Grenade launcher with modular interface

A grenade launcher system, comprising:

• a grenade launcher receiver;
• a grenade launcher barrel attached to the grenade launcher receiver;
• and
• a trigger assembly attached to the grenade launcher receiver at a position adjacent the grenade launcher barrel;
• the grenade launcher receiver having an elongate channel disposed on an upper surface of the grenade launcher receiver, the elongate channel extending parallel to the grenade launcher barrel and configured to slidably and removably receive a mounting rail;
• a grenade launcher stock assembly, the grenade launcher stock assembly including a stock rail and a shoulder support;
• the stock rail having a first end and a second end opposite the first end, the first end configured to be slidably received within the elongate channel, wherein the shoulder support is attached to the second end;
• at least one toggle clamp for selectively locking and unlocking the stock rail, wherein a position of the stock rail within the elongate channel is slidably adjustable when the at least one toggle clamp is unlocked and wherein the position of the stock rail is fixed when the at least one toggle clamp is locked.