Tag Archives: MK18

M4 Restoration & Conversion

My King Arms Colt M4 has been one of my most trusted AEG primaries over the past three years. Over it’s life I’ve given it different paint jobs with different patterns,  I’ve tossed a variety of internals and external parts on it as needed but sometimes you need to reevaluate an AEGs purpose in your inventory and either refit it or sell it.

Hit the link to see how I gave an old gun new life.
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New PTW Upper

Well… sort of. Two “new” uppers – the lower 14.5″ was just a simple swap of barrel nut, rail, and gas block from my other guns. The MK18 Mod 1 style upper (pictured above) is the one that I’d like to show off today (post field test in the snow, hence some rust that wasn’t quite cleaned off entirely yet).


I intended to build this upper with a couple of goals in mind – one of which was weight savings (hence the shorter barrel). The easiest way to shave significant weight from a PTW upper is to get a lighter, aluminum Dytac outer barrel. I’ve got a couple of notes on this barrel that I’ve either learned from The Reptile House blog or through observation of the fit with the other parts in this build. As much as some of you (“Jetlag”) may make fun of me for trying to make a lighter gun, I’m kinda lazy when it comes to slinging around a gun that’s heavier than it needs to be.

As I had a pretty specific look and feel in mind, it did result in some different parts choices – including Prime upper receiver, Madbull MK18 rail, Dytac 10.5 barrel. Internal parts were chosen mainly for testing purposes (hopefully for the better) – FCC Advance Gen 2 hop chamber, MAG Curve Roller (already tested), Orga 6.13 barrel. I’ll discuss these parts further, after the break.

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