Trigger issue

[vlady]

So I got to building my lower last night. This is my third lower build and I've never had any issues so I'm puzzled. Installed the trigger and hammer, spring are facing the right way, but the disconnector hangs on the hammer and pulling the trigger does not release the hammer. If I push down on the disconnector, it released the hammer and then I can pull the trigger and release the hammer. Hoping you guys can help me diagnose my trigger problem. This is on a 80% with a regular mil spec trigger group.

[LCU1670]

is the disconnector spring in correctly, fat side down?

[vlady]

is the disconnector spring in correctly, fat side down?

yes it is.

[SoldierLife7]

I have a friend that recently had a similar issue.. the forward (hammer) pin holes were out of spec causing the hang up.

I would take some precise measurements of pin location, and ensure that they are in the right spot.

[vlady]

I'll get some calipers and check. The KNS pins and bracket fit perfectly so then both the hammer and trigger pins would have to be off. This jig was used by my dad too and his didn't have any issues.

[TWheeler45]

Simple check is if you have another rifle around with a trigger that functions properly, pop it in and see if it works. That could be a simple way to rule out the holes being out of spec versus an issue with the trigger components...

[gemini1]

So if you push the disconnector to release the hammer, does the trigger reset? If it does, then maybe check your trigger spring again. Either its too weak or installed incorrectly.

[vlady]

So if you push the disconnector to release the hammer, does the trigger reset? If it does, then maybe check your trigger spring again. Either its too weak or installed incorrectly.

Yes it does. I've checked the hammer spring twice already, removed and re-installed.

[ar15barrels]

So I got to building my lower last night. This is my third lower build and I've never had any issues so I'm puzzled. Installed the trigger and hammer, spring are facing the right way, but the disconnector hangs on the hammer and pulling the trigger does not release the hammer. If I push down on the disconnector, it released the hammer and then I can pull the trigger and release the hammer. Hoping you guys can help me diagnose my trigger problem. This is on a 80% with a regular mil spec trigger group.

Your disconnector is out of time.
It could be bad parts or the lower is out of spec.
Easy fix is to re-time the disconnector to that specific lower and fire control parts.

[vlady]

Pm'ing you Randall.

[mnichols]

I had the same problem on my poly80...

If youre 100% sure that your lpk is installed correctly, it could be your trigger hole is slightly too small or shifted too far foreward. it could also be the floor of your lower is not deep enough, or trigger/hammer pins out of spec.

These were my issues which created the same problem, YMMV

Good luck

[vlady]

Tried the ACT from other build which functions perfectly and same issue on this lower. So I'm left with either modifying the trigger group to work or modifying the lower as the pin holes must be off. Going to see Randall ASAP

[vlady]

Took a leap and went to town with the file and grinder. I was able to get everything to function properly. It was very close and required a small amount of material to come off the tooth of the disconnector and a small amount off the top of the trigger assembly by the safety as that wouldn't engage correctly either. All good now and waiting for the bolts to come in and then off to the range to sight in

[gemini1]

Any pics of the mods you did?

[vlady]

Any pics of the mods you did?

I'll snap some when we fix my neighbor's as we both used the same jig and have the same problems.