What are you running and how's it shoot? Any issues?
Glock 20 for me. All you need is an aftermarket conversion barrel (about $100.00) to shoot .40 S&W through it, which adds some inexpensive versatility to it. I bought the Lone Wolf conversion barrel for mine. Works perfectly. You use the standard 10mm mags with the .40 S&W conversion barrel. No switching out of extractor, or any part other than the barrel.