The M118 LR Chamber: The .223 Wylde of the .308 AR World

Sierra Bullets

Guest blog from our friends at Criterion Barrels, Inc.

A typical AR-10 or other .308 AR pattern rifle will normally come standard with a SAAMI specified .308 Win chamber. While this configuration is designed to accommodate a wide range of different ammunition options effectively, it is less than ideal for a precision .308 AR rifle build. A wider throat diameter (.310) and shorter freebore length (.090) will allow the rifle to accommodate chamber pressures typically found with factory loads, but the wider inside diameter of the throat can cause complications with bullet and bore alignment during feeding, limiting accuracy potential with high performance ammunition.

Criterion Barrels Inc. typically utilizes a .223 Wylde design on their AR-15 barrel models. The benefit to this design involves a slightly tighter throat angle than its 5.56 NATO counterpart, with a longer freebore (when compared to the .223 Remington) to counteract the additional chamber pressure…

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