I looked at your Data sheet and now see it's partially threaded.
I'd keep the screw, but would install a X marked on top screw, or a XX. Which some say is actually a + mark instead of a x.
CH-P777
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USGI,
I just looked over my 2 WRA spring tubes, both have no X. But look exactly like SSR's screw head, with that inner circular look about the slot.
My 5,5 and 5,8 WRA's both have X marked screw heads.
All are Partial threaded.
My suggestion of a X screw for SSR's WRA is bad advice.
I'll PM him.
Thx bob
CH-P777
Thank you Charlie. I was afraid I paid a little too much. My Max bid was $150 less than I paid for it, but then I thought, "are you really going to let it go over a measly $150. I've been looking for one for a long time, I guess it having the NRA paperwork with it made me pay more.