This is a factory SIG P365XL 10-round magazine, chambered in 9mm.

This Sig P365XL magazine will fit flush with the mag-well, and it holds up to 10 rounds of 9mm ammunition in its solid steel construction.

This P365XL magazine offers a strengthened steel frame which can endure even the most extreme conditions. Together with the anti-tilt polymer follower and stainless steel internals, this magazine will feed consistently into your Sig Sauer P365XL pistol.

This magazine’s advanced polymer baseplate can withstand high drops, even fully loader. Also, it has side witness holes located 5 rounds and 10 rounds.

More Info about the Sig Sauer P365XL Pistol
The perfect balance of micro-compact concealability with full-size shootability the P365 XL packs 12 + 1 or available 15 + 1 capacity in a micro-compact, highly concealable size yet maintains the comfort and shootability of a full-size pistol. The first P365 offered in the XSeries family, the XL comes standard with an extended slide, 3.7” barrel, and the brand new 365 XSeries grip module with extended beavertail and integrated magwell.  The new slide and grip module only add about 1/2″ to the overall length and height of the micro-compact P365, while increasing the capacity to 12+1 rounds of 9mm.  It still maintains the crisp, clean P365 trigger pull, but with the “X” signature flat profile trigger that breaks at 90 degrees.  Also standard are the signature XRay3 Day/Night sights with a rear sight plate assembly that allows direct mounting of the new SIG SAUER RomeoZero or the RMSc reflex optics.  Never has so much versatility and capability been squeezed into such a perfectly concealable size.