A few years ago I picked up a Lonewold 9mm conversion barrel for my G35. Cheap old WWB functioned just fine and light reloads as well. If you look at Glocks 9mm and comparable .40 model ie 17/22, 19/23, and 26/27. The recoil spring thats in the 9mm is the same lb. rating in the comparable sized .40. Also the slides are the same size and weight as well.
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