I emailed Pietta's customer service and explained the problem. Turns out that a few years back they tweaked the design and put a deeper trigger guard on - hence the longer trigger.
They offered to cut down the trigger for me and send it to me gratis. Being a tad cheeky I jokingly replied 'or you could send me the new guard so I can swap them over.' I heard nothing further by way of a reply to my email.
This morning I received this little lot in the post - new trigger guard, a trigger, and grips.
How's that for customer service!
