Just got the 938 back today. It's cold and raining here in Iowa so the test fire will have to wait a day or so. They got the request wrong again. They listed it as light primer strikes instead of inconsistent.
The Gunsmith notes are as follows;
Inspected pistol.
Removed excessive lubrication from the slide and barrel.
Cleaned firing pin channel.
Replaced mainspring.
Function tested and test fired over 50 rounds with no malfunctions. The failure to extract and inconsistent primer strikes cannot be duplicated. targeted the pistol at 10 yards, target returned with pistol.
The pistol operates as designed it is within factory specifications for fit, function, finish, and accuracy.
Sounds like I'm just a boob that doesn't properly clean and lubricate his weapon.
I clean the firing pin channel with carbon remover on a pipe cleaner after every range trip,100-200 rounds, I didn't clean it before shipping so they could look at the condition it was in when it malfunctioned.
I put a caliper to the 7 empty cases they sent back with the pistol, from the primer strike to the nearest spot on the rim they measure;
.178
.1835 (looked centered)
.171
.181
.1805
.1765
.1685
The target included has a 7 shot group with a 1.42 spread, center to center. No mention if the cases included are from this group or if this was a machine rest group.
The barrel still slops back and forth and the primer strikes are are obviously not consistent, but I guess this is all to Sig specs and tolerances???????
I'll report back after a couple hundred rounds to see if the mainspring solves the FTE issue for me.