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I've been slowly replacing using Armist bb's with bioval bio bb's.. my TM MP5 doesn't fire Armist bb's, misfeed every 2 rounds. Bioval BIO bb's are great! I currently use .25 in my Classic Army UMC and .20 in my TM MP5... and I've yet to have any misfeeds.. every last bb always feeds. For bio bb's, these are better than non-bio.
I'm going to stick with Bioval from now on.
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