Does anyone know if using a Bushmaster carbon upper requires the use of other Bushmaster proprietary hardware? Some folks on this forum have stated that this is the case, and some have stated the opposite. Perhaps Bushmaster made a blueprint change at some point so some of their uppers do require special parts, and some don’t…? The Bushmaster website seems to indicate that special parts are required.
All I can say is that the stripped Carbon-15 Upper that I bought assembled perfectly with a standard barrel and barrel nut. I also run a standard BCG and charging handle. YMMV
+1 to this.
As far as I’ve seen, and I’ve fixed a few of these, the upper receiver is completely compatable with all AR-15 parts and tools.
I have seen a few of these run just fine over a 3gun course; the design concept is workable.
And for extreme weight reduction, nothing beats polymer.
HOWEVER, consider this: any optic or sight you mount will be mounted to PLASTIC (or polymer - take you pic). That material does not have the same characteristics of Aluminum.
Furthermore, it expands/contracts under temperature changes differently than Al.
For ultimate weight reduction, would I use it? Maybe. But I would not expect tack-driving accuracy and I would expect greater POI change over a given temerature range.
I DO own a polyer upper though it has a cheap dot sight mounted & I don’t fire it over 50 yards.
Interesting.
I have a 1-4 mounted on a Carbon-15 and there isn’t a noticeable difference in POI under different temperatures. With the original 1:9 barrel (w/55gr vmax) it held about 1.5" at 100 all day all year.
I have a 1:8 SS barrel on it now and again, no difference that I’ve noticed.
Maybe I’ll put a 3-12 on it and test it out.
“yay… a new project!”
Rates of thermal expansion for polymers, plastics and carbon fiber are far less than aluminum, or any steels.
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I’m no engineer, but this is what I have always heard. I’ve been wanting to give a Carbon 15 a try.