I bought a Wolff extra power spring on eBay through Northwoods outpost, it came pre cut to 26 1/2 for the 930 SPX, I have not had a chance to fire it yet but the spring tension feels good in the magazine, I also added a NDZ performance follower mostly for the red color/ easy to see and looks...
I purchased a new Mossberg 930 SPX pistol grip 2 weeks ago, mine has the white plastic mushroom on the spring, I believe it is there to help keep the spring from binding. Also my stock spring was 36 inches long which seems a bit much, I purchased a Wolff extra power spring off eBay sold by...