APS 23rds Co2 Magazine for D-Mod. 
This magazine is made of metal and fully compatible with aftermarket airsoft guns using the similar design.
The capacity of this magazine is 48rds.
It takes 1 x 12g Co2 Canister and the valve + O-Ring are reinforced to accept extreme strong pressure of Co2 gas.
The end cap of the magazine has patented design of better gastification of Co2. 
Suitable for APS ACP601 / TM G17 Series GBB Pistol.