Can the mag catch be replaced with an older style?
What is the QC status of current production P226s?
Yes, the two style mag catches are interchangeable on the 226.
On the QC question, not sure large scale wise. The 50 226 Legions we got did have the issue with the mecgar mags. A couple of guys also complained that the sights were wildly off. Quick confirmation zero by the range staff, and a reminder that Sig generally regulates their sights for a 6 o'clock hold at 25 yards "cured" that complaint by a couple members of the SWAT team. *sigh*
The 226 is by far and away my favorite DA/SA. Still kick my self for owning and selling 2 of them. The first was German built & Exeter assembled, the second was a railed version I let go about a decade ago. Wouldn't want to edc either one, but I feel stoopid for not still having at least one of those gems in my safe.
Generally speaking, I am a fan of the Sig P series guns, although i prefer the older versions with short extractors. Your mag experience and the Sig response are disturbing, especially since MecGar is the OEM mag on those guns. Were these the (more or less) flush fit 18 round mags or the ones with the long basepads? If the latter, I wonder if it is the longer length of the mags and resulting extra force when seating them that caused the issue?
I carry the mecgar 15 round flush fit mags in a P229 and have had no problems (yet). I have some 18 round mags for training and now wonder if I should just change the baseplates and make them 15s..... (I don't really care much about the extra few rounds)
The magazines were the 'flush fit' 18 round Mecgars. I believe the problem only exists with the new style magazine catch. There's apparently just enough difference in the geometry of the part that not all of th work reliably in all of the guns. Some just would drop out mid shot string.
The design follows the 320 mag catch design (easier and cheaper to produce) and for what it's worth, they work flawlessly with factory mags. Even 15 round Mecgars. It isn't the same part as the 320 one though. The 320 button/catch are triangular, and the 226 one is the classic oval. I believe it's also the same one used in the 320 AXG frame by the way. Likely easier to machine the frame with an oval.....I guess. I have a 320 AXG Pro LE, and I haven't encountered any issues with the factory mags.