I once owned a Glock 17 which I purchased brand new from a dealer with a mismatch slide and barrel number. It was off by one digit.
Does this matter? Isn't the frame the tracked part?
For example, you can buy Sig slides/barrels in different calibers that fit the same frame.
I just checked my 226 Mke 25 I bought new. The number on the inside of the slide is different than the serial number of the gun. I am quite certain it is not nor was ever meant to relate to the serial number of the gun. The sequence of numbers is not the same either. I am quite sure you can sleep easy. My Sig was made in the US and the US does not require the serial number to be engraved on the barrel, slid and frame like some European countries do eg. Czech Republic
Take Care
Bob
Call Sig. They are very helpful. I had a mk25 and had only received 2 mags from the retailer. I called Sig, told them the serial number and they confirmed that my mk25 was shipped with 2 and a coupon for a free third mag (there was a temporary mag shortage). Somewhere down the pipe, that coupon was removed. Sig offered to ship me the third mag.
I have also heard of some "irregularities" involving frames not matching slides. There have been accusations that the frames were swapped by some unscrupulous retailers put normal 226 frames (without the phosphate internals) with the mk25 slides (with anchor). These retailers were then thought to sell the frames at a premium. This was mostly conjecture. My mk25 matched. Call Sig and ease your mind.



























