It’s the original factory spring. I’m not sure what the weight is but the 9mm CCU uses a single spring rather than the dual spring system in the 45 ACP.
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Sample of one, but a few weeks back I shot @JHC 's Sams-customized 9mm Combat Operator and encountered sporadic FTF issues throughout, usually remedied by a good whack on the back of the slide. By way of thanks, I ordered him a set of variable recoil springs from Wolff.
I know he has shot it with both the 13# and 14# springs with good results. Perhaps he will share his experience.
I do not know what weight Colt uses but it is something to consider.
ETA: I believe ToddG settled on a 14# variable to get his 9mm 1911 to function reliably.
https://www.gunsprings.com/COLT/1911...cID1/mID1/dID1
According to Wolff’s Website, Colt uses a 14lb spring in 9mm and 38Super. It was not listed in the manual. I may play with the weight a little or try some 124 grain +P GDHPs to see if I can get her running. Thanks for the suggestion.
I was mistaken in my earlier post - it is the dual recoil spring assembly in the gun. Specifically, it’s a dual spring with a red painted base. The rounds appear to be hitting the feed ramp and the malfunction is as Kevin B described - a swift tap to the back of the slide chambers the round:
Attachment 21725
I’m ordering a Wolff variety pack to see if that helps.
No idea how I missed this thread from one of my favorite members of the community. Going to read the whole thing.
I started at the top of the scale. The 14# and 13# ran pretty well but stifled the ejection down to the range of 10-20 INCHES of total distance to my right. I did get about 2 FTE per 100 rounds fired with each.
Now I'm a couple outings out - 275 rounds total with the 11#. That looks pretty nice so far. Ejection distance is about 6-7 feet to my right which seems reasonable.
Friday (first time out with the 11# near the end of 175 rounds total, I ran into 4 FTF/FTE one right after another with my magazine #5. I was almost out of ammo but no issues with two other mags for the remaining 20 or so. But too little to be conclusive.
This morning I started with suspect magazine number 5 and got a FTF on the first shot. I set it aside and shot the rest of the 100 with the other mags with no further issues. So the 11# is feeling pretty good so far.
For a frame of reference, I asked SA customer service what weight the OEM spring was for the 5" 9mm and they told me its 9#.
Considering that both my .40 2011's run fantastically with 12lb springs and 180 pf ammo, a 14lb spring strikes me as pretty heavy for a 5' 9mm