Beta c mag.

i had a couple. they where mostly good as i recall, as far as function

dowside: pain in the ass to load, no last round lock back on them and you better keep it clean inside and lubed with graphite.
 
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They work great on an M231 port firing weapon but I had issues with it on my M4 and my AR platform rifles. I might give it another try.
Their speed loader is the bees knees if you are using stripper clips.
 
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