KAK Industry AR15 9MM Carbine Buffer Extended, Heavy 10 oz

My colt RO639 came with a 3.75 inch 5.4 ounce buffer. With 9 mm NATO, it flung brass to the other side of the range. Ejection was violent. With the addition of the 10 ounce heavy buffer, my brass winds up in a neat little pile 8 feet to the front right of me. Absolutely the best thing for my gun.

the 10 ounce worked really well in my jagger aut tactical ar pistol, along with a kaw valley .308 spring, perfect combo

It's the buffer you need in a 9mm blowback ar if you want it to run reliably

Weighed mine when it arrived and it is 9.8 oz on my scale, which is good, because on a 9mm blowback heavy is good. Shoots flawlessly and smoothly.

one of the best PCC buffers available. I have several of these and run in most PCC's.

Was using Ghost Firearms/Grid Defense upper with a standard 3oz buffer. The Ghost barrel does have an improved feed cone but I was still getting about 1 in 4 rounds that wouldn't feed and would get caught sideways in the action. Switched to this heavy buffer to slow the action down and haven't had any feed issues since.

I had a 7.5oz non-sliding weight buffer in my 16" barrel AR-9 - wasn't as smooth as it should be with my bolt. And I also wanted a sliding weight to reduce possibility of out of battery issues. I got this KAK heavy buffer and swapped one of the tungsten weights out for a steel to reach a combined bolt-buffer weight of 23 oz, which I think is just about ideal. The AR-9 is a bit smoother now and less OOB worries.

MY 9MM AR was not very much fun and awful shooting +P+ Ammunition. Suppressed was a very harsh gas blast to face. This AR15 9MM CARBINE BUFFER EXTENDED HEAVY solved all of my issues and also shrunk my 50 yard groups by orders of magnitude. Thanks!

I was running a Stern Defense bolt (13.77 oz) with a standard length H3 buffer & spacer (totaling about 18 oz); it worked reliably, but I was getting quite a bit of felt recoil with the buffer slamming into the spacer. I picked up a Foxtrot Mike bolt to build a second 9mm AR with my son. The FM bolt weighs only 12.5 oz, so I started looking for heavier buffers over concerns that the FM bolt/H3 combo would be too light. Found this buffer and purchased two; swapping out a couple of tungsten buffers for steel on one of them, we were able to get both bolt/buffer combos to about 22.5 oz. The difference in felt recoil with the heavier buffer slowing the bolt is stark; not having to run a spacer is a nice bonus. I won't build another 9mm AR without this buffer.