Problem Only X5 Legion, some Spectre, some AXG, No other models effected.
Problem with uncaptured guide rod. IT DOES NOT AFFECT FUNCTION OF FIREARM. This is not just a problem with our brand. Stock Sigs have same issue. Other models are not usually affected, The usual place is at Mag knife safety groove. So gun still functions fine but External part of Take Down lever becomes detached and absent. Common factors are using too light of spring, less than 14#, pressing down on Take Down lever during ignition, custom guide rods, or hot loads. All other P320 models use spring and guide rod specifically for that model.
HOWEVER, Some guide rods will sometimes tilt differently during unlocking putting asymmetric force very high force on Take Down lever which takes most of the recoil battering. Tungsten produces more impact. Other custom guide rods have too small of OD which also increases battering. Another factor is Springs that are too long, then they bunch up during recoil, affecting the trajectory of recoil rod.
NOT TOO Bad
Doc recommends variable rate springs for 1911 of 14# or higher,and check to see it does not bunch up. Ideally, a flat wound spring does not bunch up easily.
Show beginning of asymmetric wear, due to guide rod ocillation, failure in future.
If you are shooting a load higher than 130 PF you may to increase recoil spring weight to 15 to 17# depending on how hot your load is. Any Take Down lever on any Sig p320 and variants is susceptible to this problem however much more so on X5/Legion. So if you shoot lots of rounds it is wise to consider it a consumable part that should be replaced periodically. (This similar to Sig's recommendation). Normal loads on most of the P320 should make the Take Down Lever last a long time. But if shooting hot loads with light springs with Legion/X5, expect it to be replaced more frequently.