MP5 no single shot.

BobbyDangerous · February 7th, 2015, 19:56

Hey, I have a CYMA Mp5a5. And it won't shoot on semi. Just shoots full auto on semi. I swapped out the trigger assembly too with a G&P. Nothing is broken inside the gearbox. I don't know what's wrong with it. I've tried everything.

Janus · February 7th, 2015, 20:03

See the screw on the far left of this image? Sometimes that gets TOO tight and the little lever arm it holds down gets stuck. (This same problem happened to my MP5.)

Also, on the exterior of your mechbox there is a tiny spring that goes between your selector plate and that lever arm. Make sure it is there.

BobbyDangerous · February 7th, 2015, 20:10

Yeah I checked all that. The spring is there. I hate this thing lol. I even rebuild the box. I put in an MP5 Lonex box. So it's quality. All custom. I'll tear it apart for one last time and see if I can figure it out. But if anyone can think of anything. Let me know!! Thanx

BobbyDangerous · February 7th, 2015, 20:11

Oh. Of the trigger is worn out a little could that cause it?

Janus · February 7th, 2015, 20:49

Take a picture of it.

BobbyDangerous · February 7th, 2015, 20:54

I don't have it apart but where the trigger makes contact with the trigger assembly. The top. It looks like it's been filed down. On an angle. Or broken off.

Bellerophon · February 7th, 2015, 20:58

It could be that your trigger contacts are too close together, so it starts firing before the cutoff lever has a chance to engage. Try (gently!) prying the copper trigger contacts apart a few mm so that the trigger sled only completes the circuit with a full trigger pull. If after reassembling you find it doesn't fire at all, you've pried the contacts apart too far and need to push them together. Alternatively, the cutoff lever itself may be worn out, check that for wear. Last, as a sanity check, make sure the little cam on the left (bottom) side of the sector gear is actually pushing against the cutoff lever with enough force to disconnect the trigger sled from the contacts.

BobbyDangerous · February 7th, 2015, 21:05

Yeah I'm gonna tear it apart. One last time before I have a hairy. Lol.

lurkingknight · February 7th, 2015, 22:34

basically you want the contacts so far apart that they will only sandwich the shuttle block near the back of the trigger pull, so with the trigger in the half gearbox, hold it down and pull it like you were shooting, see how far the shuttle pushes forward and adjust the contacts accordingly. You want them to shift/come in contact lightly, not have the contacts pinch and hold the shuttle.

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February 7th, 2015, 19:56	#1
BobbyDangerous Trader rating Join Date: Mar 2010 Location: Oshawa	MP5 no single shot. Hey, I have a CYMA Mp5a5. And it won't shoot on semi. Just shoots full auto on semi. I swapped out the trigger assembly too with a G&P. Nothing is broken inside the gearbox. I don't know what's wrong with it. I've tried everything.

February 7th, 2015, 20:03	#2
Janus Trader rating Join Date: Sep 2004 Location: Red Deer, AB	See the screw on the far left of this image? Sometimes that gets TOO tight and the little lever arm it holds down gets stuck. (This same problem happened to my MP5.) Also, on the exterior of your mechbox there is a tiny spring that goes between your selector plate and that lever arm. Make sure it is there. __________________ Age Verifier - Lower Vancouver Island Brotherhood of Nod - Nod Prime \|\| Vancouver Island Airsoft League - President Unavailable for AV until April 2020.

February 7th, 2015, 20:49	#5
Janus Trader rating Join Date: Sep 2004 Location: Red Deer, AB	Take a picture of it. __________________ Age Verifier - Lower Vancouver Island Brotherhood of Nod - Nod Prime \|\| Vancouver Island Airsoft League - President Unavailable for AV until April 2020.

February 7th, 2015, 20:10	#3
BobbyDangerous Trader rating Join Date: Mar 2010 Location: Oshawa	Yeah I checked all that. The spring is there. I hate this thing lol. I even rebuild the box. I put in an MP5 Lonex box. So it's quality. All custom. I'll tear it apart for one last time and see if I can figure it out. But if anyone can think of anything. Let me know!! Thanx

February 7th, 2015, 20:11	#4
BobbyDangerous Trader rating Join Date: Mar 2010 Location: Oshawa	Oh. Of the trigger is worn out a little could that cause it?

February 7th, 2015, 20:54	#6
BobbyDangerous Trader rating Join Date: Mar 2010 Location: Oshawa	I don't have it apart but where the trigger makes contact with the trigger assembly. The top. It looks like it's been filed down. On an angle. Or broken off.

February 7th, 2015, 20:58	#7
Bellerophon Trader rating Join Date: Aug 2012 Location: Guelph, On	It could be that your trigger contacts are too close together, so it starts firing before the cutoff lever has a chance to engage. Try (gently!) prying the copper trigger contacts apart a few mm so that the trigger sled only completes the circuit with a full trigger pull. If after reassembling you find it doesn't fire at all, you've pried the contacts apart too far and need to push them together. Alternatively, the cutoff lever itself may be worn out, check that for wear. Last, as a sanity check, make sure the little cam on the left (bottom) side of the sector gear is actually pushing against the cutoff lever with enough force to disconnect the trigger sled from the contacts. __________________ Airsoft is where expensive things go to die.

February 7th, 2015, 21:05	#8
BobbyDangerous Trader rating Join Date: Mar 2010 Location: Oshawa	Yeah I'm gonna tear it apart. One last time before I have a hairy. Lol.

February 7th, 2015, 22:34	#9
lurkingknight "bb bukakke" KING! Trader rating Join Date: Jul 2011 Location: Ottawa	basically you want the contacts so far apart that they will only sandwich the shuttle block near the back of the trigger pull, so with the trigger in the half gearbox, hold it down and pull it like you were shooting, see how far the shuttle pushes forward and adjust the contacts accordingly. You want them to shift/come in contact lightly, not have the contacts pinch and hold the shuttle. __________________ I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.

MP5 no single shot.

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