Went to the range yesterday. One of the pistols in my bag was my newest, a Springfield 9mm. I posted a thread a couple weeks ago about the stock spring. Most feedback and my own hunch said it was about 14#. I replaced it with an older 18.5# (probably closer to 17.5#). I was concerned about short cycling but 200 rounds later those concerns were abated, no reliability problems. Recoil went from almost nothing to absolutely nothing. The sights popped right back on target. Pretty damn cool. One thing though when shooting at 25 yds the POI was noticably lower, about 2". I didn't realize the spring would affect the pistol that way. Then again maybe it was me.