Need to know drop rate of longbow sniper

Can anyone tell me what the drop rate for the LONGBOW sniper rifle?
does it increase on TVHM and UVHM?
what is it for normal?

also the only way to get it is from the badass creeper right?

thanks

Most of the data on specific drops like that was accumulated before GBX increased the drop-rates, and it takes a long time to get any meaningful data for these things. As far as I know, the Badass Creeper is the only place to get it, but it’s not the only potential drop - there’s a chance of getting the Blockhead. Legendary drop rate should be 1 in 10, so expect to do quite a few runs before you get either a Longbow or a Blockhead (but not as many as you would have done more than a year ago!)