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A short, practical AR-15 accessories list: what to buy first, what can wait, and picks with today's best price.

How red dots, low-power variable optics and prism scopes differ, who each one suits, and what mount each needs on an AR-15.

The AR-15 and the M4 look almost the same. Here's what actually differs, what civilians can buy, and how to build an M4-style rifle …

What each AR-15 barrel profile is good for, and which twist rate stabilizes which bullet weight, with charts for 5.56, 300 Blackout, .308 and …

Ambidextrous, extended-latch, suppressor-friendly and budget charging handles, with what to look for and today's best price for each pick.

Tools, the eight steps to swap a standard AR-15 trigger, how drop-in triggers differ, the function check you must do afterwards, and the mistakes …

Torque values for the barrel nut, castle nut, muzzle device, gas key and the small screws, with the units that trip people up and …

The muzzle thread for every common AR-15 and AR-10 caliber, what the numbers mean, and how to check your barrel before you buy a …