Alpha Shooting Sports ALPHA G17 9MM Match Grade Barrel 4.5in Gold. CNC Machined on state of the art equipment. Tighter barrel lock up. Manufactured from premium 416R stainless steel bar-stock. Gas vacuum heat-treated and double-tempered to mitigate stress. Broach cut rifled in 1:16LH twist for improved accuracy and the ability to shoot lead (non-jacketed) projectiles. CNC diamond honed bore for improved accuracy and concentricity. Fully supported and polished chamber and feed ramp. Specifications for Alpha Shooting Sports ALPHA G17 9MM Match Grade Barrel: Manufacturer: Alpha Shooting Sports Caliber: 9mm Luger Gun Make: Glock Gun Model: Glock 17 Gen 4 Glock 17 Gen 3 Model Generation: 4 3 Additional Features: 4.5in Length Condition: New Features of Alpha Shooting Sports ALPHA G17 9MM Match Grade Barrel CNC Machined on state of the art equipment. Compatible with 3rd & 4th Gen G17's. 4.5" barrel. Tighter barrel lock up. Manufactured from premium made in specialized factories 416R stainless steel bar-stock. Gas vacuum heat-treated and double-tempered to mitigate stress. Broach cut rifled in 1:16LH twist for improved accuracy and the ability to shoot lead (non-jacketed) projectiles. CNC diamond honed bore for improved accuracy and concentricity. Fully supported and polished chamber and feed ramp. G17 Pistol not included. Package Contents: Alpha Shooting Sports ALPHA G17 9MM Match Grade Barrel What firearm models does the manufacturer say Alpha Shooting Sports ALPHA G17 9MM Match Grade Barrel is compatible with? The manufacturer says that Alpha Shooting Sports ALPHA G17 9MM Match Grade Barrel is compatible with Glock 17 Gen 3 Glock 17 Gen 4Alpha Shooting Sports ALPG179MMTIN: ALPHA G17 9MM Match Grade Barrel Gold 4.5in