Thank you for setting it straight Bill, and I will concede the finer points of production contracts, and maybe even issuance standards by the military, but two of my five brothers that served, Tommy and Terry, have both used the stabilizer on their M14's that were FA, on duty, not M14A1's ( E2 ). Tommy even procurred himself an M2 bipod, which was not issued to him. He stated that he rarely used it though. They both remarked when asked about it, that the jamb nut ( or lock nut ) on the stabilizer would continually loosen under fire, even when gorilla tight. Have you ever heard of this from anyone else that used it regularly ?.......They also both remarked that the unit did a fair job of taming, during firing.