Line45 Explains Why the SIG P365 Still Leads Carry Gun Sales

In a video from Line45, the channel breaks down why SIG's P365 is still dominating the carry gun market eight years after launch, and why the usual pattern of a hot pistol fading as competitors catch up never happened here.

Snapshot

Line45 traces the P365 from its original pairing of micro-compact size with high capacity through its many spinoff models, the swappable serialized fire control unit and a deep pool of holsters, magazines and optics. The channel concludes that the pistol stayed on top of sales charts because SIG kept refining and expanding it rather than letting it stand still.

Key points

• Sales numbers back it up: Line45 cites GunBroker data showing the P365 was the top-selling new firearm overall in 2025, outselling both the Glock 19 and the Glock 43X, and it held the number two spot among used semi-autos in May and June 2026.
• The original idea was the breakthrough: Line45 explains that in 2018 SIG fit 10-plus-one rounds of 9mm into a true micro-compact, so buyers no longer had to choose between small size and high capacity.
• SIG kept expanding the lineup: according to the video, the platform grew into the XL, the 17-round X-MACRO (with optional 21-round magazines), a .380 version, the metal AXG Legion, and compensated, optics-ready configurations.
• The FCU is the real "gun": Line45 points out that the serialized fire control unit lets owners swap grip modules, slides, and barrels, so the pistol can change fit without the owner abandoning it for something else.
• Ecosystem matters as much as hardware: the video argues mature holster, magazine, and optic support makes switching to a competitor harder, since buyers would be leaving a whole support network behind.

Quick take

Line45's argument boils down to this: the P365 survived not by staying the same, but by SIG refusing to leave it alone.

Watch the full video: Line45