Not a drop in after all - Faxon Firearms Flame Fluted Smith & Wesson M&P 2.0 Compact 9mm Pistol Barrel

Did not function as a drop in. Chamber was too long. This would have required gunsmith work to make barrel fit in my 2.0. Returned. Optics Planet handled their end perfectly-delivered quicker than I expected. However, Faxon's claim that this is drop in was not correct.