The Bushmaster Carbon 15 M4 Carbine is a unique hybrid of traditional AR15 design and space age Carbon 15 materials. The upper and lower receivers of the C15M4 Type are molded of Carbon 15 composite which offers a weight savings of 3/4 of a pound compared to the standard forged aluminum receivers.
They say it's stronger than aluminum tho.
67 posted on 03/11/2012 8:09:55 PM PDT by smokingfrog
( sleep with one eye open (<o> ---)