BENELLI M4 +1 Canadian Legal MAG EXTENSION
$99
https://www.sjhardware.com/product/b...mag-extention/
This will allow +1 round of 3 inch magnum shot shell in a limited cap factory mag tube.
No tools needs
Use factory spring machined from solid 4140 steel
Controlled gas nitride finish
no# new spring is needed as factory spring works perfect
Made in Canada