Description
The Sig Sauer P320 SXG Max 21 Round replaces the polymer grip module with machined stainless steel, which is the single biggest change anyone has made to the P320 platform. MAG5 Firearms stocks it with a 5-inch match bull barrel, Hogue aluminum panels, twenty-one rounds and a ROMEO3 MAX already mounted.
Why a Stainless Grip Frame Changes Everything
SXG stands for stainless grip, and the weight it adds sits low in the hand where it does the most good. Lowering the center of gravity stops the pistol rotating under recoil far more effectively than anything done to the slide.
The result on the Sig Sauer P320 SXG Max 21 Round is a striker-fired pistol that tracks like a steel-framed competition gun, because that is effectively what it is.
Sig Sauer P320 SXG Max 21 Round Match Grade Bull Barrel
A bull barrel carries mass at the muzzle where it damps rise, and the thicker profile resists the whip thinner contours develop through a long string of fire.
Match-grade tolerances tighten groups against the same ammunition a service barrel would shoot. At five inches the Sig Sauer P320 SXG Max 21 Round also has the longest sight radius in the P320 family.
Sig Sauer P320 SXG Max 21 Round Specifications
| Manufacturer | SIG SAUER |
|---|---|
| Model | P320 SXG MAX |
| Part Number | 320SXG59MAXM |
| Caliber | 9mm Luger |
| Capacity | 21+1 Rounds |
| Barrel Length | 5 inches |
| Barrel | Black Match Grade Bull Barrel |
| Slide | Black Nitron Stainless, Optic Ready, Serrated |
| Grip Frame | Matte Stainless Steel with Accessory Rail |
| Grip Panels | Hogue Aluminum |
| Optic Included | SIG ROMEO3 MAX, 6 MOA |
| Action | Striker Fired |
| UPC | 798681704873 |

The Included ROMEO3 MAX
A 6 MOA dot is deliberately large. On a competition gun the priority is finding the dot instantly on the draw and on transitions, not shooting sub-inch groups at distance.
Because the optic ships mounted on the Sig Sauer P320 SXG Max 21 Round, there is no footprint research, no plate to order and no discovering afterward that the irons no longer line up.
Sig Sauer P320 SXG Max 21 Round Capacity and Competition Use
Twenty-one rounds means fewer reloads on a stage and fewer magazine changes during practice. P320 magazines are widely produced and inexpensive.
An accessory rail is present as well, which is unusual on a dedicated competition pistol and makes this one more versatile than a pure race gun.
Availability and Transfer
MAG5 Firearms is a licensed FFL dealer in Pennsylvania. This pistol ships new in the factory case with magazines, the optic installed and documentation, transferred through your local FFL.
A ten-round version of this same pistol is cataloged separately for capacity-restricted states.
Other Sig Sauer P320 SXG Max 21 Round configurations and competition pistols are listed in our handgun catalog. Factory specifications are published by SIG SAUER.
Every Sig Sauer P320 SXG Max 21 Round sold by MAG5 Firearms ships new in the factory packaging with the accessories SIG SAUER includes, and transfers to your chosen FFL. The Sig Sauer P320 SXG Max 21 Round is a regulated firearm and we verify licensing before any order leaves the shop.






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