AR No go BANG!
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Old 10-15-2014, 01:01 AM   #1
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Default AR No go BANG!

I had been patiently waiting almost 3 weeks for my trigger, the last part needed, to arrive and yesterday it came in. I was stoked! By the time I got home and got it installed it was too late for me to try it out so I waited until this morning. When I was finally able to see to shoot I went out and anxiously squeezed the trigger CLICK! Ok bad primer, so I cycle it and the round is hanging up on the bolt face, I pop it off and chamber another round again I anxiously squeeze the trigger, again CLICK! Neither round had been struck by the firing pin, and again the round is hung up on the bolt. I swapped the bolt carrier group and again the same issue. I swap uppers and bang, so I try the upper on a different lower and click! The takedown pins are stiff with the problematic upper compared to others. What are your thoughts as to what the problem may be? Any idea is appreciated. This isn't my first build, but it is my first complication with a build. Thanks guys.

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Old 10-15-2014, 01:37 AM   #2
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good detailed close up pics of the bolt group the chamber lug area and with the bcg installed and in the closed position from the ejection side and bottom.

also who made the upper and if you did what parts were used.

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Old 10-15-2014, 02:08 AM   #3
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Is the firing pin stuck in the bolt, or if not does it protrude far enough?

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Old 10-15-2014, 04:21 AM   #4
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If the bolt and upper are configured correctly the firing pin has to strike the primer, unless the pin is broken...it has no where else to go.

Process of elimination...

Is gas tube seating into gas key properly?
Is bolt facing proper direction with extractor to the right?
Are trigger springs installed properly?
Is bolt catch hanging up the hammer's forward movement?

Chamber a round and give forward assist a nudge, there should be little or no forward movement if everything is seating properly. If all else fails remove trigger group, check that the bolt slides freely and the gas tube properly seats in key, and that key is tightly stakes and oriented properly. Reinstall trigger and test, making sure the hammer doesn't slam into bolt catch.

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Old 10-15-2014, 04:42 AM   #5
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Ensure that the firing pin retaining pin is installed correctly and allowing the firing pin to travel fully forward.

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Old 10-15-2014, 05:25 AM   #6
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If your description of what happened is accurate, then it sounds like the hammer is not making contact with the firing pin because the new bolt and bolt carrier combination for your build is not going fully into battery.

Find out whether or not the bolt is firmly locked into the barrel extension after you cycle the weapon using a dummy cartridge or go gauge. If the locking lugs on the head of the new bolt are not completely locking up into the barrel extension when a cartridge is fed into the chamber, then the rifle should not fire. If it did fire, you might have a really bad day.

Your post seems to describe the result of a headspace issue caused by improperly machined or assembled parts or out-of-spec ammunition. When you assembled the parts for your new rifle, did you check to see if the bolt's locking lugs would lock into the barrel extension using a go-gauge and fail to lock on a no-go gauge?

If I ride the charging handle of my Colt carbine forward so that the locking lugs are not fully locked into the barrel extension and then I pull the trigger, I'll get a click, but the hammer will have contacted the rear of the bolt carrier instead of the head of the firing pin and that's a good thing.

If the bolt's locking lugs aren't fully locked into the barrel extension when you cycle the weapon to chamber a cartridge, then you do not want the weapon to fire.

If you had a light versus non-existent indentation on the primer, you may have improperly assembled the hammer spring when you installed your new trigger.

When you push on the ejector in your new bolt does it function normally? Can you depress the ejector all the way using the point of a ball point pen?

Take your rifle to a gunsmith. He should be able to sort these issues out pretty easily.

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Old 10-15-2014, 05:26 AM   #7
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Quote:
Originally Posted by SSGN_Doc View Post
Ensure that the firing pin retaining pin is installed correctly and allowing the firing pin to travel fully forward.
Forgot about that one, Doc. I figured he'd know how to properly install the firing pin but that will also cause a problem.
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Old 10-15-2014, 05:47 AM   #8
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Quote:
Originally Posted by kbd512 View Post
Forgot about that one, Doc. I figured he'd know how to properly install the firing pin but that will also cause a problem.
Done it when not paying attention once.
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Old 10-18-2014, 08:52 PM   #9
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Turns out that the upper is out of spec just enough to prevent it from firing. Something about it being too short. Thanks for the replies and assistance.

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Old 10-18-2014, 09:13 PM   #10
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laynejc,

What kind of parts did you buy! Sometimes is an effort to save money we buy inferior parts. Please list what brands you purchased. This should be a warning to others and no disrespect to you. Too many Jack the Hacks making AR parts if you know what I mean.

03

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