Curved Sig Rail vs. Flat 1913 Picatinny Rail

Confirmed: Blackhawk SERPA CQC holster will NOT fit a Sig Sauer P226 MK25 26

Sig Sauer P226 MK 25When I bought my Sig Sauer P226 MK25 9mm pistol (commonly referred to as the “Navy Seal” gun), I had no idea that finding a concealed holster to fit would be so difficult. I really like the Blackhawk SERPA CQC holster, but web searches could never definitively tell me if it would fit. So, after purchasing the SERPA holster for the P220/P226 (part number 410006BK-R), I can now confirm that the P226 MK25 will not fit this holster — even with the retention screw completely loosened.

The problem is that the accessory rail on the MK25 is a true (i.e. flat) M1913 Picatinny rail, as compared to the curved Sig Rail on most other P226 models. Here’s a side-by-side comparison on a Sig P250:

Curved Sig Rail vs. Flat 1913 Picatinny Rail

Curved Sig Rail vs. Flat 1913 Picatinny Rail

Because the tolerances on the SERPA CQC holsters are so precise (which is understandable for a retention holster that is custom fit to a specific model), the slight difference in rail geometry is enough to make the fit of the P226 MK25 not fit.

I’ll probably end up finding someone who can make a custom holster in Kydex for me. I recently picked up a Streamlight TLR-2s light for this pistol (review coming soon), and while I’m told that Safariland makes a 6280 holster for the P226R (Sig railed version) with a TLR-1 attached, I’m certain that the extra bulk from the laser assembly on the TLR-2 won’t fit in the Safariland either.

Hopefully, this short post will help others who are wondering if a Sig Sauer P226 MK25 will fit a Blackhawk SERPA holster. I love the gun, and I love the SERPA holster, but they just don’t work together.

If you’ve got a MK25 and can personally confirm a commercial holster that will fit properly, please feel free to leave it in the comments.

UPDATE: I bought the IMI Defense Holster for it that supports the Streamlight I have attached to the rail. It’s a big OWB holster, but it fits perfectly. I’ve also been able to confirm that Comp-Tac makes a shell for the MK 25, which will work with any of their holsters.