This 18" medium contour barrel is manufactured from 416R Stainless Steel and uses 3 land polygonal rifling with a 1 in 8" twist. Additional features include a mid-length gas port, M4 feed ramps and 5/8" x 24 threaded muzzle. With the 5/8" x 24 threading, this will allow you to use any .30cal muzzle brakes, flash hiders or suppressors. Included is a matched Type 1 bolt made from 9310AQ. Being Aircraft Quality 9310, it is free from any impurities, making it stronger than standard 9310 steel.
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