Warning to Legion/X5 shooters. It has come to our attention that there have been a handful of shearing of Take Down Lever on this particular pistol model. IT DOES NOT AFFECT FUNCTION OF FIREARM. 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. 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. 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, Do not expect lifetime more than 5000 rounds.

It is good idea to periodically inspect the flat face of the Take down lever. There should be only slight curved wear impression at edges of flat face. If you have multiple semi concentric marks, you have a guide rod problem..

Bottom line we recommend Sig Stock Guide Rod and adequate Spring rate.