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 AR15 upper assembly problem
#6643403
01/22/17 02:24 PM
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Joined: May 2011
Posts: 358
Matt Hejl
OP
Bird Dog
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OP
Bird Dog
Joined: May 2011
Posts: 358 |
This isnt my first build, but here is the deal:
I installed dust flap kit and forward assist kit. Then proceeded to install the barrel and the rest of the upper assembly (barrel, handguard, etc)
Well, when putting the upper onto the lower the front take-down pin wouldnt shut. To verify it was the new upper, I put another upper back on this lower and it closed up fine so its not an alignment issue.
My next step was taking the takedown pin completely out of the lower and seeing if it will go through the holes on the upper and it wouldnt so it appears the holes that house the front take-down pin are too small, or maybe the coating is just too thick?
It would be a pain to try and return because I have installed all the parts onto it...which I can take down, but is there a small amount of filing or milling I can do thats not risky to try and open up those holes?
I have read in several places that if I can just get the pins installed, after so many rounds it should start to wear itself open from the impact of the rounds.
any ideas or suggestions are welcome.
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Re: AR15 upper assembly problem
[Re: Matt Hejl]
#6643411
01/22/17 02:36 PM
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Joined: Aug 2012
Posts: 15,570
TexFlip
THF Celebrity
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THF Celebrity
Joined: Aug 2012
Posts: 15,570 |
What brand is the upper? Some use proprietary sized pivot and takedown pins.
Just to make sure that it is done thoroughly, I go both ways.
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Re: AR15 upper assembly problem
[Re: TexFlip]
#6643505
01/22/17 04:21 PM
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Joined: May 2011
Posts: 358
Matt Hejl
OP
Bird Dog
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OP
Bird Dog
Joined: May 2011
Posts: 358 |
Aero...The pin fits in the back...Just not the front. I haven't tried with Alot of force.
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Re: AR15 upper assembly problem
[Re: Matt Hejl]
#6643546
01/22/17 04:52 PM
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Joined: Nov 2006
Posts: 11,474
Driller
THF Celebrity
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THF Celebrity
Joined: Nov 2006
Posts: 11,474 |
Have you thought about drilling it out?
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Re: AR15 upper assembly problem
[Re: Matt Hejl]
#6643606
01/22/17 05:51 PM
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Joined: Aug 2012
Posts: 15,570
TexFlip
THF Celebrity
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THF Celebrity
Joined: Aug 2012
Posts: 15,570 |
I would lap the pin before I tried to bore out the hole.
Just to make sure that it is done thoroughly, I go both ways.
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Re: AR15 upper assembly problem
[Re: Matt Hejl]
#6643611
01/22/17 05:56 PM
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Joined: Nov 2012
Posts: 15,645
QuitShootinYoungBucks
THF Celebrity
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THF Celebrity
Joined: Nov 2012
Posts: 15,645 |
Mic the pin that fits and compare to the pin that doesn't?
![[Linked Image]](http://www.katiecortese.com/wp-content/uploads/2012/10/texas-tech-logo-2-150x150.jpg) https://web.archive.org/web/20170223065011/http:/www.rrdvegas.com/silencer-cleaning.html
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Re: AR15 upper assembly problem
[Re: QuitShootinYoungBucks]
#6643675
01/22/17 06:51 PM
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Joined: Sep 2016
Posts: 1,088
Creedmoor
Pro Tracker
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Pro Tracker
Joined: Sep 2016
Posts: 1,088 |
Try another pin and make certain that the upper is out of spec before you do anything. Do you have a set of calipers that you can use to measure the ID of the holes in the upper? That would tell you a lot.
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There's a fine line between BRAVE ... and STUPID.
The two most important days in your life are the day you are born and the day you find out why.
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Re: AR15 upper assembly problem
[Re: Creedmoor]
#6643753
01/22/17 08:06 PM
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Joined: May 2011
Posts: 358
Matt Hejl
OP
Bird Dog
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OP
Bird Dog
Joined: May 2011
Posts: 358 |
Try another pin and make certain that the upper is out of spec before you do anything. Do you have a set of calipers that you can use to measure the ID of the holes in the upper? That would tell you a lot. Yes I have some...I reload my own ammo. Thought about drilling yes, but didn't want to have to do that. I will take those ideas and come up with something. Will update.
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Re: AR15 upper assembly problem
[Re: Matt Hejl]
#6643771
01/22/17 08:31 PM
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Joined: Sep 2010
Posts: 7,133
SR025
THF Trophy Hunter
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THF Trophy Hunter
Joined: Sep 2010
Posts: 7,133 |
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Re: AR15 upper assembly problem
[Re: SR025]
#6644139
01/23/17 12:52 AM
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Joined: Aug 2011
Posts: 6,179
Tactical Cowboy
THF Trophy Hunter
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THF Trophy Hunter
Joined: Aug 2011
Posts: 6,179 |
Yup. Something is out of place. Take some measurements and see if it is something that is easily fixed. If not, contact the manufacturer and get a replacement.
The secret to a long life is to try not to shorten it.
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Re: AR15 upper assembly problem
[Re: Matt Hejl]
#6644190
01/23/17 01:20 AM
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Joined: May 2011
Posts: 358
Matt Hejl
OP
Bird Dog
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OP
Bird Dog
Joined: May 2011
Posts: 358 |
Ok...its just a tight fit. With a plastic ended mallet I tapped the pin in and it hinges, just tighter than any of the other guns I have built. I am almost certain with time, it will loosen up, especially after shooting it.
Thanks for the responses.
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Re: AR15 upper assembly problem
[Re: Matt Hejl]
#6644247
01/23/17 01:53 AM
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Joined: Aug 2011
Posts: 6,179
Tactical Cowboy
THF Trophy Hunter
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THF Trophy Hunter
Joined: Aug 2011
Posts: 6,179 |
Nothin wrong with a snug fit 
The secret to a long life is to try not to shorten it.
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