Originally Posted by gadrooning
Cane did I read your post right? You put in a 14# spring in the Fenrir???? I run a 20# spring in mine and have no problem, but I always assumed that running anything lower would damage the gun, so I have never tried. Is the 14# a permanent fix for fenrir. No issues?
be sure you have the CCG HD firing pin spring installed! That's a whole other issue that MUST be correct with the installation of the CCG kit. Ask me and I will address that issue later.
Is your donor gun stainless steel? Is it a Colt? It seams the Colt tight fit, and the increased coefficient of friction of the Colt SS alloy (which is designed for the 45 ACP pressures) causes issues with timing when cycling the 460 Rowland.
I worked with Clark to fix my FTE issue by starting with an inspection of the extractor, no problem. Then moved to the ejector and found no witness mark of contact on the brass. This simply means the slide is not cycling totally to the rear, contacting the ejector and kicking the spent cartridge out. No full slide travel = too much resistance.
I then preformed the slide to receiver lapping. (220/320/600) This took some time and effort but produced an incredibly smooth slide cycle. This improvement did not completely eliminate the FTE. The ejector witness marks were light if evident so the next step was to step down the recoil spring pressure.
I went from 24# to 22#, then 18.5# and when I got down to the stock 16# I was told by Clark that they can't recommend I go any lower. (wink, wink - CYA) I was seeing fewer FTEs but was not satisfied with Fenrir as a dependable PD weapon. My next step was to use a 14# ISMI Chrome Silicon Recoil Spring which is typically the spring used with the 38 super and 9mm 1911s.
Presto! Fenrir has run flawless after this last change. When gorknoids was down we ran ~50 rounds through her sans incident!
So to answer your question, yes the 14# spring is my fix for now. I think if it wears in some more I will try to go back up to 16# just to slow the wear. As of right now, with ~100 rounds through her with the light spring I see no accelerated wear. I do keep a close watch on this.
IF YOUR SET-UP RUNS WITH THE 20# SPRING, DO NOT
If it runs, don't touch it!