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Topic starter
You need an m4 style hop unit, if you're wanting one cheap you're best off scouring zeroin or the like for a second hand one. If not buy a new one
http://www.airsoftworld.net/element-air ... -sets.html
select m4 type from the drop down box, the element hop units are excellent but you may want to re-check fps afterward as you can gain a fair bit from them!
Posted : 22/05/2012 9:31 am
Topic starter
They are just as durable as the metal hop units and in my (and most other peoples) opinion far better performing than a metal one, hope it helps mate 
Posted : 22/05/2012 10:58 am
