P320 Modern Classic Slide, 4.7” Bull Barrel

(5 customer reviews)

$950.00

Custom Modern Classic P320 slide designed by Bruce Gray and the Grayguns team. This slide features a refined, classic look that complements the modern design of the SIG Sauer® P320. This is the custom 4.7-inch fitted bull barrel version designed by our team. It is optimized for USPSA Carry Optics.

Includes custom slide, custom-designed and fitted 9mm bull barrel, Grayguns Guide Rod and Spring, and all internals. Options available will vary, including your choice of DLC or bead blast finish. The bead-blasted slide shown is a representation of the finish. New photos are coming soon.

Ensure you read the full description below before ordering.

Looking for an optic or sights for your custom slide? Order your choice of optic or sight package and we'll professionally install the optic for free!
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Description

Our custom Modern Classic P320 4.7-inch slide package focuses first on the weight and balance of the slide. We’ve introduced a traditional 1911 spin with utility-driven serrations in strategic areas. Available in a Black Diamond-Like Carbon (DLC) or bead blast finish. Each custom slide features the iconic Grayguns logo.

Design & Functionality

“Factory barrel-fit dimensions are dictated by the possible, wide dimensional extremes between FCUs and slides. Drop-in aftermarket barrels are reverse-designed from factory dimensions as a starting point and are thus even “looser.” As a result, you see a lot of pre-lock jams, failure-to-feeds and accuracy issues from barrels that may look pretty but don’t fit or shoot worth a hoot. Few P320s deliver the accuracy of which they are capable.

I designed our barrels to eliminate gross vertical slop when out of battery for reliable feeding and function. We individually fit each of our barrels to the slide it’s serialized for a minimum clearance working fit in all axes. They group exceptionally well. In addition, our lockup values yield a softer recoil impulse and smooth sight return, with greatly enhanced durability. Nothing else available compares.”

Bruce Gray
President, Grayguns

Bruce Gray

Differences between the Lockwood and Modern Classic 4.7″ Bull Barrel Slides

In short, the primary difference is simple aesthetics, but Bruce Gray writes more about the slides in this post.

Package Includes

  • Custom Grayguns Modern Classic designed slide
  • Your choice of Black Diamond-Like Carbon (DLC) or bead blast finish
  • Grayguns Guide Rod with Recoil Spring
  • A custom Faxon bull barrel manufactured to Grayguns specifications and hand-fitted for the 4.7-inch slide length.
  • OEM internals (Ejector, Striker Assembly, and Slide Cap)
  • Choice of optic cut or OEM dovetails only

Different P320 XFive Slght PlatesGrayguns P320 Slide – 4.7-inch – Additional Information

You can directly mount one of our red dot options to the slide. There is no need for an adaptor plate.

Our Grayguns Lockwood 4.7″ slides cut for the Romeo1 Pro have factory P320 XFive Legion optic cuts that will fit the newest adjustable rear sight plate, an OEM feature of the P320 XFive Legion pistol.

SIG changed the design of the sight plates when they introduced the P320 XFive Legion. Our slide cut for the Romeo1 Pro will only fit the XFive Legion adjustable rear sight base. Components can be mixed and matched, so you must check your slide and sight plate. Our Romeo1 Pro slides will fit the plate shown on the left.

The FTP Alpha 3 will not fit our slides. Although the hole pattern is the same as a Romeo3 Max, the footprint of the FTP optic is too long.

Additional information

Weight N/A
Package Dimensions N/A
Slide Configuration

Cut for Romeo3 Max, DLC Finish, Cut for Romeo1 Pro, DLC Finish, Cut for Trijicon RMR, DLC Finish, Cut for Aimpoint ACRO P-2, DLC Finish, Cut for Romeo3 Max, Bead Blast Finish, Cut for Romeo1 Pro, Bead Blast Finish, Cut for Trijicon RMR, Bead Blast Finish

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5 out of 5 stars

5 reviews

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What others are saying

  1. Arthur Walker

    GigaFudd Part II

    Arthur Walker (verified owner)

    I saw my friend Rob Lamen’s Lockwood slide at the club and I knew I wanted one too. Once I got on the Grayguns website I saw this Modern Classic slide. Now I start going back and forth between the two choices. I read what Bruce wrote about what was the difference between the two and immediately went to my safe and looked at an identical model of the first pistol I ever fired over 50 years ago. I now have a little bit of nostalgia with me when the USPSA matches start back up in the spring but with a very accurate and reliable pistol. After zeroing in the dot I was able to put every shot in that little back circle on the B2 NRA slow fire target.

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  2. adaggit

    Must have for Competition Shooters

    adaggit (verified owner)

    This will solve all of your accuracy problems with the P320. Just shot a 2″ group at 25 yards, anything closer and the bullet holes will all touch. Unbelievable accuracy and hands down the best slide for the P320. The 4.7″ does have a different feel than the 5″. I can’t decide which one I like more so Im still working with them both. Either one delivers the accuracy you would expect.

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  3. blakelyaci

    Great machining and craftsmanship.

    blakelyaci (verified owner)

    I heard a lot of good things about Grayguns from other friends of mine in IDPA and USPSA, so I thought I would purchase one of their slides and judge for myself. They did not disappoint. Very nice machining and a nice tight barrel lockup. I put on my Romeo 3 max optic and went to the range and burned 200 rounds through it. I used 130 power factor ammo with a 12.5 lb recoil spring. It shot very flat with no hiccups. Looks like this found a permanent home in my range bag. Thank you Grayguns!

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  4. One person found this helpful
    frostadams

    I thought it was me

    frostadams (verified owner)

    Then I bought this slide for my Legion frame and SIG FCU and was dialed in. Customer service is great and the product is ready to go right out of the box. It’s tight when you get it, but a couple of hundred rounds and it’s a sewing machine. I did like the GrayGuns #12.5 lb spring that my buddy Rob recommended over the included one, I think#14.5. Can’t wait for my first USPSA match with this one.

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  5. One person found this helpful
    edward ah toong

    Very accurate

    edward ah toong (verified owner)

    While I only have less than two hundred rounds through my modern classic, 4.7″ bull barrel, I must say that its accuracy is great. I was testing it to work out loads for carry optics class, I shot it at 25 yards for accuracy. Sub 2″ groups are easy off a rest, some approaching 1″. I have to admit that it is as accurate as my Atlas Gunworks pistols and that is saying a lot. Thank you Grayguns.

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Disclaimer

Many parts sold by Grayguns - including but not limited to triggers, trigger kits, internal components and spring kits - are intended for installation by a qualified armorer or gunsmith who is familiar with the firearm.

Although kits fit with no issues in a great majority of pistols, Grayguns cannot guarantee perfect functionality in every instance.

Due to varying tolerances present in all mass-produced firearms, professional fitting by a qualified armorer who is familiar with the pistol's action may be required.

Grayguns offers installation services for all parts kits we offer. If you have any issues or questions about the installation process, STOP IMMEDIATELY and contact the Grayguns Customer Service Team.