The fix:
Order a replacement mag catch spring from Wolff Springs. They are sold in packs of 5. https://www.gunsprings.com/index.cfm?pa ... mID=58#950 . For a heavier spring Item 21786, for a lighter spring Item 21785. Have the new spring on hand before doing anything else. The spring and the plunger in the mag release are extremely tiny parts and easy to loose.
Step 1: Remove the Mag release/catch as shown in this video:
https://www.youtube.com/watch?v=-JPB57a ... b_imp_woyt
Step 2: The User manual shows how to replace the spring - page 36 & 37 in this:
https://snwcdnprod.azureedge.net/sites/ ... 000_nc.pdf
The process should be the same for all the M&P Shield models.
