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Dang, I knew the answers you would get on this forum as soon as I read the post. This is the most Bushmaster centric forum I've ever seen. Be different, get the DPMS. B^)
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The sad thing is that you appear to believe that people are recommending Bushmaster out of "brand loyalty". That isn't the case, though, at least from most of the guys that have been involved with ARs for a long time.
Instead, the reason Bushmaster is recommended above others is because Bushmaster rifles are as close as possible to Mil-Spec. Certainly, other companies make components that Mil-Spec (within the limitations of NFA/AW laws), but Bushmaster is the one company that will give you the closest complete rifle.
Having said that, I'd have no problems buying individual parts from other vendors if I was building a rifle myself. The CMMG barrels are fine (except for the cast FSB), as are Colt barrels, and the forged receivers from most AR companies are also fine. But you can get the whole package from Bushmaster, with a warranty and customer service to back it up. That's hard to beat.
If one of the other AR companies began making their components to the same specs, we would recommend them just as much. And if Bushmaster stopped meeting the specs, we would stop recommending them.
But, I know some folks HAVE to go their own way. May your life be interesting.
-Troy