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Hey guys. I bought a STI mainspring housing (officers) to replace the stock one on a sig RCS. I pulled the spring and caps out of my sig housing and was just going to slap them in my new STI housing, but all of the sig parts are wider then the hole on the STI housing. So I pulled my colt out and took that mainspring housing off. Same problem the hole is just a hair to small for the spring. Now when I tried my S&W parts, they fit. But they are for a full size housing.

So I guess my question is, is the STI housing using different springs then normal? I plan on calling STI in the morning but was wondering if you guys could give any thoughts to this also?
 
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