This is a 16 round magazine from the KJW/ ASG Mark-I High Power Airsoft Gas Pistol w/ Metal Hopup pistol as shown.
I never used it, I swear.
I have the pistol as a base for Greedo's DT-12 blaster.
As you can see a new magazine sells for $28.
I only want $15 for this.
Buyer pays P&P.