This is a discussion on Storm Lake .40 to 9mm Comp. barrel tolerance issue within the MP Pistol Tech Help forums, part of the Smith & Wesson MP Forum category; I've been pining for a .40 to 9 conversion barrel for my M&P40c for a while now. Everytime I go to order one, however, it's ...
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|April 22nd, 2015, 06:11 PM||#1|
Join Date: Nov 2013
Storm Lake .40 to 9mm Comp. barrel tolerance issue
I've been pining for a .40 to 9 conversion barrel for my M&P40c for a while now. Everytime I go to order one, however, it's always out of stock. I got lucky this past weekend and managed to order the last one grabagun had (only moments after they got it back in stock). I ordered some 9mm mags from gregcotellc, and couldn't wait to tear open the package when it arrived.
I immediately stripped down my M&P, took out the factory barrel, and set about installing the Storm Lake conversion barrel.
Only one problem: it doesn't fit.
The top of the barrel doesn't quite seem to fit into the ejection port. I can't slide or force in.
I emailed them yesterday, but I haven't gotten a response back yet. I plan on trying to call them tomorrow to see what they say. On their web-page it says that their M&P barrels are "drop-in" replacements ,and only "occasionally" require gunsmithing. Has anyone had experience dealing with Storm Lake customer service? Do they replace/fix barrels barrels, or do they tell you to take it to a gunsmith? Last time I tried to buy a replacement barrel I had to send it in (S&W OEM .357sig), and they had my gun for about 9 weeks or so. I don't have much luck with aftermarket parts.
As an aside, I just happen to be a beginning engineering student, and I was curious as to what degree the barrels differed. So I pulled out my cheapo digital caliper that I use for hobby-CAD stuff, and I took 5 measurements of said dimension, averaged it and compared it with my OEM .40S&W barrel. I was rather surprised and intrigued by the result.
My caliper measures to 1 millionth of an inch, but you're only supposed trust up to 1 thousandth of an inch, so ~1.220" (Storm Lake) and ~1.213" (S&W),.... They differ only by 0.007", barely perceptible when comparing them side-by-side! When measuring the ejection port, I got an average of 1.222", Storm Lake's tolerance leaves only 0.002" of an inch of clearance (obviously not enough in my case), and Smith and Wesson leaves 0.009" of an inch in clearance. I've read that Storm Lake uses tight tolerances, and they weren't kidding.
I took multiple comparison measurements between the two barrels, and nearly every time I got the same reading on the Storm Lake barrel, but when I measured the Smith and Wesson barrel, the measurements varied sometimes significantly across the same surface, (+/-0.002"). I don't have a lot of experience machining, nor have I taken a class dealing with manufacturing tolerances, but I'm rather surprised at how much of a difference a few thousandths of an inch makes, especially in a handgun. I hear about pistol tolerances on gun forums all the time, but this is the first time I've personally seen an example of it. Go figure.
Last edited by sittinduck21; April 22nd, 2015 at 06:18 PM.
|April 22nd, 2015, 07:10 PM||#3|
Join Date: Nov 2013
I am aware of what it says. I was asking if anyone had experience dealing with their customer service, and whether they do the occasional modification or if I am responsible.
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|April 22nd, 2015, 07:22 PM||#4|
Join Date: Oct 2014
|April 23rd, 2015, 12:25 AM||#5|
Join Date: Oct 2007
Early last year, a fellow competitor purchased a KKM barrel for his current Limited Class M&P pistol build. Unfortunately, the muzzle was sticking just enough to cause some minor timing issues, but only in this one gun. With his permission I swapped his barrel for an identical barrel I had in my range bag, We're both happy campers, since he now has a barrel that works perfectly in all his pistols, and my muzzle may lock up a smidge tighter than it did before.
P.S. Yes Woodys2718, we already know how you hate it when I use such imprecise language as "minor".
|April 23rd, 2015, 08:35 PM||#6|
Join Date: Jun 2012
P.S. +1 Lol!
|March 4th, 2016, 03:31 AM||#7|
Join Date: Dec 2015
I have two Storm Lake 40 to 9mm conversion barrels for my M&P 9's. One works perfect, no problems, the other gives me failure to feed issues. I tried calling their customer service line all day Wednesday and sent them an email Wednesday as well. Sadly, no response from them.
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