The original pins for the Corsair aren't easily removable for the long muzzle & stock core. I added a head to those pins so you can convert the Corsair to long or short whenever you want.

Print two Muzzle Pins. Only 1 Trigger Pin is necessary. I suggest 5 walls & 100% infill.

This is a modification of two pieces from the paid files. Full blaster available here:

https://www.etsy.com/ca/listing/1509623188/corsair-break-action-single-shot