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.
2 Reviews Hide Reviews Show Reviews
Fit and finish very nice. Only reason for 4 stars, you have to do some filing of the follower for it to get passed the lip on the inside of the mag to extension meeting. Other than that very nice.
That's a common problem. We'd rather you have any problems you're going to have putting the ammo IN, rather than having problems getting the ammo OUT. -- Robin Taylor
Installed it and it only added 2 rounds. On a 33 round mag when it’s states + 12
Hey Scott, printed on the back of the packaging you'll see instructions on how to fix this issue. A swipe of a file on the bottom corners of the follower is usually enough -- you'll find a detailed version of how to fix this in our youtube video support.