6061 uppers?

[Tedward]

I don't see where he said worn out; only where the fit between upper and lower wore loose in his application:



You said yourself in this same thread that pin rub in a lower could result in wear:



I'm not sure why you feel that LRRPF52 must prove anything. His actual experience is in agreement with your speculation, and also with the data in links previously posted by you.

First Merry Christmas.
Nobody has to prove themselves but the topic was uppers and not the lower receivers. I am just referring to the uppers and yes I feel the billet Lowers, 7075, is better, more customizable by manufactures and that is what I was agreeing with.

As for uppers, I have not seen any wear in the take down pins on my DPMS Low Pro "Slick Sides". Now that dmsims21 stated they are not extruded form 6061, that one isn't in question then. The MI, as I stated earlier is 6061. I have a couple and would like to know if I should not use them in the future and is there is in fact reliability issues with them.

This topic started off on uppers and went into climbing components, back to 6061 receiver sets been worn loose between the tension pins. I don't even know of a lower made of 6061. MAG TECH might be and I have read of there supposed issues and will not use them or Carbon, plastic or any other composite parts. It might be ammo exploding but I want my receivers to contain the fragments in those situation. So I won't use them

Is 6061 Softer but thicker and might hold together under that situation of a catastrophic failure? If so I find that more appealing.

I have nothing to gain about my question as the topic asked, is the 6061 not reliable? I don't care about Climbing Gear, milling of softer or harder metals, just is it reliable or is there info on them failing.