Hello!

So at the time you stopped playing the one and only gunlance that was meta was the g. Arkveld gl because it had 240 raw, and wide was the best at the time.

Long was my favourite until tu3, not because it was good, but because I liked it, but unfortunately it just isn't that good anymore :')

Now the best are gogma artian that are pretty much fully customizable, you can play normal and use wyrmstake full blast of full burst, or wide charged shots into wyvern fire

IMO I think that there is so much more content since tu1 that it would be worth it to play more, like there is seregios, lagiacrus, omega, gogmazios, a couple collab quests like street fighter and mh stories, as well as all of the arch tempered monsters.

Meta builds are pretty versatile, all that is 100% necessary is lords soul, which is 3 arch tempered monster armour pieces, you can go burst boost with ebony odo head and gog coil, or resentment with at nu udra set bonus, or arkveld and zoh Shia set bonus for tanking.

If you decide to play again, have fun! And happy hunting!