Thanks Jim,
Measure with calipers from the base to the top, They are close. Look close too.
Here's a couple pics. It's either 6000 or 0009, the other number is 42 on another lobe.
No other markings.
According to DD's web site, Mega Cycle has 1/4 x 28 thread on the AA thread. This has 1/4 x 26.
It's probably stock or close to it. Reasonably sure it's not a Combat.