I'm partial to the SV magwell but they're pricey. The DP works equally as well.
On non competition guns the EB or S&A work well

 

I'm partial to techwells. There are 4 different magwells to select from based on the guns usage. I run a XP on my trojan 40 for Singlestack.

 

^This. But you need their grips or mod your own to work with them.


http://techwearusa.com/techwell/

 

Ed Brown maxi-well fan here.

 

Dawson Precision on my Trojan and love it! I got the no gap and purchased different base pads for the mags, really like it. There is a no gap option to fit any mag....

I would recommended them to anyone!

 

Ed Brown.

 

Ed brown

 

I have the Dawson standard ICE magwell on my Trojan and like it alot.

 

I bought an Ed Brown snakeskin magwell for my Trojan to match the frontstrap, and there is a definite gap between the frame and magwell. It is a nice part, but I am going to have to send it to a gunsmith to get rid of the gap unless I can figure something else out. The takeoff magwell from my TRP fits perfectly.

 

I've got a slight gap between the frame of my Trojan and an S&A magwell. Done everything I can think of to get rid of the gap, to no avail.

 

Techwell XT IPSC model on a STI 1911.