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Old 01-22-2013, 05:55   #1
Join Date: Nov 2012
Posts: 94
Anyone tried a Lone Wolf or KKM 40sw Barrel in the Gen 4 G20?

Just ordered a new Gen 4 G20 yesterday and I'm already excited to shoot it. Looking around it seems like the 40 S&W conversion barrel will save me some ammo costs when I take this to the range.

BUT after watching the videos on the top of this page where weaker 10mm rounds caused problems for the glock employee, I'm wondering if I will need to install a different recoil spring or if the gen 4 G20 is just built for hotter rounds than the gen 3 was.

Any insight?

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wvtarheel is offline   Reply With Quote
Old 01-22-2013, 07:10   #2
Senior Member
Join Date: Aug 2011
Location: Charleston,SC
Posts: 1,021
The .40 barrel is a good idea. I wouldn't touch anything on that G4 until you have put some Underwood through it and inspected the brass. It should run fine the way it is.
JimIsland is offline   Reply With Quote
Old 01-22-2013, 12:09   #3
Join Date: Mar 2012
Posts: 31
With the stock gen 4 barrel and 10.3gr of Blue dot behind a 180gr xtp I get very little bulging, barely visible.
edhead35 is offline   Reply With Quote
Old 01-22-2013, 23:57   #4
Join Date: Sep 2011
Posts: 41
I know you're asking about operation, but, I called KKM prior to ordering this barrel and asked about it working/fitting correctly in a Gen4 G20, and the guy I talked to said there should be no problems, their barrel was made to work in there w/o any type of Gen4 redesign.
chucky2 is offline   Reply With Quote
Old 01-23-2013, 01:55   #5
Join Date: Jul 2010
Posts: 50
Or you could save up a few extra bucks and get a turret press. Then save a ton more on ammo. 10mm costs just as much as a .40 to reload (except the brass).
ryangt is offline   Reply With Quote
Old 01-29-2013, 22:02   #6
Senior Member
Join Date: Jan 2010
Location: outside Atlanta, GA.
Posts: 462
I have had my Gen 4 20 since it hit the market back in the summer. Got it at Ed's Public Safety.
Great gun, have it with 6" 10mm KKM barrel since I shoot my handloads. Works flawlessly. No bulges or smileys even with the hottest handloads.

Congrats, you'll love the Gen 4 20!
21Glock is offline   Reply With Quote


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