New to this forum. Long time member of AR15.com; SIGForum.com and a boatload of others. Introduced to 7.62x51 in 1965, carried first tour in RVN, switched to M16A1 for second tour. Just bought a new Windham Weaponry AR10 and joined to learn all I can about them. 100% Service-Connected disability from VA. Ask away.