Please identify 1969 period rifle grenade set

[breakeyp]

This showed up at a small show today. It is complete in a capped cardboard tube marked, "PRAC (INT-F) / RFL -- 40 / N / AA? 69.

The grenade body has the same markings as the shipping/carrying tube. With the grenade is a plastic packaged blank / launching round and an odd plastic sight marked 100, 150 and 200 yards. The sight has a circular cross section notch that must fit the rifle some how.

Is the N marking indicated Naval issue? I take the 69 to be a year date.

What does the sight fit? M16 or SA80 rifles? Where does it fit?

Is the grenade anti tank, anti personnel or ? Thank you.

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