Some comments in the LAPD bans them thread got me thinking about this. I would not trust my Taylor Freelance or other +5 or +6 magazine extensions for raceguns as "street worthy" or something I would put in a defensive firearm, home or even the reload for a concealed gun. But on the other hand, there are some factory or aftermarket extended magazines I do trust in a defensive firearm.
Curious as to what others here think belongs (or not) on that list of factory extended mags that are satisfactory for duty or self defense use.
Based on my personal range experiences with them, lack of any malfunctions, I WOULD TRUST
Mec-gar +2 factory extended mags for P226, P229
Sig factory 21 round mags for the P320/250 9mm platforms
Beretta PX4 20 round 9mm magazines
Glock +2 extensions for their 9mm magazines (unless they were frequently getting dumped on the concrete in that use case)
HK full metal lined versions of the Jet Funnel mags for the USP 9mm
HK factory 20 round 9mm mags for the P30 (also fit the P2000, VP9, USP/c)