You have to use a good light, hold the hop up unit upside down. Look inside, you'll see a small rectangular hole, that's where the peice that fell out goes. Have to cover the end of it, drop the rubber peice in and try to roll it into the hole. Use a small screwdriver or similar to position it sideways in that hole, then slip the barrel with the hop up sleeve into there. That should make it all good. Check by shining a light down the barrel, look in the other end, and move the hop up dial full on and full off. You should see the nub get pressed into the barrel. Good luck SlipStream! It's tricky, but nowhere near as tricky as installing a new hammer spring into a KSC Glock 19! Hehe, did a LOT of this: :banghead:
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