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12/6/2019 7:27:02 PM
Posted: 9/29/2011 5:26:46 PM EST
I lost the rear takedown pin from my Colt AR15A3 16" carbine. I got a replacement, together with the detent and spring. However, I can see no place in the receiver to put the spring & detent. The replacement rear pin has the groove with a divot out of each end for the detent to pop into.

If it helps, the takedown pins appear to be the same diameter, but the front pin is a sex nut or sex screw while the rear pin is one piece.

I would very much like to sort this out quickly.

Thanks.
Link Posted: 9/29/2011 5:28:45 PM EST
Originally Posted By FLAL1A:
I lost the rear takedown pin from my Colt AR15A3 16" carbine. I got a replacement, together with the detent and spring. However, I can see no place in the receiver to put the spring & detent. The replacement rear pin has the groove with a divot out of each end for the detent to pop into.

If it helps, the takedown pins appear to be the same diameter, but the front pin is a sex nut or sex screw while the rear pin is one piece.

I would very much like to sort this out quickly.

Thanks.


The cut for the detent and spring is in the rear of the receiver under the stock. You need to remove the stock to get to the spring and detent.
Link Posted: 9/29/2011 5:36:10 PM EST
The gentleman from illannoys is correct. Minor surgery to get to the rear detent.
Link Posted: 9/29/2011 5:39:41 PM EST
So the stock & buffer tube both need to come off?
Link Posted: 9/29/2011 5:40:10 PM EST
Go to the Build It Yourself threads in the tech forums for pictures.

This place has more than GD, believe it or not.
Link Posted: 9/29/2011 5:41:28 PM EST
Originally Posted By FLAL1A:
So the stock & buffer tube both need to come off?


Yup. The receiver end plate is what is holding pressure on the other side of the spring for the rear detent. Have fun not crunching the spring when installing the buffer tube and endplate back on.
Link Posted: 9/29/2011 5:42:34 PM EST
Originally Posted By FLAL1A:
So the stock & buffer tube both need to come off?


For a carbine stock, you need to remove the castle nut and plate that sits at the rear of the receiver. For a rifle stock the buffer tube stays in the receiver and you just remove the stock.

Link Posted: 9/29/2011 5:44:44 PM EST
those darn sex screws remove your stock, insert detent spring and takedown pin.
Link Posted: 9/29/2011 5:46:42 PM EST
Join date, post count...wait, wat?




Link Posted: 9/29/2011 6:00:32 PM EST
I wasnna know how you lost the takedown pin without first removing the detent and spring,,,
Link Posted: 9/29/2011 6:08:02 PM EST
Originally Posted By Milo5:
I wasnna know how you lost the takedown pin without first removing the detent and spring,,,


Oh, I didn't see that first bit.

I'm gunna need pics.
Link Posted: 9/30/2011 4:56:17 AM EST
Originally Posted By Milo5:
I wasnna know how you lost the takedown pin without first removing the detent and spring,,,


This is a mystery that ranks with the whereabouts of Judge Crater. I can only tell you that I did it, just as when people begin to stammer when they see me and my wife together I say "She did in fact marry me. Beyond that, I have no evidence which would resolve your confusion or dispel your unbelief."
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