This is the release of the GP37.

The GP37 is a 37mm caseless launcher that can be loaded with the same payloads as commercial 37mm launchers, in a new caseless format that resembles eastern launchers for the AK series.

The GP37 uses a simple electronic ignition, and does not utilize conventional primers.

This model of GP37 mounts to a 1913 'picatinny' rail. A standalone mount resembling the RGM-40 Kastet is in progress that it will mount to.

A more traditional direct mount is also in progress, and will mount to an unmodified AKM style rifle.

The sight used on this model is an M15 grenade sight for an M1 Garand. These can be had under $30 and are similar enough to a GP sight yet easy to obtain.

A parts list and assembly writeup with picture instructions is in progress.

This model features an optional functioning ejector and safety selector.