It definitely shouldn’t require pulling the trigger to disassemble and since the magazine is not in the firearm at that time it’s not causing the issue. Is it a newer P320 or an older one? Bought new or used? Has it gone through their voluntary upgrade program?
Bought "like new" as trade in. Never fired. Hence the two std mags. I think the original purchaser was out of state or LEO.
Got it for a great deal and when I got home to watch the pewtube reviews, found out quickly I had a "pre-upgrade" version. Sent to Sig and within 3 weeks had it back with the new slide cut out and night sights installed at a discount. I should note that the wrong front sight post was installed and they had to send me a new one. Both when I first bought the pistol and when I got it back from the upgrade, the sights were visibly very off kilter.
I'm astounded by the lack of QC over there.
Right away I noticed I had to pull the trigger to release the slide - but shrugged it off at first. Put prob 2000 rounds through her since with nary an issue. But now that i've had it for a while, figured I'd address it.
I might just ditch the thing after I get it back. I'm so tired of Sig's BS.