Trigger fails to reset then rifle doubles/triples (burst)?

[LoneStarM1A]

Question, I have an AR-15 (not M16) with a Noveske 14.5" upper.

The Lower is an LRB Arms receiver with a Geissele super 3 gun trigger. I assembled the lower.

Today I shot 400 rounds. The rifle was clean at the beginning of the day. I was shooting prone from a bipod. At about shot number 350, the trigger failed to reset (i.e. a round was chambered but the trigger wouldn't move so I had to use the charging handle to eject the live round, cock the hammer, and chamber another round).

The next shot was an inadvertent two round burst. The next shot after that was a triple burst. Then I shot another 45 rounds or so without incident.

I have verified that the springs in my fire control group are correctly installed and are in good shape. Should I replace the FCG and/or send the Super 3 Gun trigger back to Geissele and let them know what's happening? Should I just take the gun to a good gunsmith?

To be honest it has done this a few times before as well - also when the gun was fairly dirty.

Thoughts?

[Cincinnatus]

Question, I have an AR-15 (not M16) with a Noveske 14.5" upper.

The Lower is an LRB Arms receiver with a Geissele super 3 gun trigger. I assembled the lower.

Today I shot 400 rounds. The rifle was clean at the beginning of the day. I was shooting prone from a bipod. At about shot number 350, the trigger failed to reset (i.e. a round was chambered but the trigger wouldn't move so I had to use the charging handle to eject the live round, cock the hammer, and chamber another round).

The next shot was an inadvertent two round burst. The next shot after that was a triple burst. Then I shot another 45 rounds or so without incident.

I have verified that the springs in my fire control group are correctly installed and are in good shape. Should I replace the FCG and/or send the Super 3 Gun trigger back to Geissele and let them know what's happening? Should I just take the gun to a good gunsmith?

To be honest it has done this a few times before as well - also when the gun was fairly dirty.

Thoughts?

Did this happen with any other FCG other than the Geissele? I would call Geissele first thing Monday morning and send them the lower and the FCG to inspect.

[LoneStarM1A]

Thanks for the response.

This Geissele is the only FCG the lower has ever had in it, so no, I haven't experienced the issue otherwise.

[Rattlehead]

Question, I have an AR-15 (not M16) with a Noveske 14.5" upper.

The Lower is an LRB Arms receiver with a Geissele super 3 gun trigger. I assembled the lower.

Today I shot 400 rounds. The rifle was clean at the beginning of the day. I was shooting prone from a bipod. At about shot number 350, the trigger failed to reset (i.e. a round was chambered but the trigger wouldn't move so I had to use the charging handle to eject the live round, cock the hammer, and chamber another round).

The next shot was an inadvertent two round burst. The next shot after that was a triple burst. Then I shot another 45 rounds or so without incident.

I have verified that the springs in my fire control group are correctly installed and are in good shape. Should I replace the FCG and/or send the Super 3 Gun trigger back to Geissele and let them know what's happening? Should I just take the gun to a good gunsmith?

To be honest it has done this a few times before as well - also when the gun was fairly dirty.

Thoughts?

You need to contact Geissele, it's a tolerance stack up issue that I've had with two other S3G triggers. Geissele was extremely helpful and got the problem fixed literally within a week. They're great people to deal with.

It's worth noting that the S3G was in a LT lower when it doubled.

[MarkG]

You need to contact Geissele, it's a tolerance stack up issue that I've had with two other S3G triggers. Geissele was extremely helpful and got the problem fixed literally within a week. They're great people to deal with.

It's worth noting that the S3G was in a LT lower when it doubled.

If it were a tolerance tacking issue, I have to believe it would have shown up immediately. I just find it hard to wrap my arms around the possibility that the trigger so close to being out of spec that it only took 350 rounds for it to fail.

[Rattlehead]

If it were a tolerance tacking issue, I have to believe it would have shown up immediately. I just find it hard to wrap my arms around the possibility that the trigger so close to being out of spec that it only took 350 rounds for it to fail.

That's straight from Geissele.

[MarkG]

That's straight from Geissele.

I don't doubt that is what Geissele said. They are in a tough position though because the quality of the receiver is beyond their control and is a more likely cause of trigger/disco/hammer timing issues.

[backspur]

You might push the pins out and check them. I was having a similar issue that was caused by the trigger pin shearing at the spring groove.

[glockshooter]

It is the trigger being inadvertently bump fired. It happens with the S3G probably more than any other Geissele trigger it happens because the extremely short reset. This is a not a new thing with that trigger. I have had the exact same problems with mine when I first got it. Once I figured out what was happening and what caused it I was able to keep it from happening. The problem occurs mostly when the shooter doesn't have the rifle firmly in their shoulder. Usually happens in the prone or in an usual position where I could not shoulder the rifle as firmly as normal. Geissele will offer to send you a heavier trigger spring.

Matt

[WadeP]

Get off the bipod and on your hind legs and see if the problem goes away. I think inadvertent bump-fire is the most likely cause.