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Richard has owned his R9 longer than most people on here, maybe he can give the specific R9 info you are looking for.
John
Spring technology has come a long way in my seven decades of life, and Dan's post just above reflects the quality now available from spring manufacturers such as Wolff and ISMI:
http://www.gunsprings.com/ http://www.ismi-gunsprings.com/ An opinionated old armorer with whom I once served and who was more than willing to share his views on just about any subject you cared to discuss used to preach that semi-automatic weapon magazines "should be given a duty schedule of 30 days on, 30 days off." Although that man had forgotten more about firearms than I'll ever know, he was what you might call an obsessive/compulsive type.
Personally, I change out the magazines of my semi-automatic pistols twice each year, when I change the clocks. During that six-month period, all of my semis (except the true "safe queens") are kept secured but loaded. I personally elect, however, to back off one round from loading the mags to full capacity, except during range sessions. For instance, with the R9, I'll load the carry magazine with six rounds, chamber one, but I do not then top off the mag. I carry one spare magazine for the R9, which I load with five rounds -- a total of "lucky eleven" rounds carried for the piece.
I'm not preaching here. That's just my practice which I have followed out of habit with all of my semi-automatics for many years, and old habits die hard.
