In 1990, the Heckler & Koch company working on a new form of weaponry for the macrofighter program, the earliest generation of rail-guns the P-3 railgun ( https://www.furaffinity.net/view/39423100/) being one of the earliest of the railgun sniper weapons conceived in 1991. By the mid 90's they improved the railgun with the LRS-34 (Linear-Rail-Shot) in 1997, never again will an aeromorph will have to be subjected to the Jacobs Ladder electronic projectors when firing the weapon. There was also a smaller model released in 1993 known as the PK-9 this small weapon was to test out battery cartridges on these weapons.

Here we see a F-4 Phantom unit carrying the LRSS-35 that was released in 1998, she looks like she's about to go in for the shot.