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Hello Kevin, With a Pearce magazine grip extension, you can use a Glock 23 magazine in your Glock 27, and the magazine extension will make it fit flush. When a Glock 23 magazine is inserted into a shorter Glock 27 frame, the base of the magazine will extend past the bottom of the grip. The Pearce extension bridges this gap, giving the gun a "factory" look and providing extra grip length for your hand. You can also use a full-size Glock 22 magazine in your Glock 27 with an adapter, though the magazine will still extend past the grip. Some users prefer this for the added ammunition capacity and improved grip. Hope this info helps Sir Kevin. Please take care and stay safe 🙏🏻

Hi Kevin and welcome. Flush fit magazine here: -- https://www.tildengun.com/products/magazines-glock-mf00285pkg-764503002854-4850 - The Pearce Mag Extension will always extend below the G27 base. - (might as well get a couple of extra rounds): -- https://www.pearcegrip.com/products/parts-mag-mag27-pgg4-pg-g4-installed-on-glock-27-magazine

Here's a Flush fit magazine for the G27. As mentioned though, any extension will drop the magazine base outside the magwell.

Kevin Sir,
By installing a Pearce magazine grip extension, you can use a Glock 23 magazine in your Glock 27 for a flush fit. When a standard Glock 23 magazine is inserted into the shorter Glock 27 frame, the base extends past the bottom of the grip. The extension bridges this gap, providing extra grip length.
Glock 40S&W 13 Round Blue Magazine for Glock 23: The standard magazine for a G23, this can be combined with a Pearce extension for your G27.

https://www.budsgunshop.com/product_info.php/products_id/13261/glock+40s%26w+13+round+blue+magazine+for+glock+23

ETS magazine for Glock 22 40SW 19RD: This aftermarket magazine offers a 19-round capacity for your G27 when combined with an adapter.

https://www.budsgunshop.com/product_info.php/products_id/24328/ets+magazine+for+glock+22+40sw

ProMag for Glock compatible 40 S&W G22, 23, 27 25rd Black Detachable: A high-capacity, aftermarket option that also works with a G22 magazine adapter in y