I don't know about the bushmaster carbon but I built an AR about three years ago using one of the carbon fiber lower receivers and love it. It knocks about two pounds off the weight of the gun. They build airplanes out of carbon fiber so it must be strong. I have put about 5k of rounds thru my carbon ar without a hitch. All the standard parts fit the carbon receiver.
The carbons don't have the best reputation and have been slow sellers. Whether or not there is anything to the complaints I can't say, but I suspect alot of the negativity is due to it being "different" rather than any real problems. Bushmaster makes very good AR's and has very good customer service, I wouldn't worry if I were you. Even if the lower were junk you could buy a stripped lower for $125.00 or so and still be ahead.
Less machining means less cost. The carbon fiber receiver is easy to mold and finish without a lot of machining. Lots of companies are using the carbon fiber technology in their handguns and rifles. Light weight and super strong. If you have ever seen the impact tests run on metal and carbon fiber units, the metal will bend and stay bent. The carbon fiber bends but returns to it original shape. Kind of like when polymer frame pistols appeared and everyone said they wouldn't hold up.
Bushmaster came out with two different Carbon 15 rifles. The type 21 which I have and the type 97 which was a little more expensive.
I have had my Type 21 for some 10 years now. Bushmaster bought out the Professional Ordnance plant in AZ and began to manufacture the weapons under there name.
The BCG is exactly like any AR. So are most parts in the trigger group. Buffer and spring are the same also as much as I can tell. Mine has a SS bbl and a "pneumatic hose" type muzzle brake which works great. The butt stock comes off with a simple throw lever and a shorter LOP stock is/was offered(I have one).
I got mine for a close range,coyote calling,weapon. I put a small red dot sight on it and the total weight of the package is 4lbs 4ozs. It is super easy to control while swinging on running yotes.
I have about 200rds thru mine,shooting my handloads only. The 52gr SMK's with a medium charge of 748 works great in this little gun. I have had zero problems with my weapon and it is 2MOA accurate. ----- pruhdlr
EDIT to add ---> also takes AR mags
I saw one for about $650 at my local Gander Mountain. I checked it out and didn't care for it. The upper is carbon also and the bolt ride seems pretty rough. I would worry about wear on the upper if your the kind to shoot alot but I don't know for sure. If you want a light rifle this would be it, I just can't get past the carbon upper but the carbon lower doesn't bother me though. Just my thoughts. Dave
Carbon fiber is far stronger than aluminum so I really wouldn't have any concerns with strength. The only concern I would have would be if your the type of person that dumps a few hundred rounds at a time without letting the gun cool, I could see that weakining the receiver over time. If Bushmaster puts their name on it I wouldn't have any worries.
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