Sorry, exactly the same case measurments. The M16A1 I started out with back then used a M193 55gr bullet, same as used in Vietnam. When the M16A2 came along had a much faster twist in the barrrel and stabilized the heaver bullet 62 grain bullet. This was adopted about 1980 or so. The change to the heavier bullet started 40 years ago. NATO called it the SS109 and the US Army called it the M855. You could feed the M16A1 the M855 but it was not accurate. No problems using the M193 in a M16A2. If the new round had a larger case it would not have chambered in the older rifles, and it does. In the spring of 2010 the M855A1 was adopted by the US Army. The Marines couldn't wait and earlier did something different.
For about 20 years I shot a AR 15 in CMP High Power Service Rifle competations. I know the rifle and its history well.
Also, I am sure the US dosen't release any surplus ammo on the civilian market anymore. Everything has to be demilled. The stuff advertised as surplus is either from foreign sources or some manufactures over run.
So you did REFORGER. That was a great time to be living in Germany, 3 and 1/2 marks to the dollar.
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