Add the extension kit to your Glock 31/33-round magazine and transform it into a giggle-worthy 41+1 round BIG stick.
This is the same extension as the TF well-known 170mm +12, but it ships with a crazy-long machine-pistol spring.
Normally Delrin is used for Glock mags, but TF did these up in a beautiful red-anodized aluminum.
Available normally in the 9mm kit, but a .40/.357 Sig, is available by special order! TF can substitute in .40 parts that are used on a 22-round .40 mag, achieving 30+1! There is a DIFFERENCE between the 9mm and the .40, they are not interchangeable. Magazine body not included.
Disclaimer: We are not able to ship Internationally, due to U S State Department regulations (including Canada), as well as to US citizens living in States or cities that restrict hi-cap magazines. Please check your local laws carefully!