Product Description The Aero Precision Adjustable Low Profile Gas Block gives AR-15 shooters precise, hands-on control over their rifle&';s gas system. Engineered for barrels featuring a .875 gas block journal, this gas block is the ideal upgrade for suppressed firearms where managing excess gas is essential, as well as competition builds focused on reducing felt recoil. Machined from tough 4140 steel and finished with a durable nitride coating for lasting corrosion resistance, the low-profile form factor slides cleanly under slim free-float handguards, including the Aero Precision ATLAS series. A custom stainless-steel adjustment screw delivers 15 distinct gas settings, secured by a spring-and-detent system that produces audible clicks with every adjustment for repeatable, reliable tuning. A built-in sacrificial chamber channels carbon fouling away from critical components, simplifying maintenance and allowing easy solvent access. The user-serviceable design makes field cleaning and upkeep straightforward. Product Highlights Low-profile design fits seamlessly under slim free-float handguards, including the Aero Precision ATLAS series handguard lineup Custom machined stainless-steel adjustment screw provides 15 precise gas settings with audible spring-and-detent clicks for repeatable, no-slip adjustments Carbon fouling channeled to a dedicated sacrificial chamber prevents carbon locking and provides easy solvent access for thorough cleaning Machined from 4140 steel with a nitride finish for exceptional durability, hardness, and corrosion resistance in demanding conditions User-serviceable design includes the assembled adjustable gas block, a 6" 3/32 adjustment wrench, and a replacement spring and detent Specs Brand: Aero Precision MPN: APRH101615C UPC: 815421028225 Material: 4140 Steel Finish: Nitride Color: Black Type: Adjustable Low Profile Gas Block Compatible Barrel Journal: .875" Compatible Firearm: AR-15 Attachment Method: 10-32 x 3/16 Knurled Set Screws Gas Adjustment Settings: 15 Includes: Assembled Adjustable Gas Block, 6" 3/32 Adjustment Wrench, Replacement Spring and Detent Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.