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Hi Shannon, This is a Gen 3 Non threaded barrel. SPECS- Specifications and Features: GLOCK 21SF Gen 3 Caliber: .45 ACP Capacity: 13 Round Magazine Frame: Polymer Barrel: 4.6" Length Rifling: 1:15.75", Right Hand Octagonal Twist Sights: Standard GLOCK Sights Length Between Sights: 6.77" Trigger: Striker Fired Length Of Pull: 0.49 in Trigger Pull Weight: 5.5 lbs Overall Length: 8.03" Height: 5.47" Width: 1.27" Weight: 26.28 oz Finish: Black Please click the green box stating it as the best answer. We are rated on our answers and are just volunteers, not Buds employees. You can choose more then one Thank you!

This model is the Gen 4 threaded barrel-- https://www.budsgunshop.com/catalog/product_info.php/products_id/93192/Glock+G21SF+13%2B1+45ACP+4.91+Threaded+Barrel Gen 3 threaded barrel--- https://www.budsgunshop.com/catalog/product_info.php/products_id/93191/Glock+G21SF+10%2B1+45ACP+4.91+Threaded+Barrel

Please click the green box stating it as the best answer. We are rated on our answers and are just volunteers, not Buds employees. You can choose more then one Thank you!

no this one is not the threaded barrel specsUPC: 764503072031 Description: GLK 21SF 45AP 13R FS SMR GLKRL Brand: Glock Model: Gen 3 21SF (Short Frame) Type: Pistol: Semi-Auto Caliber: 45AP Finish: Black Matte Action: Safe Action Stock: Black Polymer Sight: FT: White Dot RR: White Outline Barrel Length: 4.60 Overall Length: 7.59 Weight: 26.28 oz Capacity: 13+1 # of Mags: 2 Safety: Safe Action-3 Separate Automatic Safeties Receiver: Polymer with Finger Grooves Packaging: Plastic Case Features: Magazine Loader, Cleaning Rod and Brush; Standard Magazine Release, Glock Rail Here is the one Buds has in stock with threaded barrel https://www.budsgunshop.com/catalog/product_info.php/products_id/93192/Glock+G21SF+13%2B1+45ACP+4.91+Threaded+Barrel