Our Indian Creek Design, Inc +4/5 magazine extension is milled from 6061-T6 billet and fits on any Canik 9mm magazine for the TP series of pistols, but it truly SHINES on the TP9SF Elite SC (Subcompact) model where it extends the grip on the SC 12 round magazine to a usable FULL GRIP both in length AND front to back, without massively sacrificing concealability. You can add our ICD +4/5 extension and get 17 rounds in each mag and enjoy a full grip while shooting with it. Comes with 2 piece mag extension, hardware, and installation instructions. Uses OEM mag spring (tested thoroughly with OEM springs with zero issues).