Build Your
Perfect
AR-15

Pick parts. Check compatibility. Compare prices across retailers. Save and share your build.

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Sample BuildCompatible

Lower Receiver

Aero M4E1 Stripped Lower

$89

Upper Receiver

Aero M4E1 Assembled Upper

$99

Barrel

Ballistic Adv. 16" Hanson

$179

BCG

Toolcraft Nitride BCG

$79

Handguard

Midwest Industries 15"

$159

5 of 14 parts$605 total

8,400+

Parts

1,400+

Complete Rifles

Retailers

State Legal Guides

Compatibility Engine

Real-time validation catches incompatible parts before you buy. Platform, caliber, gas system, and barrel nut checks built in.

Price Comparison

Same part, multiple retailers. Find the best deal without opening a dozen browser tabs.

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Featured Builds

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AR Pistol Build

Compact 10.5" AR pistol build with a Faxon pencil barrel. Short, maneuverable, and easy to store. Uses a pistol-length gas system for reliable cycling. No stock configuration.

$59211 parts

Bolt Carrier GroupGripBarrelGas Tube

.300 Blackout Build

Short-barreled .300 Blackout build with a 7.5" Faxon Gunner barrel. Optimized for suppressed subsonic loads or supersonic punch in a compact package. Great for home defense or truck gun duty.

$67112 parts

Bolt Carrier GroupGripStockBarrel

Budget Home Defense

A reliable, no-frills AR-15 for home defense on a budget. Proven brands, mil-spec components, and everything you need to get to the range without breaking the bank.

$69112 parts

Bolt Carrier GroupGripStockBarrel