CZ 457 mag extensions + springs

Available are:

1. Position 7 mag extension + spring: available

$35

One of these:

https://bossgear.ca/product/position-7-cz457-magazine-extension-with-spring/

$35 includes shipping as an oversized untrackable letter in Canada

Save yourself some tax and shipping cost

2. no name mag extension + spring: available

(honey comb pattern shown in picture)

Purchased both from Gunpost.

$25 includes shipping as an oversized untrackable letter in Canada

I couldn’t make them work on my mag – I’m pretty sure it’s my mag or follower. 

Both mag extensions and springs are unmodified.

Buy both for $55 and save on shipping cost.