How do you know you have a bad Hop-Up

[porthose]

I have an M4, and ive been shooting it a lot for a week now. And everytime im shooting i will set my hop up and it will shoot well for about 20rounds and then it will start dipping down. So then i will crank it back up, and it will do the same thing over and over. Everytime i open up my hop up it seems like it has fallen back down. If the problem is that the hop up just goes back after i shoot a bit. Shood i put something in their like a peice of tape to keep it from going back down.

Any suggestions will be helpful.

[bait]

i heard this is common w/ the m4s umm i dont really know what to tell you but from what ive read about the m4 this has happened to a lot of people even though it doesnt seem to happen after 20 rounds to them.

[Bigmack]

this is the problem with all TM M4's. not much you can do about it...i wouldn't use locktite since that stuff likes to eat plastic...

Classic army is coming out with a rotary hopup, i belive..

[dicepackage]

If it really gets to be a problem maybe you could consider using a rifled barrel. I believe they get slightly more FPS then a rifled barrel but aren't meant to be used with hop-up.

[frostee]

The problem is with the retaining screw that holds the adjustment wheel onto the hop-up body. The stock TM hop-up it is made of black plastic and the retaining screw is threaded into that black plastic. As you shoot a little torque is transfered back into the hop-up and subsequently into the adjustment wheel.
You can see this in action if you hold open the fake bolt (pull back the charging handle) while you shoot. You will probably be able to watch the adjustment wheel "unwind" from its desired position.
To correct this you must very carefully tighten the screw holding the adjustment wheel to the body. Be very careful, because you can easily strip the threads. You want just a little bit more tightness in the wheel, not a lot. It still must be free enough for you to adjust.
Another method of fixing this problem is to replace the hop-up with a Systema metal hop-up. The metal hop-up body holds the retaining screw a little more securely, but it also requires grinding to fit most stock TM bodies.

[Knief]

Newman installed the systema metal hop-up into his gun (cut away the boddy rather than the hop unit) and it increased his accuracy and range by a ton. If you have the money, you might want to think about this option as more of an upgrade rather than just a solution.

[porthose]

Ok guys thanks for the info, i'll talk to newman, him and I are on the same team so i'll ask him.

Sorry i couldnt respond earlier my computer was being goofy.