SIG Magazines
Factory SIG Sauer / Mec-Gar Factory OEM / ETS • P226 / P228 / P320 / SP2022 • 9mm / .40 S&W
SIG Sauer — the Swiss-German firearms lineage founded in 1853 and now headquartered in Exeter, New Hampshire — is one of the most commercially significant service-pistol manufacturers in the Western world. The P226 (US Navy SEAL Mk 25, FBI), P228 (US military M11 issue 1989–2019), P320 (US Army M17/M18 winner of the 2017 Modular Handgun System program), and P365 (the 2018 pistol that redefined the pocket-carry capacity category) anchor SIG's modern lineup. Keep Shooting carries factory SIG Sauer OEM magazines plus Mec-Gar factory-OEM and ETS aftermarket alternatives for the P226, P228, P320, and SP2022 platforms.
About SIG Magazines at Keep Shooting
Keep Shooting carries five SIG Sauer magazines covering four of the platform's most important service pistols — the Mec-Gar SIG P226 .40 S&W 13-round ($30.39) and SIG P228 9mm 15-round ($30.18) factory-OEM-equivalent magazines, the factory SIG P320 21-round coyote-finish magazine ($55.10), the ETS P320 21-round translucent magazine ($24.26), and the factory SIG SP2022 magazine ($55.10). SIG Sauer is the Swiss-German firearms lineage that now dominates modern US military service- pistol procurement — the P228 served as the M11 from 1989 to 2019, and the P320 won the 2017 Army Modular Handgun System competition as the M17/M18.
SIG Sauer is the commercial brand formed in 1976 through a partnership between Schweizerische Industrie Gesellschaft (SIG) — the Swiss industrial conglomerate founded 1853 in Neuhausen am Rheinfall, Switzerland — and J.P. Sauer & Sohn, the German firearms manufacturer founded 1751 in Suhl, Germany and later relocated to Eckernförde. The SIG Sauer alliance combined Swiss precision engineering heritage with German manufacturing infrastructure to produce a series of service pistols that have shaped modern law-enforcement and military sidearm procurement across 49 years of continuous production. Today, the dominant production facility is SIG Sauer Inc. in Exeter, New Hampshire — the US subsidiary that has grown since the 2000s into the primary production source for US-market SIG pistols and the world's most commercially successful subsidiary of the original Swiss-German parent.
The SIG P226 (introduced 1984) was SIG's entry to the US Army's XM9 pistol trials — the competition that would replace the Colt 1911A1 as the standard US military sidearm. The XM9 trials ended in 1985 with the Beretta 92 winning on cost (becoming the M9 service pistol), but the P226 proved itself in the reliability testing — zero malfunctions in the 7,000-round durability trial where several competitor pistols broke. The P226 subsequently became the standard sidearm of the US Navy SEALs (designated Mk 25, adopted 1988, still in active service), the FBI (issue pistol from the late 1980s through the 1990s), the British SAS and SBS special operations units, and dozens of other Western special operations and federal law-enforcement agencies. The traditional double-action / single-action (DA/SA) trigger architecture of the P226 — with a decocker rather than a manual safety — became the template for the subsequent SIG classic lineup (P228, P229, P230, P232, P239).
The SIG P228 (introduced 1989) is the compact variant of the P226 — same DA/SA fire- control architecture, same magazine well, same manual-of-arms, but in a shorter slide and grip for concealed- carry and officer-sidearm use. The P228 was adopted by the US military as the M11 pistol in 1989 for issue to officers, military police, counterintelligence agents, and aircrew — the compact alternative to the full- size Beretta M9. The M11 remained in US military service until being gradually phased out starting in 2019 as the M18 (SIG P320 Compact variant from the 2017 MHS competition) replaced it. Hundreds of thousands of M11 pistols cycled through US military service across those 30 years; many have entered the civilian secondary market via DOD surplus channels. The Mec-Gar SIG P228 15-round magazine in Keep Shooting's catalog is the factory-OEM-equivalent replacement magazine for both the commercial P228 and the military-surplus M11.
The SIG P320 (introduced 2014) was SIG Sauer's first major striker-fired polymer service pistol — a direct architectural departure from the company's 30-year DA/SA hammer-fired heritage. The P320 uses a fire-control unit (FCU) that is itself the serialized firearm, with the grip frame / slide / barrel treated as accessories — a modular architecture that allows a single FCU to be configured as full- size, compact, subcompact, or carry by swapping the grip module. The P320 won the US Army's Modular Handgun System (MHS) competition in January 2017, beating out the Glock 19X (Glock's competition entry) on both cost and features. Adopted as the M17 (full-size) and M18 (compact), the P320 replaced the Beretta M9 and SIG M11 as standard US military issue — the largest American military sidearm contract in 30 years. The P320 / M17 / M18 architecture is the current US military standard across all service branches as of 2025.
