MAXIMUM FIREPOWER! Our updated 170mm floorplate offers up to +12. We optimized for 9mm in this revision, giving 9mm "Open gun" drivers a chance to load TWENTY NINE and one in most cases. We've also re-profiled the interior to better accommodate the new "chisel-point" followers. This 170mm "+8" was our first mag extension, built for USPSA's "Open Division" in the 1990s. ("Open" is the firearm equivalent of top-fuel drag racing.) This latest version provides as much as +12 rounds of 9mm, depending on the particulars of your magazine/follower combination. Got a .40? We recommend our new .40-specific 170mm basepad. The 9mm version will work with the .40, but is finicky about bullet profile. Small changes make a big difference! Ships with a custom-made Wolff spring.
Note: Thanks to the hardware on the back, this basepad does not fit the USPSA gauge in the usual way. Luckily, appendix (E1) reads ". . .If a base pad does not conform to the configuration of the gauge, a ruler may be used to measure the overall length as pictured above."
Note: Due to U.S. State Department restrictions, we cannot ship this part internationally.
Note: California customers, please call us direct.
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Extension will not work with FMJ rounds. They will get stuck in the bottom of the base plate causing the spring and follower to bind leaving you with rounds falling out. Extension was working with Gold Dot Speer HPs due to the shorter OAL of the round compared to the FMJs. -- Response -- Looks like we failed on the communications end! If you need to run longer ammo (Winchester White Box RN is unusually long at 1.160) give us a call and we'll exchange your +12 for the .40 cal version. With a few small mods to the follower it works well with 9mm.