Is the takedown lever on a 365 supposed to have spring tension? I can hardly rotate mine and cannot rotate it far enough to field strip the gun due to the excessive spring tension.

finally got it.

I don't think the takedown lever is under any spring tension, just very stiff the first few times you operate it. (This is on my personal P320, but the 365's design is similar.)

I find that reaching over the top of the slide with my thumb and pressing the lever down makes mine much easier to rotate.

First few times on mine I used the mag baseplate against the take down lever. Helped give me a little leverage.

I grab the lever using a doubled up towel and that makes a big difference