Geissele Gas Block Pin Punch Set Black. 078" roll pin that secures the gas tube to the gas block on an AR-15/AR-10. Made from properly hardened and tempered 01 tool steel. Specifications for Geissele Gas Block Pin Punch Set: Manufacturer: Geissele Color: Black Fabric/Material: Steel Gun Model: AR-10 AR-15 Diameter: 0.078 in Country of Origin: USA Gun Type: Rifle Quantity: 1 Package Content: Geissele Gas Block Pin Punch Set The Geissele Gas Block Pin Punch Set 15-172 is a quality addition to the Geissele lineup. For more great deals on AR Gas Blocks by Geissele please browse our Geissele Gun Parts page. What firearm models does the manufacturer say Geissele Gas Block Pin Punch Set is compatible with? The manufacturer suggests that Geissele Gas Block Pin Punch Set is compatible with AR-15 AR-10Geissele 15-172: Gas Block Pin Punch Set Black