Fits newer P229 and P229 E2 pistols with wider tapered P229-1 magazine; Will not fit in older P229 pistols with narrow flat-sided magazine; Increased capacity to 17-rounds with "Plus-2" Adapter; Only 5/8" longer than flush-fit magazines; Redesigned tube to improve functionality, heat-treated for strength; Anti-Friction Coating allows for easy loading and superior anti-corrosion properties; Interlinked internal components