Quote:
Originally Posted by jsha22lr
----An aluminum upper would greatly increase accuracy. My hypothesis is that as the barrel heats up, the polymer threads will begin to distort and shrink or become misformed. Metal threads wouldn't be as easy to damage or heat up.
Wolverine, that is exactly what I was thinking talking about. By stiffening the whole receiver there is less flex in it. Now doubt that with optics there is a slight amount of flexing when you tighten on rings and sights and what not near the back. Thats why the ar target rifles are mostly heavy. The more metal there is to stiffen the whole thing the better right?
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Afternoon jsha22lr
Actually the barrel does have metal threads & a metal nut to hold it in place (no threads in the plastic) . There is also a metal collar molded into the front of the plastic receiver that the barrel passes through then bolts securely into. Problem is that metal collar has no support other than the wimpy plastic around it.
Now if that metal collar could extend rearward along each side of the upper receiver & extend down into the front hinge pin area then also extend up to become molded into the upper scope rail that would allow a much more robust & much less compliant upper receiver. At least if it still did allow a bit of barrel displacement the scope rail should move with it so the scope follows the barrel & retains scope alignment to barrel bore.