Tyrant P365 X-Macro Mag Ext +3 Blk

The Tyrant CNC P365 X-Macro magazine extension adds 3 rounds of 9mm capacity to your Sig Sauer P365 X Macro, bringing the 17-round magazine up to 20 rounds total—a meaningful boost for shooters who want more ammo on tap without switching to a full-size pistol. Built from 6061 aerospace-grade aluminum and machined to tight tolerances, this extension is engineered to minimize printing and maintain the P365's compact, carry-friendly profile. If you run your P365 X Macro for personal defense, competition, or range sessions, this is a straightforward way to increase your round count.

What sets the Tyrant extension apart is the NoBak retention spring technology. Unlike some extensions that require additional power springs or complex installation, this one uses Tyrant's proven retention plunger design—no tools, no fuss. Slide it onto the magazine base pad, and you're done in seconds. That same tool-free approach applies to removal; just press the plunger and slide it off. No gunsmithing required, and it functions reliably without needing an aftermarket power spring. The design also plays well with most magwells and works on California-compliant versions of the P365 X Macro magazine.

One important note: the extension is engineered specifically for the P365 X Macro's 17-round magazine and will not fit other lower-capacity P365 magazines with folding flanges. Also, depending on when your OEM Sig magazine was manufactured, it may have a different spring than older versions; if that newer, shorter spring is in your mag, it may not lock the slide back on the final round when the extension is installed. This is worth testing at the range before relying on it for carry. Weighing just a third of an ounce and measuring 1.55 inches long, the extension adds minimal bulk while giving you measurable capacity when it counts.

Key Features

• Adds 3 rounds of 9mm capacity to P365 X Macro magazines (17 to 20 rounds total)
• CNC machined from 6061 aerospace-grade aluminum for durability and precision
• NoBak retention technology allows tool-free installation and removal in seconds
• Does not require an additional power spring to function
• Minimal profile designed to reduce printing during concealed carry
• Compatible with most magwells and California-compliant magazines

Specifications

Caliber	9mm
Capacity Increase	+3 rounds
Total Capacity with Extension	20 rounds (+1 in chamber)
Material	6061 aluminum
Length	1.55 inches (40mm)
Width	1.09 inches (30.5mm)
Height (Extension Only)	0.9 inches (28mm)
Weight (Extension Only)	0.3 oz (32 grams)
Assembled Magazine Height	133.35mm
Assembled Magazine Weight	104 grams
Installation	Tool-free

Frequently Asked Questions

Will this fit my Sig P365 X Macro magazine?

Yes—this extension is designed specifically for the P365 X Macro's 17-round magazine. It will not fit other lower-capacity P365 magazines with folding flanges.

Does it require a power spring or any gunsmithing to install?

No. The NoBak retention spring technology allows the extension to function without an additional power spring. Installation is completely tool-free and takes about 10 seconds—just slide it onto the magazine base pad.

What should I know about slide lock on the last round?

Depending on your magazine's production date, it may have a newer, shorter OEM spring. This spring may not have enough power to lock the slide back when the final round is fired with the extension installed. We recommend testing this at the range before relying on the extended magazine for carry.

How much does this add to the size and weight of my magazine?

The extension adds 0.3 oz and is 1.55 inches long, designed to minimize printing during concealed carry. The assembled magazine height is 133.35mm and weighs 104 grams total.