OA Defense OA-2311-FPRO-ELT-HDB-PRT-21: The OA 2311 Pro is the full-size ported powerhouse of the OA Defense line-up. Designed and optimized for duty use and high round count range days, the OA 2311 Pro delivers maximum performance, accuracy and reliability even under the harshest conditions. Featuring a cut & contoured slide, ported 5\" barrel, enhanced trigger, extended mag release paddle and five mags. Fully ambidextrous controls, optic-ready slide, lightning fast cycle time and a modular grip & magwell make make you prepared for all conditions. Includes four side plates, three optic mounts (RMR, DPP and RMSc footprints) and iron sights, two 17rd and three 21rd magazine, range bag and safety lock.