2011 Magazine Extension for 140mm & 170mm Mags by Springer Precision

Springer Precision 140mm / 170mm basepads for STI/SVI 2011 are CNC machined from aluminum and hard anodized for a long service life. These basepads for 2011 magazines include special flaring that makes installation and removal much easier than many conventional basepads. We’ve also made a subtle relief cut “well” within the basepad that gives you a little more room for spring compression. 

The unique locking mechanism allows a very solid attachment with a simple backing out of the discrete set screw. They fit the USPSA magazine gauge for 140mm and 170mm mags. The unique attachment design provides a low profile, sleek design that is very stable and easy to remove.

.448oz

*We include a .050 hex driver that makes installation and removal a breeze. 

Custom engraved and custom colors are non-returnable.

*Designed to fit on 140mm / 170mm STI and SVI magazine tubes. 

**Disclaimer: As with all competition geared changes, always make sure you test and check your gear before you take it to a competition setting.  With 140mm/170mm magazine configurations especially, check the magazine in a USPSA 140mm/170mm gauge to make sure it fits.  With mass produced items like magazines, sometimes they can vary slightly from one to the next, often in the magazine lips that connect with the magazine extension/basepad.

Grams Extra Capacity Follower Kit

Please read the four options below carefully.

FKS-11 - For use in STI (1st & 2nd gen)/SV/SPS/CR mags (all calibers - except 1st gen STI mag, 9mm x 19mm spacer plate configuration), that measure up to 145mm long with a base pad attached.

FKS-13 - Same as above but for up to 171mm magazine length.

FKS9-11 - For use in STI (1st gen, 9mm x 19mm) magazines WITH spacer plate installed, that measure up to 145mm long with base pad attached.

FKS9-13 - Same as above but for up to 171mm magazine length.