FN Five-Seven Factory 10 Round Magazine. FN 509 9MM 24-Round Magazine. (function () { Title. But this gun is clearly built for concealment. The FN 503, inspired by FN’s legendary heritage, is the company’s first entry into the slim 9mm pistol market. The CMMG Five-Seven +10 round Mag Extension kit. Bids. Get SPECIAL OFFER and cheap Price for Bolt Lift Sv And Fn 57 Extended Clip. Get SPECIAL OFFER and cheap Price for Bolt Lift Sv And Fn 57 Extended Clip. FN made big news Tuesday, announcing the release of its newest pistol, the 503. Bids. ... FN 1 NEW 30rd extended magazine for the 5.7 pistol BuyItNow! ProMag RUG16 7 Rd 9mm Blue Steel Clip Magazine mag for Ruger LC9 LC9S EC9 EC9S. I will call in short name as Price Fn 5 7 And Taurus Tcp 380 Extended Clip For folks who Using the design, performance and reliability standards of the FN 509® family as inspiration, the FN 503 has been purpose-built to conceal quickly and discreetly without compromising on the features and performance FN customers require – like it’s 3.1-inch barrel with recessed target crown to ensure dependable accuracy; enlarged controls and soft recoil that make this gun comfortable and controllable to shoot; and, FN 509-style low-profile iron sights. FN 503 9mm 8 Round Magazine. The FN 503, inspired by FN’s legendary heritage, is the company’s first entry into the slim 9mm pistol market. $17.21. $49.00 $43.95. The new pistol ships with one 6-round magazine with pinky extender and one 8-round magazine with grip sleeve in FN’s standard soft-sided zippered case. Based on its 509 series, the 503 comes in remarkably compact and slim, purpose built for the concealed carry market. }; //