Shop our selection of Sig Sauer firearms, including the P365, P320, P226, M400 Tread, and MCX Spear. Iron Horse Armory offers premium Sig Sauer firearms engineered for military-grade reliability, refined ergonomics, and modular versatility, serving everyday carriers, law enforcement, competitive shooters, and tactical professionals who demand precision-built platforms backed by a legacy of innovation and trusted real-world performance. Browse our semi auto handguns, AR rifles, and handgun magazines to round out your carry or range setup. We also stock semi auto rifles, bolt action rifles, scopes sights and optics, handgun ammunition, and gun parts to keep every shooter fully equipped with dependable gear and quality accessories.
Shop Sig Sauer firearms and optics online by comparing models, checking current availability, and reviewing specifications such as caliber, capacity, barrel length, and sight configuration.
Use the following tips to find the right Sig Sauer platform for duty, concealed carry, hunting, or precision shooting:
Buy Sig Sauer products online or visit the gun shop in Parker, Colorado for hands-on time with the brand’s pistols, rifles, and optics. Iron Horse Armory proudly serves customers from nearby cities like Castle Rock, Franktown, Centennial, and Lone Tree, with knowledgeable staff ready to help match a Sig product to your goals.
Federal law requires that all firearm purchases from a licensed dealer be processed through ATF Form 4473 with a NICS background check, with handgun buyers required to be at least 21 and long gun buyers at least 18. Colorado adds a state background check fee, a three-day waiting period on firearm transfers, and a magazine capacity limit of 15 rounds, which applies to most Sig pistol and rifle magazines sold in state.
Carry concealed only with a valid Colorado Concealed Handgun Permit, and transport firearms unloaded and cased when traveling to and from the range. Store your Sig in a locked safe, lockbox, or with a trigger lock when not in use to comply with Colorado’s secure storage laws, and contact the store directly with questions about specific Sig models, optic compatibility, or NFA-related items.
Sig Sauer is best known for producing high-quality pistols and rifles used by military, law enforcement, and civilian shooters worldwide, including the U.S. Army’s M17 and M18 service pistols based on the P320 platform. The company also produces ammunition, electro-optics, suppressors, and airguns under the Sig Sauer brand.
The P320 is a full-size to compact modular striker-fired pistol with a removable fire control unit, available in calibers from 9mm to .45 ACP. The P365 is a micro-compact concealed carry pistol designed for high-capacity 9mm carry in a slim, lightweight frame.
Most Sig Sauer firearms sold in the United States are manufactured at the company’s facilities in New Hampshire, including the P320, P365, MCX, and Cross rifle lines. Some legacy and specialty models continue to be produced in Germany and assembled in the U.S.
Sig Sauer firearms are legal to own in Colorado for adults who meet age requirements and pass a federal background check. Buyers must also comply with the 15-round magazine capacity limit and the three-day waiting period on firearm transfers.
The MCX Spear is the civilian version of Sig’s XM7, the rifle adopted by the U.S. Army as part of the Next Generation Squad Weapon program. It is chambered in .277 Fury (6.8x51mm) or .308 Winchester and uses a short-stroke gas piston operating system.
Many Sig pistols, including the P320 X-series, P365 X-series, and P229 Pro, are offered in optics-ready configurations with milled slides for direct or plate-mounted red dot sights. The Romeo line of red dots from Sig Sauer Electro-Optics is designed to pair directly with these platforms.
Sig Sauer produces a full line of centerfire pistol and rifle ammunition under its Elite Performance brand, including FMJ, JHP V-Crown defensive, and match-grade loads. The company also produces specialty calibers like .277 Fury and .300 BLK in subsonic and supersonic configurations.
Field-strip the firearm and clean the bore, slide rails or bolt carrier, and trigger components with quality solvent and lubricant per the owner’s manual. Periodically inspect recoil springs, optic mounting screws, and trigger group components to maintain reliability and accuracy across the Sig Sauer product line.
