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View Full Version : AR-15 Trigger malfunction (solved)


wooward
11-01-2010, 10:53 PM
While testing out my friend's AR-15 lower, I noticed that after releasing the trigger, the hammer sometimes drops. Basically, while the hammer was uncocked, I squeezed and held the trigger, and then cocked the hammer. After releasing the trigger, the hammer should remain cocked, but sometimes it would drop. I believe this would cause an unintentional discharge if used to fire a round. Short of buying a new lower parts kit, any ideas on what part has failed? Below is a list of the installed parts and a few pics I snapped. Thanks in advance.

Territorial Gunsmith SLR15 Lower
Stag Arms or RRA Lower Receiver Parts kit
JP Enterprises Yellow Springs (JPS3.5).


::Edit:: Turned out to be an upside down disconnector spring.

http://i18.photobucket.com/albums/b116/wooward/AR-15/DSC_9044Medium.jpg

http://i18.photobucket.com/albums/b116/wooward/AR-15/DSC_9045Medium.jpg

http://i18.photobucket.com/albums/b116/wooward/AR-15/dspring.jpg

socal-ar15
11-01-2010, 10:59 PM
I would say you have a problem with the disconnector or hammer. Has any work been done on these parts like polishing?

BAGunner
11-01-2010, 11:01 PM
The spring that engages the disconnector.
Also JP low power springs are intended to use with JP trigger group, otherwise you might see FTF

UserM4
11-01-2010, 11:02 PM
Try a new disconnector.

wooward
11-01-2010, 11:26 PM
I would say you have a problem with the disconnector or hammer. Has any work been done on these parts like polishing?

No work done on these parts. Basically just installed and I believe he went to the range once. I think about 100 rounds have been through it.

The spring that engages the disconnector.

For clarity, the disconnector spring is the little spring between the trigger and disconnector?

I'll tell him to get a new hammer, disconnector, and disconnector spring. Should he get a new trigger as well?

socal-ar15
11-01-2010, 11:29 PM
yes. check the hammer and disconnector for damage and make sure the diconnector contacts the hammer.

NiteQwill
11-02-2010, 7:23 AM
Your disconnector spring is upsidedown.

sniper4usmc
11-02-2010, 7:39 AM
Your disconnector spring is upsidedown.

agree,but I think that is called Trigger Spring

NiteQwill
11-02-2010, 7:47 AM
agree,but I think that is called Trigger Spring

No, it's called a disconnector spring. If it's upsidedown, it fails to engage the hammer on trigger release, sending the hammer forward (auto).

http://i78.photobucket.com/albums/j87/rsidner/AR%20assembly/lowerKit.gif

sniper4usmc
11-02-2010, 7:48 AM
No, it's called a disconnector spring.

http://i78.photobucket.com/albums/j87/rsidner/AR%20assembly/lowerKit.gif

how do u know disconnector spring is upside down?????? you cant see them:confused:
dinsconnector spring sit between trigger and disconnector..

NiteQwill
11-02-2010, 7:51 AM
how do u know disconnector spring is upside down?????? you cant see them:confused:

Yes you can. Look at an angle in your FCG. The disconnector spring is tapered. The WIDE end should go towards the trigger. If upsidedown, it's inoperable.

http://www.ar15armory.com/Guides/trigger.gif

Vtec44
11-02-2010, 7:53 AM
I'm wondering if the disconnecter spring is even there...

NiteQwill
11-02-2010, 7:54 AM
Here's another:
http://i76.photobucket.com/albums/j36/creampuff464/DSC_3104.jpg

Peter.Steele
11-02-2010, 8:06 AM
Your disconnector spring is upsidedown.


I don't think his disconnector spring is even there. Look in his second picture, you can see the whole lower edge of the disconnector. The light's just right, very hard light. Spring's missing entirely.

Merc1138
11-02-2010, 8:08 AM
I'm wondering if the disconnecter spring is even there...

Doesn't look like it is in the second picture. You can see the open space under the disconnector.

bjl333
11-02-2010, 8:16 AM
Take the fire control group out and inspect for all the stuff said above. If in doubt go to a knowledgable gun shop and let them take a look.

NiteQwill
11-02-2010, 8:16 AM
There we have it. ;)

Your disconnector spring is NOT upsidedown.... it's MISSING! :eek:

wooward
11-02-2010, 9:53 AM
The spring is there. It's hidden cause of the camera flash. I checked that first cause of another thread I read about a guys AR15 who went full auto. It could be upside down though. I won't see my friend till the weekend. I'll help him take it apart then and update. Thanks for all the help.

*Edit* I looked at the 2nd pic again. You can see the spring but its dim. It's a half circle below the disconnector. Looks like a smile. Added a zoomed in view at top.

Whiskey84
11-02-2010, 9:57 AM
Failure to install the disconnect spring properly can lead to an automatic fire condition. Believe me...

wooward
11-28-2010, 3:24 PM
Forgot to update this post. We took apart the trigger and discovered that the disconnector spring was installed upside down. We also replaced the Yellow Springs with the original. All seems fine now. Thanks for all the help.

intheknow
01-19-2011, 12:56 PM
There we have it. ;)

Your disconnector spring is NOT upsidedown.... it's MISSING! :eek:

LOL