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things like the barrel(length), handguard its just better quality parts : 810038641669 lower priced specs TROY A3 Pistol (Black) Specifications and Features TROY Industries Item Number: SPST-CA3-10BT-B1 Semi-Automatic AR15 Pistol 5.56x45 NATO (accepts .223 Remington) 30 Rounds 10" Barrel Billet Receiver (no forward assist) 9" M-LOK Handguard A2 Pistol Grip Pistol Buffer Tube A2 Flash Hider Black Anodized Finish 812441028112 higher priced specsTroy Defense A3 Pistol (Matte Black) Specifications and Features: Troy SPST-CA3-10BT-19 Direct Gas Impingement System AR-15 Semi Automatic Pistol 5.56 NATO (accepts .223 Remington and 5.56 NATO) 10.5" Barrel 1:7" Right Hand Twist Rate Forged Aluminum Upper/Lower Receiver Flat Top Upper Troy M-LOK BattleRail Free Float (9.25" Length) Troy Standard Safety Selector Troy Standard Trigger Troy Flat Trigger Guard Troy A2 Control Grip Pistol Grip) 30 Rounds Troy 30 Round BattleMag (Standard pattern AR-15 Magazine) A2 Flash Hider Pistol Buffer Tube/Recei

Hi, the more expensive one has Forged Aluminum Upper & Lower Receivers, a Troy M-LOK BattleRail Free Float handguard, and a Troy Flat Trigger Guard. The other one has a billet receiver, a lesser grade handguard, and a rounded trigger guard. Basically, the more expensive one has better parts. Stay safe & have a great day!