I have an 870P with a stock spring of 21" (4shot) and the spring I received from you is made for the +2 shot ext at 48". I have the +1 shot extension from you as well and am wondering if I need to cut down the spring to fit into the tube. It seems way too hard to compress enough to get the cap back on the tube. I figured 48"/6 shots = 8", so i was going to cut 8" off to have it work for the 5shot tube its now has due to the +1 ext.
Going to wait for someone's reply before I start snipping the spring.
Here's the build so far.
Going to wait for someone's reply before I start snipping the spring.
Here's the build so far.

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