Miniature M4 carbine with M203 grenade launcher. 2:32 video:
https://www.youtube.com/watch?v=GhsHYHM05Ck
Previously:
https://www.homemadetools.net/forum/...268#post176957
https://www.homemadetools.net/forum/...240#post172780
https://www.homemadetools.net/forum/...755#post163542
https://www.homemadetools.net/forum/...873#post160025
https://www.homemadetools.net/forum/...528#post122933
