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Gen M2 MOE or Gen M3? 20, 30 or 40 rounds? How Magpul PMAGs differ, which rifles each fits, and today's prices.

M-LOK, KeyMod or Picatinny? How each rail system works, what the Navy's 2017 Crane test found, and which handguard and covers to buy.

Chrome-lined, QPQ nitride or stainless: what each AR-15 barrel treatment is, what makers claim, and live prices.

Carbine, rifle, A5 or pistol buffer tube? What each type is, which stock and buffer go with it, and why you cannot mix them.

The lightest AR-15 stocks by maker weight, from the 5.8 oz Battlelink Minimalist to skeleton fixed stocks, with live prices.

Fixed or collapsible AR-15 stock? What a fixed A2 or carbine stock gives up, the buffer tube each needs, and live prices.

Our picks for the best AR-15 pistol grips, from the Magpul MOE and MIAD to Hogue OverMolded, with maker angles, weights and live prices.

Which AR-15 controls can be ambidextrous, which ambi safety selector to buy, and when a fully ambidextrous lower is worth it, with maker specs …