I have run them in .40 on P2000 and P30 magazines as reloads for my P2000SK - I did no modifications at all and am getting extra four rounds without issues loading or feeding.
For grins was even able to mate them to an SK magazine and use the P2000 spring to getting a working 13 rd frankenmag. It looked "cool", but I did not like the transition from grip to the extension and moved them back to P30's again.