The BAD KAK WW III Build

If you do any AR building, you know how it is when you have spare parts. Anything can be the impetus to do a new build. I mean, if I have a spare grip, I may as well build another rifle right? Well, this time I actually had a spare lower, so I definitely had to do something with that. Since I ended up with a Bad Attitude Department lower and a complete KAK Industry WW III upper, I’m calling this one the BAD KAK WW III build.

A Bad Attitude to Start With

I’ve ordered a number of custom lowers from Bad Attitude Department. When I got my XCOM lower for my sci-fi build I ended up getting two lowers. I got those in the raw and ended up moly coating them. I did one in FDE for the main XCOM X-9 build, and did the other in SOCOM black for some later project. I kept stumbling across the black lower in my parts bin as I was doing other work, and decided to see what I could put together.

I had a lower parts kit from B. King Firearms, a spare buffer tube that I think was a take off from a PSA lower and a KAK enhanced buffer and flat coil spring that I had been waiting to use on a project. I have a bunch of spare grips, but the cool carbon fiber fiber finish A2 Echo grip from MEAN Arms seemed like a good fit for this one. Initially I had a CAR stock on the build left over from a retro build. I swapped that out to a regular M4 stock later, since this was going to be a more modern build.

Where To Buy

The KAK WW III Upper

When it came to the upper half of the rifle, I was a little more pressed for parts. Everything I had was set up for either SBRs or pistols. Since I didn’t plan on SBR’ing or bracing this build, I started looking around for what kind of carbine configuration I wanted to do. Since I’m a fan of light and short builds, even if they aren’t SBRs, I was looking in that direction. As luck would have it, right around the time I was checking out my options, I got an email from KAK Industry with a sale on what they were calling their WW III Midlength Lightweight upper.

KAK’s WW III offerings usually have pretty good discounts, as they tend to be built from things they have an excess of stock on. That works for me, as they’re all first quality parts. So as long as there’s a configuration you like, it’s a win-win. You get a good deal, and they get to move something they have an abundance of.

Now, I generally tend to put together my own uppers. I don’t have anything against factory builds, but I like building, and can usually pick exactly what parts I want if I do it myself. I didn’t have an exact plan in mind for this build though, and the WW III checked off the boxes I was looking for.

The WW III used a KAK flattop upper with forward assist and brass deflector. It was fitted with a 5.56mm 14.5-inch government profile barrel that was a contract overrun from, you guessed it, the U.S. government. KAK had one of their new HK flash hiders pinned and welded on to bring it to 16 inches, so no worries on barrel length. Not having to take it and get it pinned and welded myself saved some cash too. KAK used a midlength gas system, which I’m a fan of. It used a 9.8-inch M-LOK KAK rail. I typically go with longer rails, but the price was right on the upper, and it was a little different than my other builds. It shaves off some weight too, which isn’t a bad thing. The sale price was just $225. I added in a KAK Bolt Carrier group and with the pin and weld option my total was $$305.

Since I was ordering the upper and bolt carrier group anyway, I added a KAK extended charging handle as well. Their Big Latch charging handles are my favorite, and I’ve used them on a fair number of builds now. They aren’t fancy, basically a GI charging handle with an extended latch, but they work for me. There’s enough of an extension to make charging easy, even with optics mounted, but not so much as to hang up on anything. It’s a clean, simple design. They’re also quite affordable at only $24, which is why I have a bunch of them.

I felt like calling this one a build was a stretch since, when my KAK parts arrived, I simply slapped the upper on my lower, popped the charging handle and BCG in, and was done. Since the WW III top half is all KAK, and the lower is from Bad Attitude Department, I’m calling it the BAD KAK WW III build.

Where To Buy

The BAD KAK WW IIII

So, for an easy build that started with some spare parts and ended with grabbing an on sale upper, I’m pretty happy with the results. The gun looks clean to my eye, and handles great. It’s light at only 5.15 pounds, about like an M1 carbine. That’s about perfect as far as I’m concerned. 

