DoubleStar's AR-15 steel bolt is shot-peened for extra surface hardness, then batch magnetic particle inspected (MPI) for cracks and flaws to ensure reliability and long service life. Does NOT come with gas rings, extractor, and ejector installed.

Specifications and Features:
Caliber: 5.56 Nato, .223 Remington, .300 Blackout
Material: 158 Carpenter Steel
MPI Tested
HP Tested
Black Phosphate Coated
Made in the USA

This product is not returnable. Contact the manufacturer for warranty and assistance.