Product Description The Wilson Combat TRLPGBM lo-profile gas block is a rugged, reliable solution for building or upgrading a rifle-length gas system while maintaining maximum clearance under popular free-float handguards. Precision bored to fit a .875" barrel journal, it is machined from durable 4140 chromoly steel and finished in corrosion-resistant black nitride for long service life. The block secures to the barrel with hardened set screws, and a gas tube roll pin is included to help complete your installation. Product Highlights Low-profile design fits under many free-float rail systems for clean AR-style builds. Precision-bored .875" barrel journal for a secure, consistent gas seal. 4140 chromoly steel construction for strength and heat resistance. Corrosion-resistant black nitride finish for durability in harsh conditions. Includes hardened set screws and gas tube roll pin for straightforward mounting. Specs Brand: Wilson Combat Model: Gas Block Series/Profile: Lo-Profile Firearm Type: Rifle (AR-style) Barrel Journal Diameter: 0.875 in Material: 4140 Chromoly Steel Finish: Black Nitride Attachment Method: Set-screw (hardened set screws provided) Includes: Gas tube roll pin Overall Length: 0.920 in Set Screw Spacing: 0.400 in UPC: 811826027887 Manufacturer Part Number: TRLPGBM 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.