SIG should have covered their rear like G with a marketing label like, Gen. 1,2,3,4,5,6 etc., etc..
But then, I don't know of any manufacturer that hasn't had bug's with one thing or another, except H&K, but then, I'd have to look that one up.
Robin
No HK had some issues with the VP series, but it was due to them using the same recoil spring for both the VP9 and VP40 as a cost savings, they fixed that though