The P320's 21-round magazine ($55.10 factory, $24.26 ETS aftermarket) is the extended full-size magazine for the P320 X-Five competition variant and M17 service pistol — the largest commercial 9mm capacity in the P320 lineup. Factory coyote-finish coordination matches the M17's factory FDE Cerakote finish for shooters who want matching-color magazine floorplates. The ETS 21-round translucent polymer variant delivers comparable capacity at less than half the factory pricing — ETS (Elite Tactical Systems, Sevierville, Tennessee) is the aftermarket translucent-polymer magazine specialist covering Glock, Ruger, and SIG platforms.
The SIG P365 (introduced 2018) is the platform that redefined the American pocket-carry market — a 9mm subcompact with 10+1 capacity in a frame envelope historically associated with 6- or 7-round single-stack .380 pocket pistols. Sig engineered a proprietary staggered-column magazine geometry narrow enough to fit the pocket-pistol grip frame while doubling the capacity of contemporary single- stack 9mm subcompacts. The P365's disruption drove every major manufacturer to match the new standard: Smith & Wesson Shield Plus (2021), Springfield Hellcat (2019), Glock 43X (2019), and the Ruger Max-9 (2021) — see our Ruger LCP Max Magazines category for Ruger's response.
The SIG SP2022 (introduced 2004) is SIG Sauer's polymer-frame DA/SA service pistol — the successor to the 1997 SIG Pro 2340/2009 series. The French Gendarmerie adopted the SP2022 as its standard service sidearm in 2003 (the "2022" designation reflects the 20-year service contract — production from 2003 through 2022), replacing the MAS G1 / Beretta 92 combination in French police service. The SP2022 is chambered in 9mm, .357 SIG, and .40 S&W with a traditional DA/SA trigger and decocker. Keep Shooting carries factory SIG Sauer SP2022 magazines for the civilian-market platform.
The Mec-Gar OEM relationship. Mec-Gar (Mec-Gar S.r.l., Gussago, Italy, founded 1965) is the world's largest pistol-magazine manufacturer and the factory OEM supplier for SIG Sauer — the P226, P228, P229, P239, and many other SIG pistols ship from the factory with Mec-Gar-manufactured magazines inside. Mec-Gar magazines for the SIG platforms are, functionally and dimensionally, the same magazines SIG factory ships — same tooling, same factory, same specifications, produced in Gussago and supplied to SIG as factory OEM. When Keep Shooting carries a Mec-Gar SIG P226 or P228 magazine, the magazine is factory-OEM-equivalent at typically lower pricing than the SIG-branded packaging. For Mec-Gar's complete factory-OEM lineup covering SIG, Beretta, S&W, CZ, Springfield Armory, and FN, see our Mec-Gar brand page.
SIG's civilian market position covers several distinct buyer profiles. Retired military personnel — M11 (P228) owners from 1989–2019 service, and increasingly M17/M18 (P320) owners from current service — form a substantial SIG ownership cohort with service-era familiarity driving continued civilian platform loyalty. Federal and state law enforcement personnel — current or retired FBI, state police, and federal agencies that issue or issued SIG platforms represent a similar service-era cohort. Concealed-carry users — the P365's 2018 arrival moved SIG from service-pistol brand into the pocket-carry mainstream, and the platform has become one of the most popular CCW pistols in the US market alongside the Glock 19. DA/SA traditionalists — shooters who prefer SIG's classic-series hammer- fired architecture over the modern striker-fired market remain a committed if declining cohort served by the P226, P229, and SP2022 platforms. Competition shooters in USPSA Production and Carry Optics divisions often run P320 X-Five or P226 Legion variants.
Keep Shooting ships all SIG magazines from our Pennsylvania warehouse with free shipping on orders over $49.95 and hassle-free returns. Magazine shipments comply with destination-state capacity restrictions — the 13-round P226 .40 S&W and 15-round P228 9mm magazines will not ship to California, New York, New Jersey, Massachusetts, Hawaii, Colorado, Washington, Oregon, Illinois, Vermont, or Washington DC; the 21-round P320 magazines similarly require verification in capacity-restricted states (state-level rules vary — verify before ordering). Whether you're a P228 / M11 owner rebuilding magazine inventory for a former-service pistol, a P226 Mk 25 civilian owner stocking spare magazines for your Navy SEAL- heritage sidearm, a P320 M17 shooter running factory coyote-finish extended magazines at the range, a Gendarmerie- heritage SP2022 collector, or an ETS- equipped budget-minded P320 range shooter, every SIG magazine in our catalog is verified to feed the SIG Sauer platform reliably and is backed by its respective manufacturer's warranty.
Frequently Asked Questions — SIG Mags
Keep Shooting carries a wide selection of SIG Mags products from trusted brands. Browse our catalog to see the full range, and use the filters on the left to narrow by brand, price, or product type.
Yes! All orders over $49.95 qualify for free shipping, including SIG Mags products. Orders typically ship within 1–2 business days.
Keep Shooting offers hassle-free returns on SIG Mags products. If you're not completely satisfied, contact our customer service team for a return authorization. All products must be in original, unused condition.
If you need help choosing the right SIG Mags product, our team is available to assist. Check individual product descriptions for detailed specifications, or contact us directly and we'll help you find the best fit for your needs.