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Old September 28, 2001, 06:45 PM   #1
slickpuppy
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Join Date: August 29, 1999
Posts: 928
SIG P Series - Reduced Power Mainsprings - Results

Well,
I know some of you have been interested in what installing reduced power mainsprings in the Sig P Series pistols will do for you. Thanks to all who helped me get this puppy out and in. The first time is always painful

First off, it was a Sig P228 that the installation was performed on. It has the newer plastic mainspring seat and therefore uses the shorter mainsprings from Wolff Gunsprings. The factory spring weight with the new style mainspring seat is rated at 21 pounds. For those of you with the metal mainspring seat it should be 24 pounds.

From the factory, the trigger pull in double action is rated at 10 pounds. Single action pull is rated at 4.5 pounds.

I installed an 18 pound mainspring into the pistol and achieved a double action pull of 7.5 pounds and a single action pull of 3.75 pounds. This was an average of 10 trigger releases with my "wonderful" RCBS Premium Trigger Pull Gauge.

Next, I took it over to the range and popped off some 50 rounds of Winchester white box target/range grade ammo - the cheapy Walmart 100 round bulk pack stuff. I had no misfires at all or other failures.

Later this weekend I will test with some Winchester NATO stuff that probably has harder primers and put a few hundred rounds more through the gun.

I was really impressed with the reduction in pull weight the reduced power springs provided. I have installed them in other guns with similar results, but the ridiculously heavy double action pull warranted some tinkering.
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Old September 29, 2001, 05:32 PM   #2
JNewell
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Join Date: March 12, 2000
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Be careful. I've read reports from people doing the same thing with Berettas that the mainspring needs to be replaced a lot more often than the original factory spring in order to avoid inconsistent ignition. Not a problem for a range pistol, but could be a problem with a carry pistol.
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Old September 29, 2001, 08:46 PM   #3
Inspector Callahan
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Join Date: September 1, 2001
Location: Virginia
Posts: 372
I recently did the same thing with my Beretta Brig Elite. Feels like a custom trigger now.
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