A spare magazine that is the original one that comes with the stock VFC G36 V2, one is never enough. This is the new version 2 magazine by VFC. Its able to carry more gas and take more abuse due to its tough polymer body.
Items included:
1x Umarex (VFC) 30rds Gas Magazine for G36 V2
*Note the V2 magazines would not fit the V1 G36(s)