Sig Sauer P226 MK25 Threaded Barrel 9mm — Full-Size DA/SA, Nitron Slide, Hard-Anodized Alloy Frame, Navy Anchor, 3x 15-Round Mags
This Sig Sauer P226 MK25 Threaded Barrel stands out as the commercial counterpart to the U.S. Navy P226 variant. It features a factory 4.9 inch chrome-lined threaded barrel with M13.5x1 LH threads and a thread protector, a stainless slide with Nitron finish, and a hard-anodized aluminum-alloy frame. The frame carries the factory UID/data plate and the slide bears the Navy anchor emblem, with phosphate-coated internal steel parts for added corrosion resistance. It includes three 15-round magazines, two IWB Kydex holsters, the factory case, and both G10 grips (installed) and factory P226 grip panels.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This firearm presents cleanly with only minor, superficial scratches and blemishes from light handling. The bore is bright and shiny.
What’s Included
- 3x 15-round P226 9mm steel magazines (marked "Made in USA")
- SIG Sauer factory hard case
- SIG Sauer P226 owner's manual
- Galco IWB Kydex holster
- IWB Kydex holster
- G10 textured grip panels (installed)
- Factory P226 grip panels (pair, not installed)
The MK25 designation identifies this pistol as the commercial version of the Navy P226, complete with the Navy anchor on the slide and a factory UID/data plate on the frame marked with the MFR code and MK-25-TB designation. The true MIL-STD-1913 Picatinny rail on the dustcover supports duty-style mounting options.
The 4.9 inch factory threaded, chrome-lined barrel uses an M13.5x1 left-hand thread and ships with a thread protector. The barrel, combined with the factory sights and full-size format, supports confident control and clear sight alignment.
Construction details include a stainless steel slide with a Nitron black finish over a hard-anodized aluminum-alloy frame. Internal steel parts are phosphate-coated, emphasizing corrosion resistance in line with the model's service-inspired pedigree. The frame finish and slide treatment are designed for durability.
Operation is DA/SA with a spurred hammer and a decocking lever. Capacity is 15+1 in 9mm Luger. This example is mated with textured G10 grip panels (with the factory panels included) and was made in the USA under part number MK-25-TB.

