I still have 2 Fox .40's that have always run strong since new, one dates back to the 80's. Both are still in use today, one in a Telemaster .40 and the other in a Sig Kougar. They are powerful and light and I love them. Both have the 2 needle carb.

P.S. I have also run and own O.S. and Supertigre with great results, too.