2nd round is always a light strike. - Page 1

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[ARCHIVED THREAD] - 2nd round is always a light strike.

Posted: 5/24/2016 3:38:41 PM EDT

Aero precision build with cmc trigger and a 223 wylde barrel.

I built it about a year ago and it has been a tack driver and worked like a charm. Couple hundred rounds through it, suppressed and un suppressed.

Recently, it will fire the first round, eject it, load the second round, and then click light primer strike. I manually cycle it, boom, click, repeat.

I swapped out lowers and the upper runs fine.

However, even with another upper the lower does the same thing.

Is it my trigger or my buffer tube spring? Please help!

Posted: 5/24/2016 5:21:46 PM EDT

[#1]

its something in the fire control group ... maybe a spring broke or is worn or you could have a hammer spring installed wrong . I would also check the trigger pins and make sure one didn't crack or break

Posted: 5/24/2016 5:27:53 PM EDT

[#2]

Kinda sounds like the carrier isn't closing all the way. Can you shoot a round, tap the forward assist and then fire again?

Posted: 5/24/2016 6:28:41 PM EDT

[#3]

Quote History

Quoted:

its something in the fire control group ... maybe a spring broke or is worn or you could have a hammer spring installed wrong . I would also check the trigger pins and make sure one didn't crack or break

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CMC trigger which is enclosed in a metal case from the manufacturer. I will take it out and try another trigger. Sucks because it was expensive.

Posted: 5/24/2016 6:29:24 PM EDT

[#4]

Quote History

Quoted:

Kinda sounds like the carrier isn't closing all the way. Can you shoot a round, tap the forward assist and then fire again?

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I don't like forward assists so this rifle doesn't have one. Could this be from a weak buffer tube spring?

Posted: 5/25/2016 12:47:48 AM EDT

[#5]

Quote History

Quoted:
I don't like forward assists so this rifle doesn't have one. Could this be from a weak buffer tube spring?

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Quote History

Quoted:

Quoted:
Kinda sounds like the carrier isn't closing all the way. Can you shoot a round, tap the forward assist and then fire again?

I don't like forward assists so this rifle doesn't have one. Could this be from a weak buffer tube spring?

Maybe. If the FP is at the short end of the tolerance range, and the action spring at the weak end of the tolerance range. Easiest/cheapest way to determine is to change parts. And along the way, a thorough cleaning/lube might be a good idea.

Posted: 5/25/2016 7:29:46 AM EDT

[#6]

Quote History

Quoted:

I don't like forward assists so this rifle doesn't have one. Could this be from a weak buffer tube spring?

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:

Kinda sounds like the carrier isn't closing all the way. Can you shoot a round, tap the forward assist and then fire again?

I don't like forward assists so this rifle doesn't have one. Could this be from a weak buffer tube spring?

Possibly, it could also be slightly under gassed. Is it locking open on the last round?

Posted: 5/25/2016 8:27:32 AM EDT

[#7]

Is the trigger group completely enclosed, or just partially encapsulated? The only thing I can think of, is something is slowing down the hammer. Maybe a primer or other debris got in there somehow.

I would also check the recoil spring and buffer. Make sure neither is broken or damaged.

If it has some kind of dorky bolt release lever, make sure you are not actuating it, or maybe it is actuating itself during firing, causing a drag on the carrier during cycling.

Posted: 5/25/2016 7:24:51 PM EDT

[#8]

Quote History

Quoted:

Possibly, it could also be slightly under gassed. Is it locking open on the last round?

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Quote History

Quoted:

Quoted:

Kinda sounds like the carrier isn't closing all the way. Can you shoot a round, tap the forward assist and then fire again?

I don't like forward assists so this rifle doesn't have one. Could this be from a weak buffer tube spring?

Possibly, it could also be slightly under gassed. Is it locking open on the last round?

To be honest I don't know if it is locking open. I don't think it is under gassed. I put the upper on a different lower and no problems.

Posted: 5/25/2016 7:27:30 PM EDT

[#9]

Quote History

Quoted:

Is the trigger group completely enclosed, or just partially encapsulated? The only thing I can think of, is something is slowing down the hammer. Maybe a primer or other debris got in there somehow.

I would also check the recoil spring and buffer. Make sure neither is broken or damaged.

If it has some kind of dorky bolt release lever, make sure you are not actuating it, or maybe it is actuating itself during firing, causing a drag on the carrier during cycling.

View Quote

It is a CMC, so only partially enclosed.http://www.cmctriggers.com/products/standard-triggers/standard-trigger-curved/

I think I am going to replace the buffer spring assembly and see what happens.

Next I will pull the trigger and put back in the milspec one. The trigger may be going back to CMC.

[ARCHIVED THREAD] - 2nd round is always a light strike.

AR-15 » Troubleshooting

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