I had just gotten one of the new Swamp Fox Raider prism sights around the time of the build and decided to check it out on the KAK rifle. I wasn’t planning on running irons on this build anyway, so the prism sight is a good choice. Even if the battery dies (unlikely with a 35,000 hour runtime and a shake awake feature) and you lose the illumination, you still have the etched reticle to shoot with. Adding the Raider bumped my weight up to 6.10 pounds which was still pretty good. 

I have a ton of AR mags. GI surplus, Brownells aluminum, various generations of Magpul and a few other odds and ends. I have been working with Amend2 mags over the summer though and have had very good results with them so I snagged their translucent Mod C mag to use with the build. I know Magpul just released their T Mag, and I’ll get some to mess with eventually, but I had the Amend2 already and knew it worked. I had a couple black Mod 3 Amend2 mags as well that I set aside for use with the WW III.

Range Time

Taking the WW III to the range was uneventful, just how I like it. The KAK upper ran everything I put through it without issue. Being that I’ve used a lot of KAK parts in my previous builds, I wasn’t surprised, even though I hadn’t used one of their complete uppers before. 

The Swamp Fox Raider worked out well. I had previously tested it on an SBR and was pleased with it. The glass was clear, and the reticle showed crisply. It was quite usable even without the illumination on. With the red reticle turned on it made picking up the sight fast, and there was plenty of adjustment to make it visible even in bright sunlight. I had been shooting steel at 300 yards with the SBR and the Swamp Fox, which impressed me since I don’t do a lot of longer range shooting. I figured if it did that with a 12.5-inch barrel then it should be at least as good with KAK’s 14.5-inch tube. 

I sighted in with 62-grain Fiocchi Range Dynamics .223 loads, and used those Winchester Target & Practice 62-grain FMJ for my initial break-in and some of my typical plinking. After confirming my POA, I stepped out the 300-yard gong again with Hornady Frontier 75-grain BTHPs and PPU Matchline .223 75-grain HP BT loads. As I suspected, I was able to consistently ding the gong with little effort. I could have benched it and shot some groups, but as any of you who’ve read my other pieces probably know, I only do that when pressured by my editor. Steel and dynamic targets are much more fun.

The WW III is quick to shoulder. The light weight and compact overall length made transitioning between targets fast and smooth. It’s a pleasant rifle to shoot. Despite the lighter weight, the heavy KAK buffer and midlength gas system made it a smooth shooter. Not that 5.56mm is a thumper by any means, but some builds do shoot flatter than others. 

The Flektarn Connection

I was fairly happy with my grip and stock set up, but then I saw the limited drop of German Flektarn camo pattern stocks from B5 Systems. Since my XCOM lower had pseudo German markings I figured Flektarn would be a perfect fit. I fooled around and missed the initial drop and was kicking myself, but recently found a set from Shooters Choice in South Carolina. They even had a good price on it and pretty fast shipping. They still had some listed at least of this writing, too.

I picked up a Flektarn pattern sling from Edgar Sherman Design off of Ebay along with a surplus German HK spring clip for the front of the sling. The B5 set consisted of a Bravo stock, Type 23 grip and a vertical foregrip. B5’s stuff is always solid. It made for a unique but practical upgrade for the build.

Round Up

For a build that started off as a hodgepodge of what’s in my parts bin, the KAK-centric WW III build turned out pretty well. It’s a simple, clean carbine. The lightweight and slim profile make it handle great. Reliability was perfect, and accuracy was quite acceptable for anything I’ll be doing, which is mostly plinking. I have a couple “serious” rifles if I ever really need one, so most of my builds are just for fun, and the BAD KAK WW III definitely checks the fun box. 

Check out Ammo To Go, the ammunition retail sponsor of TTAG, for all of your ammunition needs.

Product and gun reviews are performed independently and product mentions made based on the quality of the product and value of interest to gun owners. However, when you buy through links on our site, we may earn a commission to help support the costs of operating the site and keeping it free for our visitors.