Green gas Magazine for GHK/Umarex airsoft Glock

I have this brand new, never used  ( just tested)  green gas magazine for Umarex/GHK Glock  airsoft pistol . 

These are selling new for $80 plus tax and shipping.

I am asking $50 plus  $20 shipping

Serious inquiries ONLY please !

Local pick up is also accepted in Limoges, Ontario ( About 25 min drive South East of Ottawa on Highway 417)