Looking for some clarification. I'm interested in the M&P9 Pro, NiB slide, 5" barrel. Mod#151151 has the NiB slide but it's only the 4.25" barrel and it's not Pro. I've been to S&W's website but don't see a model number for this configuration. Does anyone know if it's possible to get this configuration? Any help for this newbie would be appreciated. Thanks.