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Browse our inventory of AR rifles from top brands such as Savage, Alex Pro Firearms, American Defense Mfg, Midwest Industries, and Mossberg. Iron Hill Armory stocks a dependable lineup of AR rifles built for sport shooting, home defense, hunting, and tactical applications, with options to suit shooters of every experience level. Round out your AR setup with rifle ammunition in a wide range of calibers, plus rifle magazines to keep you loaded for extended range sessions and gun scopes to dial in accuracy at any distance. We also carry semi auto rifles, bolt action rifles, and gun parts from a variety of manufacturers to complete your build.
Shop AR rifles online by comparing models, checking current availability, and reviewing specifications such as caliber, capacity, barrel length, and sight configuration. AR rifles are modular, semi auto platforms widely used for sport shooting, home defense, hunting, and tactical training thanks to their accuracy, customization options, and broad aftermarket support.
Here’s what to consider before buying:
Buy AR rifles online or visit our gun shop in St. James, Missouri to handle inventory in person before purchasing. Iron Hill Armory also serves customers from nearby cities including Rolla, Cuba, Salem, and Steelville.
All firearm transfers follow federal guidelines and applicable Missouri requirements, which typically involve shipment to a licensed dealer and completion of a background check prior to pickup. Shipping timelines and transfer steps can vary by product, so review checkout information carefully before placing your order.
Carry methods, transportation practices, and storage responsibilities may differ based on circumstances. Contact the shop directly for clarification on transfer procedures, accepted identification, and current store policies.
AR stands for ArmaLite Rifle, named after the company that originally developed the design. It does not stand for assault rifle or automatic rifle as is sometimes assumed.
5.56 NATO and .223 Remington are the most common chamberings for AR rifles, offering manageable recoil and wide ammo availability. Other popular calibers include .300 Blackout, 6.5 Grendel, and .224 Valkyrie.
Federal law allows ownership of AR rifles, though some states restrict configurations, magazine capacity, or specific features. Check your local and state laws before purchasing.
Yes, AR rifles are highly modular and can be built from individual parts including a stripped lower receiver, upper assembly, and small components. Building requires basic tools and an understanding of the platform.
AR-15s are typically chambered in 5.56 NATO or .223 Remington and use a smaller frame. AR-10s use a larger frame chambered in .308 Winchester, 6.5 Creedmoor, and similar full-power cartridges.
Clean your AR after each range session or hunting trip to prevent carbon buildup and maintain reliable cycling. Pay extra attention to the bolt carrier group, gas system, and chamber.
Direct impingement uses gas routed back into the bolt carrier to cycle the action. Piston systems use a separate operating rod, which runs cooler and cleaner but adds weight to the rifle.
Many AR rifles run more reliably after the first few hundred rounds as parts settle in. Refer to the manufacturer’s documentation for specific break-in recommendations.
