGP aftermarket slides. After all, the P320’s ability to be custom tailored to the individual user’s preferences in grip length, grip size, as well as slide length and sight radius are all highly desirable features. Why stop there, when you can have even more customization options when upgrading to a drop-in GGP320 slide. 

Just like our GGP17/19 and SPG43 slides, these GGP320 slides offers enhanced aesthetic features, increased grip serrations and an improved coating without compromising function. We also took our hybrid MRDS optic cut and added a third option, the SIG ROMEO1. Now you have to option to use a ROMEO1 as well as a Trijicon RMR or Leupold DeltaPoint Pro right out of the box without using bulky adapter plates that only raise the optic further above the bore axis. Available in Grey or Black DLC finish for corrosive and abrasion resistance, the GGP320 will also be available in FDE Cerakote. The GGP320 is a drop-in install that comes with all the enhancements that professional handgun shooters have come to expect from Grey Ghost Precision.


  • Stripped slide machined from 416 Stainless Steel for tighter-than-factory-tolerances

  • Available in Black and Grey DLC (Diamond Like Coating) or FDE Cerakote

  • 9mm Compatible only

  • Optic cut compatible with Leupold DPP, Trijicon RMR and SIG Romeo1 and Romeo1Pro (if the slide was made after January 1st 2021) and supplied screws/shim plates

  • Not Compatible with Vortex or Aimpoint Optics
  • Includes G10 Cover Plate when not running an optic

  • Version 1 Slide Pattern with aggressive serrations an window cuts

  • Compatible with SIG P320® Full-Size and X-Five* grip modules
    *X-Five barrels are not compatible with GGP320 slides due to its profile. Please use a standard full size 320 barrel.

  • Optics not included

  • Completion parts not included

  • To be used with brass, factory loaded ammunition 

Full Size | 8.84 oz



GGP320 Version 1 available in Full-size, with finishes in Grey DLC, Black DLC, and FDE Cerakote.


Please Note : All sights should be installed by a gunsmith. Discounted barrel offer only applies to regular priced slides and barrels (no blems) and cannot be combined with other sales and promotional offers.

“SIG” and "P320" are federally registered trademarks of Sig Sauer, Inc. and are two of many trademarks owned by Sig Sauer, Inc. Grey Ghost Precision is not affiliated with nor endorsed by Sig Sauer, Inc.





13 Reviews

  • 1
    GGP 320 full size slide

    Posted by Jeff on Jul 19th 2021

    Garbage product and so far even worse customer service, slide cracked pretty severely while firing standard pressure duty ammo. Upon inspection it is obviously machined out of spec in the area where it cracked. That this is bad....especially if your using as a duty pistol. Its been over a month since I sent my first of multiple emails and forget trying to call.

  • 5
    320 slide

    Posted by Huffman on Mar 9th 2021

    Excellent quality, got exactly what I ordered, and customer service was great. Could not have asked for anything more.

  • 5
    P320 Slide review

    Posted by Matt on Mar 9th 2021

    Gorgeous slide, very well done! Fit and finish are great, slightly different and smaller overall dimensions from the stock slide on an m17 but that is a good thing. The ability to select multiple RDS makes it even better. Glad I made the purchase, GGP did a great job on this one.

  • 5
    High quality slides

    Posted by Tyler Ziel on Feb 20th 2021

    Slides are great. Machining is clean and the finish is good. No reliability issues so far with about 4k rounds down range. Ive only mounted RMRs to my compact and full size slides but thier were no issues with fit. My only complaint is they come with allen screws instead of torx. While I have not rounded them out, I fear that eventually I will seeing as I change batterys every year. All things considered, these are fantastic slides.

  • 5
    P320 V1

    Posted by Tristan on Aug 12th 2020

    Only thing I can complain about is that the screws for my RMR kept walking out but I think I got it under control. Otherwise the Cerakote looks excellent, slide cuts are super clean, and everything fits as it should..

  • 5
    P320 compact

    Posted by George on Jul 31st 2020

    As advertised, it’s bad to the bone.

  • 5
    P320C slide

    Posted by Scott on Jul 6th 2020

    First, Grey Ghost has awesome costumer service! The slide is beautiful. Paired with a Grey Ghost threaded barrel. It's a work of art. Thanks Grey Ghost for your great service. I will be a repeat costumer.

  • 5
    GGP320 Slide

    Posted by Austin Dabrowski on Jun 25th 2020

    Absolutely love this slide! Great product and great customer service! Very friendly and helpful! Will definitely be a returning customer!

  • 3

    Posted by Steve Hall on Jun 6th 2020

    This is a well machined and good looking slide. The RMR fit is tight and solid. I was not anticipating needing a shim for the RMR and the website wasn’t all that clear on that but it hasn’t been a problem. I could not find any long-term reviews online but it has functioned flawlessly so far and I have about 800 rounds through mine. The RMR screws have not backed out once. As for how it shoots, I would note that the slide gets hot fairly quickly. My personal opinion is that the slide is not that well balanced. I feel that too much material has been taken out of the front of the slide leading to muzzle rise. In other words, I have no way to verify this but I think they took out more material from the front of the slide than for the RMR cut. For the cost of the slide, I guess I was hoping it would shoot flatter for me. Overall, it looks great but I’m having some buyer’s remorse because I don’t care much for flashy looks as functionality wins the day for me. In short, I wish I would have opted for one without the window cuts. Might just be me, but that’s my honest assessment.