The NSW government is facing a fresh challenge to its controversial lockout laws, with a new repeal bill forcing the NSW Parliament to revisit the issue before the end of the year.

The Shooters, Fishers and Farmers Party put the issue back on the agenda on Thursday by introducing a bill to scrap the 1.30am lockout laws that apply to clubs and pubs across Sydney's CBD and Kings Cross.

A Keep Sydney Open rally outside NSW Parliament House on Thursday. Credit:James Brickwood

The Shooters' MLC Robert Borsak, who moved the Repeal of Lock-Out Laws Bill in the Legislative Council, said it was time for Parliament to "revisit this issue" more than four years after the laws were introduced.

"While there may be many members who feel a little uncomfortable about this bill - some who might genuinely agree with leaving the lockout laws as they are - I am sure there are many others who would like to revisit this issue," Mr Borsak said as he introduced the bill.