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-   -   AR15 buffer tube/ take down pin problem (http://www.firearmstalk.com/forums/f33/ar15-buffer-tube-take-down-pin-problem-103778/)

Firecontrol663 02-08-2014 01:39 AM

AR15 buffer tube/ take down pin problem
 
Hello everyone, I am new to this forum and this is my first post. I hope I am posting in the correct area.

I am new to AR15ing and am currently building one. I have a Colt AR15 .223. I recently installed a carbine stock to it and replaced the buffer tube. Everything is fine and feels good. When I pull the charging handle back with the take down pin pulled out it is very easy to rack back. When I push the take down pin in and pull the charging handle back it's very hard to pull. I don't understand what the problem is. Does anyone have any idea?

KG7IL 02-08-2014 03:13 AM

Welcome to the Forum.

Please stop by the Introductions http://www.firearmstalk.com/forums/f2 and introduce yourself. You will be met by the welcoming committee

Unless I am misunderstanding, the resistance would be the buffer spring. That is, IF the upper is swung open with the pin removed, and IF the upper is closed with the pin installed.

If this isn't the case, let us know.

JonM 02-08-2014 05:00 AM

Did you also get a carbine buffer and carbine buffer spring??

If your using the original rifle length as I'm assuming that's what you had since you didn't give us pics or a model number to go by... its not going to work that way

Colt makes and has made a LOT of different models ar15. Saying colt ar15 can mean a lot of things as they have been making them for half a century

danf_fl 02-08-2014 10:35 AM

It almost sounds like the bolt carrier is scraping on the pin (out = easy, in = hard).

When you disassemble for cleaning, get a punch the same diameter of the pin and see if the carrier rubs on the punch.

In other words, try to duplicate the problem without the lower attached.

JonM 02-08-2014 01:00 PM

The takedown pin itself doesn't interact with the bcg in any fashion. The rear one has a detent that is held in by the a2 stock or endplate.

Sounds like the wrong buffer/spring/tube crossthreaded or tube screwed in too deep. Or combinations of those

KG7IL 02-08-2014 04:05 PM

To our OP, Firecontrol663

Again Welcome to the forum. . .. come back. help us to help you..... where are you?

We need some info on how, when this happens.

danf_fl 02-08-2014 05:30 PM

Quote:

Originally Posted by Firecontrol663 (Post 1501048)
When I pull the charging handle back with the take down pin pulled out it is very easy to rack back. When I push the take down pin in and pull the charging handle back it's very hard to pull.

Are you sure the BCG is installed correctly (not upside down)?

KG7IL 02-08-2014 06:03 PM

Quote:

Originally Posted by danf_fl (Post 1501532)
Are you sure the BCG is installed correctly (not upside down)?

I'll admit, I just tried this. Didn't think this could happen.
I still don't think this can happen. (Unless I shear off a few parts).

I understand his question to 'hinge' on the pin.
I don't think that an upside down BCG would EVER MOVE EASILY. .. .

danf_fl 02-09-2014 10:24 AM

New people have done a lot of things I never thought were possible.

sgthooah04 02-10-2014 11:49 AM

I would go with JonM. If the upper and lower are together when the pin is in I would look at the buffer assembly. I Would also look at the buffer retaining pin to see if it's too long haven't had a problem like that but I have gotten a few parts and springs that wouldn't work in different manufacturers guns.

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