12-06-2011, 05:34 PM
LRRPF52 Wrote:The ITS Super Bolts for 7.62x39 and 5.56 work with standard AR barrel extensions. The 6BR bolt and barrel extension is a different animal since it uses a .473" diameter case head, like .308, but still fits in an AR15 upper.
LRR have you had any experience with Harrison's 6mm BRX? I know he was building these some time ago, but things seem to have gone quiet on the BRX recently.