AR-15 Rifles
The AR-15 is the most popular rifle in America, and for good reason—it’s modular, accurate, reliable, and available in a range of calibers that covers everything from varmint hunting to home defense. Impact Guns carries AR-15 rifles from Colt, Daniel Defense, Ruger, Springfield Armory, and more in standard 5.56 NATO, .300 Blackout, .224 Valkyrie, 6.5 Grendel, and other configurations. Whether you’re buying your first AR or adding a purpose-built upper to your collection, this is the place to start.
Read our full AR-15 Buying Guide ↓
Understanding AR-15 Configurations
AR-15s come in three primary configurations: carbine (16-inch barrel, collapsible stock), mid-length (16–18-inch barrel with mid-length gas system), and rifle-length (20-inch barrel). Carbines are the most versatile and popular for home defense and general use. Mid-length gas systems reduce felt recoil compared to carbine-length gas systems on the same barrel length. Rifle-length 20-inch configurations maximize velocity from the 5.56 cartridge and offer the longest sight radius. For most buyers, a 16-inch carbine or mid-length AR-15 is the right starting point.
Caliber Options Beyond 5.56
While 5.56 NATO/.223 Remington is the standard AR-15 caliber, the platform accepts dozens of alternatives with a simple upper swap. .300 Blackout offers subsonic suppressor performance and is popular for home defense and hunting. 6.5 Grendel extends effective range significantly while remaining compatible with standard AR-15 lowers. .224 Valkyrie was designed specifically for long-range precision from an AR-15 platform. 7.62x39mm allows shooting surplus AK ammunition. For hunters, 6.8 SPC and .350 Legend offer more terminal performance at close to moderate ranges. Most buyers start with 5.56 and add specialty uppers later.
Direct Impingement vs. Piston
Most AR-15s use Eugene Stoner’s original direct impingement (DI) gas system, which is reliable, accurate, and produces less felt recoil. Piston-operated ARs (like the HK416-pattern rifles) run cooler and cleaner but add weight and cost. For a general-use AR-15, DI is the right choice—it’s what the military uses, what most competitive shooters prefer, and what the enormous AR-15 aftermarket is built around. Piston systems earn their place in specific roles: suppressed use, cold-weather reliability, and sustained high-volume fire.
Best AR-15s by Budget
At the entry level, Anderson Manufacturing and Ruger’s AR-556 offer reliable mil-spec builds at accessible prices. In the mid range, the Springfield SAINT and Ruger SFAR provide upgraded components and better triggers out of the box. At the premium level, Daniel Defense DDM4, Colt LE6920, and BCM rifles are the benchmarks for reliability-critical applications. It’s worth spending more on the lower receiver and BCG (bolt carrier group) than on furniture and accessories—a quality mil-spec lower with a nitrided BCG will outperform a cheap lower with expensive furniture every time.
AR-15 for Home Defense
The AR-15 is arguably the best home-defense rifle available. A 16-inch 5.56 carbine is easier to maneuver indoors than most people assume, produces less over-penetration risk than a 12-gauge shotgun with buckshot, and offers 30 rounds on tap with a quick magazine swap. A quality red dot or low-power variable optic (LPVO) significantly improves target identification in low light. Adding a weapon-mounted light is the most important single upgrade for any home-defense firearm. For home defense specifically, a carbine-length 5.56 AR with a light and red dot is hard to beat at any price point.
Where to Go Next
For AR-15 pistol variants, see our AR-15 Pistols page. Colt AR-15 fans can explore our Colt brand page. For 5.56/.223 ammunition, visit our .223/5.56 ammo page, and for .300 Blackout builds, our .300 Blackout ammo page.