Best AR9 Lower: A Complete Review and Buyer’s GuideHunting, Rifle Review / By Tobias Contents hide 1 What is an AR9 Lower, and Why Do You Need it? 2 What to Look out for When Buying an AR9 Lower 2.1 Make 2.2 Stripped or Fully Assembled 2.3 Magazine Compatibility 3 Which is the Best AR9 Lower? Our Top Picks; 3.1 Best Stripped AR9 Lower 3.1.1 PSA PX-9 Forged Stripped Lower 3.1.1.1 Features of the PSA PX-9 Forged Stripped Lower 3.1.1.1.1 Durable Anodized Finish 3.1.1.1.2 Incredible Design 3.1.1.1.3 Comes with a Mag Catch and Ejector 3.1.1.2 Pros of the PSA PX-9 Forged Stripped Lower 3.1.1.3 Cons of the PSA PX-9 Forged Stripped Lower 3.2 Best Fully Assembled AR9 Lowers 3.2.1 PSA PX-9 GLOCK®-STYLE CLASSIC LOWER, Black – 5165449942 3.2.1.1 Features of the Glock Style Classic Lower 3.2.1.1.1 Durable Make 3.2.1.1.2 Recoil Reduction System 3.2.1.1.3 Lightweight Make 3.2.1.1.4 Crisp Trigger Pull 3.2.1.2 Pros of the Glock Style Classic Lower 3.2.1.3 Cons of the Glock Style Classic Lower 3.2.2 PSA PX-9 Forged Complete MOE Pistol Glock Style Lower– 5165449949 3.2.2.1 Features of the PSA PX-9 Forged Complete Glock -style MOE Pistol Lower 3.2.2.1.1 PSA Style Durable Make and Incredible Design 3.2.2.1.2 Magpul Grip 3.2.2.2 Pros of the PSA PX-9 Forged Complete Glock -style MOE Pistol Lower 3.2.2.3 Cons of the PSA PX-9 Forged Complete Glock -style MOE Pistol Lower 3.2.3 PSA PX-9 Forged Complete Glock -style MOE EPT Lower 3.2.3.1 Features of the PSA PX-9 Forged Complete Glock -style MOE EPT Lower 3.2.3.2 Pros of the PSA PX-9 Forged Complete Glock -style MOE EPT Lower 3.2.3.3 Cons of the PSA PX-9 Forged Complete Glock -style MOE EPT Lower 4 Building an AR9 4.1 What is the Legality around Building an AR9? 4.1.1 Regulations for Building an AR9 Pistol 4.1.2 Regulations for Building an AR9 Rifle 4.2 What Items Do You Need to Build an AR9? 5 Frequently Asked Questions (FAQs) 5.1 Is a stripped lower considered a firearm?