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Madbull Airsoft Ultimate Hopup Unit for M4/M16 Series Airsoft AEG
by Debra L. Date Added: March 31, 2014
This is buy far one of the best hopup chambers on the market. However it can be a pain to install. I have it and so do two of my friends. When i got it it took a lot of tries to get it in perfect because it has such tight tolerances but once i got it installed right it worked like a charm. However both of my friends had to file a few millimeters off the front of theirs to get it to work with out jamming. But after getting it working it will hit a man size target 3 out of 5 times at 70 yds laser measured with a stock M4. Over all i think this is the best hopup on the market and would highly recommend it.

Rating: 5 of 5 Stars! [5 of 5 Stars!]
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