I purchased a police trade in 870. I ordered a factory 870 +2 extension. When it arrived I installed it, The Issue I am having is that sometimes I can only load 5 shells. No matter how many ways I install the spring, tap the coupler, and do every trick in the book it still binds. I tried 2 different followers with the same issue. I tried using a Wilson Combat Spring and follower and it works perfectly. Only issue is the Wilson Spring is pretty short. Short in the sense that I can load 6 shells and push a 7th a little less the halfway in the tube. It cycles fine with no issues and does not bind. My question is this. Am I ok using this shorter Spring? Or will it cause issues when I go to shoot the gun?