Some...not all...but some P30's will need a recoil spring "break in" period. Run some quality 124 gr or some NATO rounds through it for the first 100 round or so. You can also try leaving the slide locked back overnight...maybe longer.
The event you described can also be caused by limp-wristing. Has he had somebody else try the pistol to see if it does the same thing? Because this can rule out limp-wristing.
Regardless, HK already said it isnt the guns fault...So, it's either the shooter or the ammo.
The search function will help you realize that your friend isn't the first to have this issue. Give it a try...the search function, that is.
Good Luck!
The event you described can also be caused by limp-wristing. Has he had somebody else try the pistol to see if it does the same thing? Because this can rule out limp-wristing.
Regardless, HK already said it isnt the guns fault...So, it's either the shooter or the ammo.
The search function will help you realize that your friend isn't the first to have this issue. Give it a try...the search function, that is.
Good Luck!