The Glock 20 Gen 5 Delivers Formidable Force Downrange With High Accuracy Over Long Distance. The Use Of Glock Hi-Tech Polymer Considerably Reduces Felt Recoil Even In This Heavy Caliber. With The G20 Gen5 MOS Glock Enhances The Desirability Of The Already Near-Perfect Gen5 Model With The Addition Of The Modular Optic System (MOS). The Slide Is Precision Machined To Provide A Mounting System For Popular Optic Sights. With Multiple Adapter Plates, You Can Quickly And Easily Mount Miniature Electronic Sights To The Rear Of The Gen5 Glock Slide, Which Has Front Serrations For Easier And Quicker