OE-SPEC- 300 Blackout 10.5" Pistol Gas AR15 Barrel- Nitride

The quality of these barrels for the price is amazing. I'm replacing a 10.5" 5.56 barrel on an AR pistol, but unfortunately stuck waiting on some barrel nut shims which should be here tomorrow. Finish is very nice on these. Well worth the money.

I left the previous review and promised to get back when I'd tested the barrel for accuracy. I test how I use. With a 1x reflex red dot sight I easily achieved 1.5-2 MOA all the way to 500m. Surprisingly easy to hit 18x24 steel plates offhand at 200,300, 500m. Back to the gas port size. Someone suggested to just use an adjustable gas block. That's certainly an option. But an expensive option in a load known for being able to shoot super to sub both suppressed and unsuppressed without an adjustable gad block. And there's more: You don't need a .125 port to shoot subs without a suppressor. A .090 will easily do that in a 10.5" barrel. The extra .030 puts a lot more gas in the system causing the BCG to move much more violently which will reduce life of the patrts. The extra gas will also cause you to move off your point of aim that much more.. say you're sighted in on a 3x5 card at 100m. A properly gassed .300 blk will ensure your red dot doesn't move off that 3x5 card during cycling. With .030 worth of extra gas you're going to move off that card and past it an extra 15-20 inches depending on the qualify if your hold. It's just too much gas. You can compensate by upping the buffer weight to an H3/H4 and extra strength recoil springs.. it's all a trade-off. I don't regret getting this barrel, but you should realize what you're getting..

This barrel is amazing. I am not going to say anything else that has been stated before. But, this is response to the person who complained about the gas port size...get an adjustable gas block. Problem solved if you feel the gas port is too big. The gas port at that size allows one to shoot subsonic without a suppressor.

Looking at the specs on paper, 1/8, Melonite coated, 41V50, M4 feedramps, Pistol Gas.. all positives. Barrels with these positives normally are in the $300 range. The gas port size wasn't listed and to be fair with .300 Blackout they often don't. So I emailed KAK and within hours they got back to me (their response time is always great) saying the gas port size was .125! .125. I was surprised. If you've built many pistol gas size 10.5" .300blk weapons you'll know that's really big. I actually prefer to buy with the gas port undersized and increase the port size by .001-.002 until my weapon is optimized with the loads I prefer. I prefer that my weapon shoots 150g FMJ's at roughly 2400fps (from a 10.5) and 220g at 950fps (from a 10.5), both suppressed and not suppressed. Any combination, any load, a well optimized .300Blk can do it all while maintaining a soft shooting weapon. I've built only 5 other 10.5" .300blks, and optimized them all. The largest gas port needed was .095 and that was using an H2 buffer and regular carbine spring. .125 is a full .030 more which is a lot. It's a barnyard. Especially in a weapon where .002-.003 is a buffer weight.. It seems lately many barrel makers and I could name some popular well regarded uppers, where they come over gassed. They do this to enjoy the weapon cycles and they don't get "drop in' buyers complaining. I don't blame them, but I wish I had a choice. Two very well regarded uppers are running H3 buffers and I'm waiting on extra power springs hoping they can be optimized. And this is with low powered .223 only pushing 2750fps from a 16".. Another area that some might find a negative is having no dimples to align the gas block with. Barrels most commonly have the front dimple which allows indexing most major brands of gas blocks. I had a BRD dimple jig for BCM gas blocks, but I had ordered a KAK gas block this time, and thankfully while not the same OD the ID and spacing was the same so I was able to easily add dimples and drill and pin the block. I decided to go for the build knowing the gas port was so large. I still have a lot to learn about .300 Blk so maybe I'll be surprised. The rifle is currently built and waiting to be tested. I have a set of buffers going from Carbine weight through H4's and four different spring weights. And 4 different loads. I'll get it optimized if it can be. Who wouldn't wait a $250-$300 barrel for $100? That, and for the education, is why I'm taking the chance. No matter what I'll end up with a gun that can cycle any common load reliably. The risk is that I wont be able to optimize the combination the weapon will have more felt recoil than desired, and will come off target more than if optimized. We'll see. I'll update this one way or the other.

Recently saw a post on Facebook about a large company backing out of their order for these barrels and decided to jump on the deal! I'm glad I did. Currently building my first SBR and finding a barrel for less than $200 was near impossible. Upon doing much research about KAK, I decided to dive in! I received shipping notification within a few hours and the barrel was to my house undamaged within three days. It was a pleasure doing business with KAK and I will be ordering more parts from them in the future as well as recommending them to other gun enthusiasts.