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Details
MAXIMUM FIREPOWER! TF tweaked their popular 170mm "+8" extension for 40 S&W, giving you a chance to load up to TEN additional rounds! That's 25+1!
They also re-profiled the interior to better accommodate the new "chisel-point" followers.
Details matter, so depending on which combination of mag tube/follower you're using, results vary between +9 and +10.
This extension can be used on a 22-round magazine, but requires a special spring.
Ships with a custom-made Wolff spring.