Pattern the gun on newspaper from a similar distance you'd shoot trap... what, 16 yards or so is the closest? ... too see if you have a chance.
I have no doubt your tactical gun would be fine for trap, though for sure, there is a reason guys use longer guns... keep the shot pattern denser, longer.
I notice a significant difference in results simply having the wrong chokes in a 30" gun. Anything less than full choke on a trap bay is a struggle for me. It almost feels like you are shooting right through the clays, using the wrong choke, that won't break 'em.
Have fun & give it a try with your tactical gun, but be sure to compare and shoot trap with a full choked long shotgun.
Truthfully, every shotgun, can shoot different loads differently. Most novice shooters (myself included, my interest in trap shooting far exceeds my free time available) will not pattern their trap loads... and patterning your gun, trying different chokes at the very least, and if hunting or competitive, then trying different brands is important too.
My experience is most guys on a fun, open trap shoot day at your club won't mind letting you try their long shot guns.
Have fun.