"We have upwards of 30 variations." [Unger] said. "At the lowest price-point we have the Airweights with aluminum frames, the 642 and so forth. Next up in price are the all-steel models, such as the 60 and 649. The next notch up in pricing is the M&P series, such as the popular Model 340 M&P, with Scandium alloy frames and stainless steel cylinders."