It worked however the recoil was too much for long term use and good quick followup shots were almost impossible. Ditched my SBA3 brace, switched out the adjustable tube for a pistol tube, and used my cheek as the third point of contact along with the lighter buffer. Discovered "Demonstrated Concepts" and cheek pistol use on youtube. Have run a smaller 5.4 oz buffer and spacer set up for a long time in an AR9 pistol with a brace. I won't build another 9mm AR without this buffer. The difference in felt recoil with the heavier buffer slowing the bolt is stark not having to run a spacer is a nice bonus. 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 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. I picked up a Foxtrot Mike bolt to build a second 9mm AR with my son. 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. This AR15 9MM CARBINE BUFFER EXTENDED HEAVY solved all of my issues and also shrunk my 50 yard groups by orders of magnitude. Suppressed was a very harsh gas blast to face. MY 9MM AR was not very much fun and awful shooting +P+ Ammunition. 5 Makes even +P+ ammo tame and shrunk my groups.The AR-9 is a bit smoother now and less OOB worries. 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. And I also wanted a sliding weight to reduce possibility of out of battery issues. 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. Switched to this heavy buffer to slow the action down and haven't had any feed issues since. 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. Was using Ghost Firearms/Grid Defense upper with a standard 3oz buffer. I have several of these and run in most PCC's. 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. It's the buffer you need in a 9mm blowback ar if you want it to run reliably
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