The SGP2 follower and 11-coil spring kit that takes a Mec-Gar 18-round P226 tube with a CRS Comp Basepad to a reloadable 23 rounds, at the cost of slide lock-back.
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This is the 23-round answer. The kit is a Grams-format SGP2 follower and an 11-coil spring, specified for Mec-Gar 18-round P226 9mm tubes that measure up to 145mm assembled with a base pad on. Paired with the CRS Comp Basepad it yields a reloadable 23 rounds, which is the highest published number on a P226 magazine.
The trade is printed on the box: the follower will not activate slide lock. An empty gun will not lock back, so the reload cue every shooter builds on a P226 goes away and gets replaced by a dead trigger. That is a training change, not just a parts change, and it is the reason the 11-coil spring with a stock follower exists as the 22-round alternative.
Get the part number right. Grams publishes FKSGP-11 and FKSGP-13 for the P320 and P250, and those use the SGP follower. The P226 kit is FKSGP2-11 with the SGP2 follower. Grams also notes that follower kits cannot be returned once the packaging is opened, and that a magazine tube outside normal tolerances may need tuning to reach the published round count.
Add the Grams Engineering P226 No Lock-Back Follower Kit (FKSGP2-11) to your build and see how it enhances your platform.