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Complete 2026 AR-15 buying guide. How much to spend, what to look for, build vs buy, brands to trust, first accessories, and where to buy online and locally.

Step-by-step guide to zeroing your AR-15. The 36-yard zero explained, MOA vs MIL adjustments, bore sighting, common mistakes, and how many rounds you need.

Every AR-15 caliber compared in one chart. Velocity, range, ammo cost, magazine compatibility, and best use case for .223, 300 BLK, 6.5 Grendel, and more.

Which states allow AR-15 ownership in 2026, which have feature restrictions or assault weapon bans, and how to comply with featureless and fixed-mag workarounds.

Complete AR-15 parts list with every component explained, price ranges at budget through premium tiers, and where to spend vs save on your build.

Complete state-by-state guide to AR-15 magazine capacity laws in 2026. Which states restrict magazine size, grandfathering rules, penalties, and travel tips.

How to set up an AR-15 for home defense. Barrel length, caliber choice, weapon light picks, optic selection, ammo recommendations, and storage solutions.

Free-float vs drop-in AR-15 handguards compared on accuracy, weight, heat management, installation, and cost. When each type makes sense for your build.

AR-15 twist rates from 1:7 to 1:9 compared. Which bullet weights each stabilizes, the most versatile option, and how to check your barrel’s twist rate.

Pistol, carbine, mid-length, and rifle gas systems compared with dwell time data, barrel length pairings, and troubleshooting for over-gassing and under-gassing.

What mil-spec actually means for AR-15 parts, when it matters for compatibility, and when aftermarket parts deliberately exceed military specifications.

Carbine, H, H2, H3 buffers explained with a complete weight chart, gas system pairing recommendations, and troubleshooting for short-stroking and over-gassing.

Every AR-15 barrel length from 10.3 to 20 inches compared with real velocity data, gas system pairings, and practical recommendations by use case.

Can you shoot 5.56 in a .223 chamber? The answer matters more than most people think. Here’s the complete breakdown of chamber pressure, dimensions, and safety.