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AICS mag extension

I use the Seekins ones, but I don't think they are produced anymore. Altus Shooting Solutions has a base plate/mag extender that seems to be a close copy of the Seekins (may even be made by them?). That's the route I would probably go.

People also seem to like the MPA and Area 419 ones. I just think the A419 ones look a bit goofy.
 
I run the Area 419 mag extensions. They are great and fit and finish is excellent.
When you first install them, you need to stretch the mag spring out to make up for the new depth. Do it in small increments, until you find the correct spring tension. I found that too much spring tension is just as bad a not enough.
 
No experience with them but MK Machining is also making some. I'm not sure how the 3-D printed polymers hold up for mag extensions but some of those nylons that are used can be pretty tough. I think the owner posts on here.