trap gun barrel cooling adapter.

my sons trap gun seems to be running hot enough to distort the bird after around 75 Ish shots. even with the break at 50 rds. it's really noticeable on hot days, and I'm trying to find a way to cool the barrel without water or a damp cloth. i got one of these mini hand blowers for dusting and stuff like that. he shoots a Beretta A300 ultima and the rib isn't that high; he shoots pretty flat as well. so, his sight picture is getting distorted by the heat mirage after 3rd set. I made this adapter to fit in the cone that came with the blower to fit in the choke easily and direct the airflow through the barrel and out of the ejection cut out. petg is recommended or higher temp material.
https://a.co/d/0f0ijio0