Tyrant CNC Sig Sauer P365 +3 Magazine Extension - Grey - Introducing the Tyrant CNC +3 Magazine Extension for the Sig Sauer P365 XMacro. Designed to boost your capacity by three rounds of 9mm, it brings your total to 20 (+1)-giving you added confidence when it counts. Precision CNC-machined from 6061 aerospace-grade aluminum, this extension features Tyrant CNC's innovative NoBak retention spring technology for reliable, long-lasting performance. Its streamlined design closely matches the P365 frame, helping reduce printing for a more discreet carry. Built for durability and flawless function, the NoBak system ensures dependable feeding without the need for a power spring-even if your magazine is dropped. Whether at the range or carrying for personal defense, this +3 extension is a performance-driven upgrade you can rely on. Made in the USA ; Adds 3 rounds capacity; CNC Machined from 6061 aluminum; Tool-less assembly/dissaembly "NoBak" Retention technology Why do they install so quickly? - They Use their proven "NoBak" retention plunger technology to allow the magazine extension to easily slide onto the bottom of your magazine! The entire install happens in 10 seconds or less and with no tools; Want to take it off? - Easy, just push the plunger down and slide the magazine base plate off! It takes no tools and is done easily; Fitment Notes Fits only P365 XMacro 17-round magazine; Works with most Magwells; Adds 3 rounds of capacity of 9mm; Comes with Power Spring; Does NOT fit other Sig P365 lower capacity magazines (flanges that fold in); Fits on California compliant versions; ***Depending on the magazine production date, your magazine may have a different spring due to a change in supplier for the OEM SIG P365 Magazines. This shorter spring may not have enough power to keep the slide locked back when the final round is discharged when using ours, or any other brands, magazine extension base pads.***