PEORIA, Ariz. – Apex Tactical Specialties, the leading manufacturer of aftermarket drop-in firearm parts, announces available Apex upgrades for the new FN 509 Midsize MRD. The following is a list of currently available Apex upgrades compatible with the new FN 509 Midsize MRD: – Action Enhancement Kit (part# 119-125) – Apex 9mm Threaded Barrel - 4.00" (part# 105-072) – Apex Heavy Duty Striker (part# 119-185) – Apex Failure Resistant Extractor (part# 119-168) – Apex Optic Mount for the Aimpoint® Acro P-1 optic (part# 119-109) Retailers and wholesale distributors that are interested in stocking Apex upgrades for the FN 509 Midsize MRD, and other FN 509 models, can contact Apex at [email protected] or (623) 322-0200 for pricing and quantity availability. For more information on parts from Apex Tactical Specialties, visit, like Apex Tactical on Facebook or follow @ApexTactical on Instagram or Twitter. Instructional videos on the installation of Apex parts are available on Apex's YouTube, Full30 and GunStreamer channels.