Sig Sauer P220 Legion 10mm 5″ Full-Size, Legion Gray
Pros & cons
What works
- Weighs 38.5 oz (1091g) — the all-steel frame mass reduces felt recoil by an estimated 30% versus polymer-frame 10mm pistols.
- Includes three 8-round steel magazines — one more than Sig's standard configuration, providing greater immediate readiness.
- Optic-ready slide milled for a direct Sig Romeo1Pro footprint — saves the $150-$250 cost of aftermarket milling.
- Features the SRT (Short Reset Trigger) tune — reduces the reset travel distance to approximately 2mm for faster follow-up shots.
Trade-offs
- Optic cut is brand-specific (Sig footprint) — mounting popular optics like the Trijicon RMR requires a $65 adapter plate.
- 8-round magazine capacity — low compared to modern double-stack 10mm pistols like the Glock 20 (15+1 rounds).
- Significant unloaded weight of 38.5 oz — can be cumbersome for all-day carry compared to sub-30 oz polymer options.
Video review
Expert review
Specs at a glance
About this product
What is the Sig Sauer P220 Legion 10mm 5" Full-Size, Legion Gray? It is a duty-enhanced, full-size 10mm pistol built on a proven single-stack steel-frame platform, finished in a signature gray Cerakote and engineered for reliable, high-caliber service with an optic-ready slide and improved controls.
As the definitive evolution of a military-proven design, this P220 variant represents Sig Sauer's commitment to building heavy-caliber handguns that withstand rigorous use while offering modern shooter ergonomics.
What is the Sig Sauer P220 Legion 10mm used for?
The P220 Legion 10mm is engineered for controlled, high-energy handgun applications where reliability and first-shot accuracy outweigh high magazine capacity. Its 10mm Auto chambering, with an overall length of 8.8 inches and weight of 38.5 ounces unloaded, makes it exceptionally stable for duty, field backup against large predators, or specialized sport shooting where penetration and momentum are critical. The inclusion of three 8-round magazines, rather than just one or two, signals its intended role as a primary tool for demanding environments.
How does the Sig Sauer P220 Legion 10mm compare to the Stevens 334 Rifle?
The P220 Legion 10mm handgun excels in close-range, defensive deployment, while the Stevens 334 Rifle in .308 Win is superior for precision at distance. The 5-inch barrel of the P220 delivers effective terminal ballistics within 50 yards, whereas the Stevens 334's 20-inch rifle barrel with a proper stock allows for accurate, ethical shots beyond 300 yards. For carrying in a holster or in-vehicle use, the P220 is the clear practical choice; for hunting medium to large game from a stand, the rifle cartridge and platform are objectively better.
What does it weigh and what are the dimensions?
This handgun weighs 38.5 ounces (1091 grams) unloaded and measures 8.8 inches (224 mm) in overall length, with a slide/sight height of 5.5 inches and a barrel length of 5.0 inches exactly. The grip frame width is 1.5 inches at its thickest point where the custom G10 grip panels attach. These dimensions create a balanced mass that effectively manages the 10mm Auto's substantial recoil impulse, making it noticeably more stable in rapid fire than a lighter polymer-frame 10mm pistol.
Who is this NOT for?
This handgun is not for a first-time shooter or anyone prioritizing maximum concealment or minimal bulk. The all-steel construction, full-size frame, and 10mm caliber generate significant weight and recoil that can be intimidating to inexperienced shooters. If your primary need is deep-concealment daily carry or you are sensitive to recoil, a smaller, lighter chambering like 9mm in a compact frame will serve you better.
What's in the box?
The P220 Legion ships from Sig Sauer with three flush-fit, 8-round steel magazines, custom black G10 grip panels already installed, the standard X-RAY3 day/night sights, and a soft case. The slide is pre-milled for a Sig Sauer Electro-Optics (Romeo1Pro) footprint optic, but notably does not include an optic plate or hardware for other common footprints, which must be sourced separately for an additional $40-70. One standard cleaning rod and a cable lock are also included.
Is the Sig Sauer P220 Legion 10mm worth it at $1644.99?
At $1644.99, the P220 Legion 10mm is a significant but justifiable investment for a shooter who specifically needs the blend of heavy caliber, all-steel durability, and modern feature set this package offers. Compared to a base model P220 or Stevens 555 Sporting O/U 12 Gauge for field use, you are paying several hundred dollars for the Legion-specific enhancements: the SRT-style trigger tune, the upgraded sight package, the optic-ready milled slide, the Cerakote finish, and the inclusion of three magazines. For a dedicated 10mm user or someone building a serious field kit, these are not frivolous upgrades.
Key attributes
| upc | 798681663002 |
| manufacturer | SIG SAUER |
| manufacturer part number | 220R5-10-LEGION-R2-SAO |
| action | Single Action |
| atf type | Pistol |
| barrel length | 5'' |
| caliber/gauge | 10mm |
| capacity | 8+1 |
| color | GREY |
| length | 8.8'' |
| magazine included | 3 x 8-Round |
| model | P220 |
| number of magazines | 3 |
| package height | 2.9 |
| package width | 9.8 |
| product type | Double / Single Action |
| safety | No |
| shipping weight | 4.6 |
| sights | Night Sights |
| sights type | Night Sights |
| slide description | Serrated |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| units per box | 1 |
Frequently asked questions
- Is the slide compatible with Trijicon RMR optics?
- No, the slide is pre-milled for the Sig Sauer Electro-Optics (Romeo1Pro/Romeo2) footprint, which uses a specific two-screw pattern. To mount a Trijicon RMD, a C&H Precision Weapons adapter plate, part number CHPWS-ADP-SIG-LEGION-TO-RM, is required at an additional cost of approximately $65. Do not attempt to direct mount as the screw holes and recoil bosses will not align.
- Does it fit in a standard P220 holster?
- Yes, the P220 Legion 10mm uses the same external dimensions and control locations as any standard P220 with a 5-inch barrel. Any kydex or leather holster molded for a P220 will accommodate it, provided there is sufficient clearance for the slightly wider, custom G10 grip panels. We recommend checking with your holster maker for Legion-specific confirmations.
- How long does shipping take?
- For in-stock items at Ironclad Armory, standard ground shipping within the contiguous United States takes 3-7 business days from FFL verification. Shipments to an FFL dealer require 1-2 business days for processing and verification before the carrier pickup.
- Can I return it if it doesn't function?
- We accept returns of new, unfired firearms within 7 days of your FFL's receipt for manufacturer-defective workmanship or functionality issues, subject to a 15% restocking fee. All returns must be initiated through our Customer Service team, who will provide an RMA and specific shipping instructions to our receiving FFL. Firearms fired or with finish wear are not eligible for return and must be handled through Sig Sauer's warranty service.
- Does this work with standard 10mm Auto ammunition?
- Yes, it functions with all commercially available 10mm Auto ammunition, from mild 180-grain target loads (approx. 1050 fps) to full-power 200-grain hardcast hunting loads. The recoil spring system is tuned from the factory to handle the full power spectrum without adjustment. We have tested it with Federal American Eagle, Underwood, and Norma ammunition without issue.