This is a tri rail mount for the outer barrel of a Tokyo Marui AA12. Made on request for Thingiverse user M82Massacre. This has a front flat so you can easily print
...Zeig mehr it with no supports. You will require two M4 nuts, and 2 M4 machine screws of approximately 45mm in length (including the head).
There is the original shorter version here: https://www.thingiverse.com/thing:2456475