https://www.google.com/search?q=Castlewood+Treatment+Center&rlz=1C1CHBF_enUS774US774&oq=Castlewood+Treatment+Center&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8#lrd=0x87d8d68ab4c96631:0x31766babb95012fd,1,,,
https://www.google.com/search?q=Castlewood+Treatment+Center&rlz=1C1CHBF_enUS774US774&oq=Castlewood+Treatment+Center&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8#lrd=0x87d8d68ab4c96631:0x31766babb95012fd,1,,,
Too short, probably an m4