Did you open the mechbox and inspect the piston? Two of my team mates had jammnig problems which leads to a stripped/damaged piston teeth if fired in full auto while jammed. One of my buddies was running a systema tightbore and it didn't like Madbull BB's. The other was running a Prometheus and it doesn't like BB Bastards. Both switched brands (to KSC and Excell I believe) and have had no more jamming problems. Oil sometimes fixes it but if you still get persistent jams, switch BB brands immediately. Make sure to clear jams in SEMI AUTO ONLY!!!

Further explanation on the jamming/piston shredding issue can be found here (near bottom): http://www.airsoftcanada.com/showthr...346#post786346

Safest way is to use loading rod/cleaning rod. Trust me clearing jams on semi or full auto is not the way. Chances are you will break the tappet plate.

my two cents.

You're right, the best way would be the cleaning/unjamming rod but I meant out in the field. No one I know carries one in the field and it's a pain to walk back to the vehicles some times. Hell I went through the magwell/hopup with a skinny stick in the field to clear a jam as it wouldn't clear on semi, haha. Worked too:D I've always cleared my jams in semi auto with the mag out and shooting upside down...not entirely sure why, I just think I read that somewhere. It's worked 90% of the time for me and haven't broken any parts doing so (I have yet to strip a piston or break a tappet plate on any of my guns).

Why would it break the tappet plate? Shouldn't make a difference if it is short stroked due to a bb not allowing it to move all the way forward; the cam on the sector gear will come around and pick it up still - no teeth to strip. A bit of added stress in the corner where it 90's up to hold the nozzle but I don't see the little tappet spring exerting enough speed and force to have it break there in the odd time it occurs. I'm not trying to be a dick, I'd honestly like to know why it would break.

Clearing jams by firing semi or full is asking for trouble. If the gun jammed odds are there's a reason, more than likely there's something in the chamber. AEgs' come with a CLEANING & unjamming rod for a reason. If your gun jams "out in the field"-walk off and go clean you fraken barrel. If you just shoot it out or jamming a small stick in the chamber, you could be damaging your hop-up rubber and or grinding debri down your soft brass barrel and scratching the shit out of it. ww2warrior if your hearing grinding gears-oiling your hop-up isn't going to do shit. If you openned your mechbox and don't see anything wrong, and it's still making that sound-take it to a tech because you must have overlooked something.

Picture a jammed bb(2 BB'S stuck in the chamber is worse) in the chamber then pull the trigger on semi or full just clear it increases stress on the back of tappet plate(sector cam contact). Other part that is also prone to damage is the nozzle. Hard to explain the rest but for my years in experience fixing Aeg's with broken tappet plate, bb jamming is one reason why.

Please clarify. The jam will cause the nozzle/tappet plate to not be able to return forward (forward=front of gun) all the way. This will not affect how the cam picks up the follower except that it will be in a slightly different spot on the follower. There is no binding that could occur.

Where do you find the tappet plates breaking? How can you tell it's from a jam (ie. they break while firing w/ a jam or other evidence?) I've only been fixing guns since this winter but I've yet to see a tappet plate break. Still trying to learn myself.

Also, I've seen a bit of silicon oil in the hopups/mags fix MANY firing issues. Sometimes a BB brand switch is needed. Sounds like it did the trick for ww2warrior as well.

Firing in full-auto with a jam WILL cause you're piston to strip, I'm not just talking out of my ass here. You'll hear a lower pitched, gut turning grinding noise (it's not a metal on metal grind which is usually higher pitched). Exact same thing happened to 2 of my team mates after they fired full auto with jams. I replaced both pistons myself. They both had to use a different brand of BB's.

Hey Guys, wow thanks for all the feedback. For now, Looks like the problem is solved, I just oiled the Hop-Up with sillicone oil and for now it's working like a charm, i'll give you more feedback when I'll field the gun next weak.