AR-15 trigger won't reset (UPDATED)

[LittleRedToyota]

when you say you "built it" do you mean you bought a lower parts kit and installed it?

if so, everything should fit and work without modification. i would think you have an out of spec lower, an LPK with some bad parts, or you put it together wrong.

the first thing i would do is take it all apart and put it back together again and see if that fixes it. if not, i would break out a micrometer to see if the lower was obviously out of spec. if not, i would contact the supplier of the LPK and and ask them to replace it with a new one.

[Lycanthrope]

Make sure the disconnector spring is in the right way. BIG end DOWN.

People mess this up all the time.

LycanbetInailitthrope

[lexnaturalis]

if not, i would break out a micrometer to see if the lower was obviously out of spec.

Do you have a source for the specs so I know what I'm measuring?

The trigger is all one solid piece, and it was wide enough that it brushed against the walls of the lower and I had to force it down. I just assumed that was normal.

So either my trigger is too wide or the lower is too narrow. I have a micrometer so it should be easy to check if I know what the proper measurements are.

[lexnaturalis]

when you say you "built it" do you mean you bought a lower parts kit and installed it?

Yes. Both the lower and the LPK are from Del-Ton, but I assembled them.

[DaveM55]

Could you list all the parts you used for the lower including the manufacturers name?

Well at least for the the trigger group?

[LittleRedToyota]

Do you have a source for the specs so I know what I'm measuring?

not off the top of my head. i will check some reference books at home tonight. i gotta think it is out there on the internet, though.

(but i would try lycan's suggestion first.)

[CrazyWhiteGuy]

LycanbetInailitthrope

big word...
you know i won't let you live it down if it is too big...

[lexnaturalis]

Could you list all the parts you used for the lower including the manufacturers name?

Well at least for the the trigger group?

Sure. Every single part came from Del-Ton.

I bought the lower at a local gun shop, but it's a Del-Ton lower. The LPK came directly from Del-Ton though, and I just used the standard trigger that came with it.

I assume they manufacture it themselves, but I have no proof of that one way or another.

[lexnaturalis]

Make sure the disconnector spring is in the right way. BIG end DOWN.

People mess this up all the time.

LycanbetInailitthrope

While I didn't use a micrometer to verify the big end was down, I eyeballed it. I suppose I can pull it out and measure to make sure.

I'll owe you a beer if my calibrated eyeball is off

[LittleRedToyota]

Yes. Both the lower and the LPK are from Del-Ton, but I assembled them.

well, that makes it relatively easy...at least you will not have to play "it's the other guy's fault" game.

maybe call del-ton and ask them about it.