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The Bolters used by Space Marines in Warhammer 40000 table-top combat game is an iconic weapon is the science fiction world. In this scifi universe, the Space Marines are parallel to the U.S. Marine. And the Bolter is their equivalent to a M4 assault rifle.
Just today, when I was looking at M4 pistols, it occurred to me how the M4 pistol (without a buffer tube) resembled a Bolter. That gave me a sudden inspiration to design an airsoft Bolter using the M4 as the base.
In this article, I will walk through the process of building a functional airsoft Warhammer 40K Bolter through the use of off-the-shelf M4 parts.
To test the feasibility and perform a rapid prototype, I used the Pimp My Gun site (see "Related Links" section below). Pimp My Gun allows you to assemble guns virtually using a selection of models. I used its list of standard M4 parts to assemble the base of the airsoft Bolter. The result is shown in the design below.
Pimp My Gun has the short grenade launcher above, but it's too long for our purpose. There is a mini M203 airsoft grenade launcher now, which should be sufficient for this purpose. So using Gimp, I made some changes to resemble real airsoft parts. The result is shown below.