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Finally, the Legends M1A1  fully automatic BB carbine has the magazine that airgun fans wanted all along, the Drum Mag!  This magazine holds 450 BBs and three 12 gram CO2 cartridges so you can hang on that trigger as long as you would like. Are you ready for more good news?  This magazine works on the original Legends M1A1 as well as the new version (M1A1-D) that ships with this Drum Magazine. If you aren't already buying BBs and 12 gram CO2 in bulk, you will certainly want to start!