Annihilator
Emissary
Here is a very interesting article on NASA’s Guns....very good read
www.americanrifleman.org
An Official Journal Of The NRA | The Guns Of NASA: WSTF's Hypervelocity Impact Testing Program
To test the materials used in space flight against high-velocity impacts, the Hypervelocity Impact Testing Program uses unique firearms that produce ballistic results far beyond any conventional rifle.