The AR-15 in 5.56
Stoner’s rifle and the service lineage behind it, then the parts that matter: what mil-spec actually guarantees on a lower, how barrel length trades against gas length and dwell, why twist is set by bullet length rather than weight, and the 5.56-versus-.223 question answered from the chamber prints instead of the folklore.
The AR-15 in 5.56 · Deep Dive
The pressure figures everyone compares are not measurements of the same thing — SAAMI reads half an inch behind the case mouth, NATO reads at it.
Stoner’s rifle and the service lineage behind it, then the parts that matter: what mil-spec actually guarantees on a lower, how barrel length trades against gas length and dwell, why twist is set by bullet length rather than weight, and the 5.56-versus-.223 question answered from the chamber prints instead of the folklore.
Photo: Edgar's first AR-15 by Mitch Barrie · CC BY-SA 2.0
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