Make sure you’re prepared for whatever may come your way, and pick yourself up a spare 21 round magazine for your SIG SAUER M18 airsoft pistol. Constructed fully from metal alloy, this spare magazine option can withstand high impact drops, and offers a more authentic weight to your lowdown. Green Gas or propane powers this magazine, which is filled directly within. A high tension internal steel spring ensures rapid and smooth BB feeding from the magazine to the firing chamber, with less risk of jams. Extend your training sessions to further hone your skills, and pick yourself up a spare 21 round magazine today.