KKM 40 to 9 conversion barrel review - MP-Pistol Forum

KKM 40 to 9 conversion barrel review

This is a discussion on KKM 40 to 9 conversion barrel review within the MP Range Reports forums, part of the Smith & Wesson MP Forum category; I just got a 40 to 9mm 5" barrel conversion for my M&P's. I have 3 5" barreled M&P 40 models so it made sense ...


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Old September 11th, 2016, 10:31 AM   #1
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KKM 40 to 9 conversion barrel review

I just got a 40 to 9mm 5" barrel conversion for my M&P's. I have 3 5" barreled M&P 40 models so it made sense to get this. I ordered the black nitrided version to maintain a more stock look, and it arrived about 3 weeks after I ordered it directly from the kkm website. My M&P 40's are old enough to still have blue recoil springs.





I used remingtnton UMC 115gr FMJ to test it out. First I wanted to see if it would group or significantly change my POI so I set up two B-6 targets at 25 yards and was pleased with the results. I brought up my point of aim a few inches for the second group and all the rounds landed in the black.



Pretty solid 3" groups. More accurate than the factory .40 barrels by 20% or so, at least with me pulling the trigger. I'm sure with an optic or an expert shooter this barrel could give you all the accuracy you need.

Having limited patience for shooting tiny groups at 25 yards, I moved the target to 10 yards and did some drills. I mostly wanted to test the reliability of the barrel and proceeded to blaze through the 250 round Remington UMC bulk pack. I was expecting a few malfunctions at first as the new barrel was broken in, and was pleased that I only had 1 stovepipe about midway through the second magazine, about the 25th round through the pistol. After that it chewed through the rest of the 250 round bulk pack without a hiccup.

I will probably run a few hundred defensive hollow points through the barrel when I can to further test reliability, but so far so good. Overall I'm pretty pleased, the 9mm barrel will be a nice thing to have on hand if for some reason 9mm is all I can find, or in a budget crunch if I need to save money on ammo.

The ejection was noticeably weaker than with .40 S&W ammo. Empty brass landed about a foot to my right instead of 2-3 feet. Still, only the one stovepipe and +p type defensive ammo would probably eject a little more authoritatively. I'll also throw this one in my CORE with the RMR next range trip and get a better accuracy result. Thumbs up, the KKM barrel seems like a good buy.

Last edited by LoneStarWings; September 11th, 2016 at 03:30 PM.
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Old September 11th, 2016, 02:12 PM   #2
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I put it in one of my other .40 pro's, this time the CORE with a Trijicon RMR07 and shot it for accuracy. After 10 five shot groups, I averaged 3.9" at 25 yards, still with the 115 gr Remington UMC. I fired 150 rounds all in all with the KKM 40-9 barrel through the 40 CORE with no malfunctions. Groups tended to expand toward the end of the testing, probably due to barrel heating and shooter fatigue. The ejection pattern was similar to the previous pistol. POI was about 2" high and right vs 180gr .40 S&W.

Here are the 3 best groups:



Top pistol here used:


Last edited by LoneStarWings; September 11th, 2016 at 02:18 PM.
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Old September 11th, 2016, 04:27 PM   #3
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Great review! Thanks!
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