Quote:
Originally Posted by Con Murder
I'm sure the piston was fine if it was the tappet spring like you say...
Anyway, OP I have an m4 I am helping a friend fix up that has the same problem from a simple barrel swap. We find it shoots about a hicap before it stops ejecting the bbs. This is due to some movement between the ho-up unit and the mechbox, we can push them back together while it is assembeled (through the dust cover) and 'fix' the air leak for a couple dozen rounds but then its beat again. It seems the outer diameter of the new barrel allows some play and so now the entire hop-unit is no longer tight. To fix this I am going to place an o-ring around the barrel/ hop-unit to keep the unit from having any extra room. If yours exhibits the same symptoms feel free to pm me for a follow up, its going down this weekend.
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did you forget to put the spring that goes in front of the hopup unit? (see pic)
