My recoil spring is the same as the SR1911 in 45. You can buy a recoil spring scale if things like this really bother one. Brownells is out right now, which is where I got mine, but I see Dillion has them also.
https://www.dillonprecision.com/cont..._submit=Search
Have not gotten around to measuring the mainspring yet. Have put new stocks on the 10mm by the way. Here with the SR1911 with Eaglewing grips. I bought the ones for the 10mm back in 2013 off the shopruger website. Ruger called them Delta grips and initially I put them on my CMD but told myself that if Ruger every made a 10mm I would have to put them on it.
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