DEMO Wilson Combat Barrel Match Grade AR-9 SBR 9mm 11.3in Round 5/8x24 TPI 1-10 Twist Stainless Steel TR-9MMCABB11RT10. All Wilson Combat Match Grade AR-15/10/9 barrels are precisely crafted of the finest made in specialized factories 416R rifle rated steel on computer controlled equipment to our exacting list of technical specifications. These proven barrels feature a hand-polished bore and feedramps and then complete a rigorous final inspection process that ensures your new barrel will meet your most demanding expectations. All barrels feature crisp CNC markings precision muzzle crown and a chamber and gas port optimized for reliability. Because of the nature of the AR parts business and varying pressures of commerically avaiable ammunition Wilson Combat cannot guarantee function in customer built AR rifles. We recommend all components be installed by a competent rifle-smith. If you assemble a firearm with Wilson Combat components and it fails to function you first need to check the fit of the barrel to the gas block and the overall condition of your rifle's gas system/bolt carrier group to ensure your system isn't leaking gas. As buffers and springs play a role in overall reliability the use of an aftermarket style buffer system is not recommended. When using an adjustable gas block reliability is best achieved at the fully open setting without any gas port restriction. Wilson Combat will not troubleshoot customer built firearms/uppers. Specifications for Wilson Combat AR9 Match Grade Barrel: Manufacturer: Wilson Combat Color: Stainless Fabric/Material: Stainless Steel Barrel Length: 11.3 in Barrel Profile: Recon Barrel Twist Rate: 1-10 Gun Make: AR Platform Gun Model: AR-9 Weight: 1.313 lb Firearms Threads Per Inch: 5/8x24 Projectile Caliber: .355 Caliber Features of Wilson Combat AR9 Match Grade Barrel All barrels feature crisp CNC markings Precision muzzle crown and a chamber and gas port optimized for reliability Package Contents: Wilson Combat AR9 Match Grade Barrel What firearm models does the manufacturer say Wilson Combat AR9 Match Grade Barrel is compatible with? The manufacturer suggests that Wilson Combat AR9 Match Grade Barrel is compatible with AR-9Wilson Combat TR-9MMCABB11RT10: Barrel Match Grade AR-9 SBR 9mm 11.3in Round 5/8x24 TPI 1-10 Twist Stainless Steel