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This unit adds capacity to Generation 4 & 5 Sub-Compact, Mid, and Full Size Glock high capacity magazines. This magazine extension replaces the original floor plate and internal locking plate and adds two rounds to a 9mm; two rounds to a 40SW and 357SIG, and one round to a 45GAP magazine. This unit will not fit the 10mm or 45ACP models-copied from Google. So yes this will fit a Glock 17 gen 5. Hope this helps.

Yes this will fit on any Glock 9mm/40SW double stack magazines gen 4 or 5, Including the Gen5 G17

Jason, yes it will. This unit adds capacity to Generation 4 & 5 Sub-Compact, Mid, and Full Size Glock high capacity magazines.

Jason, absolutely yes Sir. It fits Gen4 & Gen5 Glock 17 Magazines no issue. Cheers and stay safe!