A weaponstore was a place where weapons were kept. (PROSE: The Book of the War, TV: The Timeless Children)
After breaking away from Faction Paradox, the various Remote weaponstores grew to the point that, if united, they could have made a serious claim to being a Great House. However, the majority of these weapons went unused, as they simply didn't fit with the weaponry symbolism that the typical Remote was primed to listen to. (PROSE: The Book of the War)
Ko Sharmus kept a weaponstore on the Planet of the Boundary. He offered its explosives and a large bomb to Ryan Sinclair and Ethan. (TV: The Timeless Children)