Brownells Brownells Brownells 75th Anniversary - A Shooting Heritage

Self-Lubricating Surface Treatment Provides Smooth, Reliable Function

Drop-in bolt has a self-lubricating surface that eliminates the need to apply oil or grease that can attract dirt, dust, unburned powder, and carbon and lead to cycling failures. Proprietary EXO treatment produces an exceptionally hard surface that’s 40% more wear resistant than chrome plating, with an ultra-low friction coefficient. Surface is actually harder than the substrate underneath and will not peel, flake, gall, or rub off. EXO-Treated Nickel Boron finish bolt/carrier groups have been tested to function reliably without additional lubrication up to 50,000 rounds. Reduced friction also means less heat generated by metal-on-metal contact, so the gun runs cooler and parts last longer. Easy to clean, too—fouling brushes right off. Before treatment, parts are shot peened for surface uniformity and magnetic particle inspected to make sure there are no hidden flaws. Bolt includes extractor, ejector, and gas rings installed. Add the firing pin of your choice.


AR-15, Issue:09, Page:009
Big Book Catalog, Issue:66, Page:009
Law Enforcement / Police Store, Issue:09, Page:054
New Product Supplement, Issue:621, Page:001

SPECS: Heat-hardened carbon steel, EXO-treated Nickel Boron finish. Fits mil-spec AR-15 upper receiver.

FAIL ZERO COMPLETE AR15 BOLT
100-004-475WB
AR-15 Bolt

Mfr Part: EXOBOLTASS01

$84.99

In Stock

Caliber: 22 Caliber (.223-.224)

Finish: Silver

Hand: Right