TP9SFX Spring Options
These are the springs that I have used and tested. Your mileage may vary based on your ammo load.
1. Wolff Cold Commander - 13LB: item 42213, 14lb: Item 42214 & 15lb item 42215https://www.gunsprings.com/COLT/COMMANDER%20SERIES%20PISTOL/cID1/mID1/dID2
M&P 5" Spring Options
Springs that I know work. Your mileage may vary based on your caliber and load.
Yes these are listed as Glock but I know work with the 5" M&P guns. The 437## size. The ## is spring weight.