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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 8/14/2005 7:53:33 PM EDT
I have a lower receiver that must be a bit out of spec as none of my other uppers will fit on it. The gun's own upper has the takedown pin hole elongated to let the takedown pin go in. Does this elongated hole affect the strength or service life of this upper receiver? It was elongated after anodizing and is raw aluminum. While I am on this subject where exactly are the recoil forces absorbed on an AR-15 type rifle?
Link Posted: 8/14/2005 7:57:33 PM EDT
May I ask who manufactures the lower?
Link Posted: 8/14/2005 8:55:30 PM EDT

Originally Posted By theshootersden:
May I ask who manufactures the lower?


And can you post pics?

Link Posted: 8/14/2005 9:36:45 PM EDT
Link Posted: 8/15/2005 2:13:36 AM EDT
Don't know about your uppers, but EVERY upper I've ever seen has an elongated rear mounting hole. Colt, Bushmaster, Rock River, etc,etc. It's standard; to allow for minor variations in lower dimentions.

Now I suppose the piece that fits your lower might have a more elongated hole than standard, and that the lower is, indeed, out of spec. Without pics, we have no way of knowing.
Link Posted: 8/15/2005 6:28:35 AM EDT
The lower receiver is a very old D.P.M.S. Becker, MN with the vertical SAFE marking. I can't figure out how to post pics. All of my uppers do have the elongated hole; but the only one that fits the D.P.M.S. has a bigger elongation. Is this lower the cast version? It looks like the one in the rollmark post and it says cast. I assume they mean the receiver is cast and not forged?
Link Posted: 8/15/2005 7:44:22 AM EDT
If you would like me to post the pics, send them to m1903@localnet.com...
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