Yes, the astronauts placed reflectors on the moon that could be used by a laser rangefinder to calculate the distance from the earth to the moon with unprecedented accuracy…but what makes you think that it could possibly be used as a weapon?
As all space flight equipment is, at best, state of the art when it is designed, usually several years before it flies, the most likely choice of weapon on AS-11 would have been:
That was a special case. They had already taken delivery of the Lunar Module when they realized that it didn’t have a rear window to mount a gun rack in…
The chemicals in gunpowder (potassium nitrate in black powder) provide the oxygen needed for the reaction in the bullets/shells. So a gun firing in a hard vacuum isn’t a problem. And after that, the bullet would fly truer since there wouldn’t be any effects from air resistance.
Stephen Ambrose, in his book Undaunted Courage, pointed out that Lewis and Clark knew less about the region to which they were traveling than did the Apollo astronauts about the Moon. (President Jefferson gave completely straight-faced orders that Lewis and Clark investigate claims of woolly mammoth sightings on their way to the Pacific, for instance). So NASA knew the astronauts wouldn’t need no steenkin’ guns.
The space shuttle also has 3 hardpoints where heavy bolters can be fitted for 12 points each, or 1-3 heavy flamers if you get it from the Deathwatch army list. It works really well with the Blessing of the Machine Spirit equipment card.
Nope. Hortas bore tunnels underground, so they wouldn’t be detected easily from the lunar surface. Besides, as long as you leave their eggs alone, they won’t bother you.