THE firebrand Shooters Party MP Robert Brown could be forced to put down his guns. Police are looking into claims he should be stripped of his firearms licence after making a death threat to a political opponent on the floor of NSW Parliament last week.

Mr Brown took aim at the Greens MP Jeremy Buckingham on Wednesday during a debate on Mr Brown's Game and Feral Animal Control Amendment Bill, which will allow hunters into national parks.

Outburst ... Shooters MP Robert Brown was forced to apologise after threatening a Greens MP during parliamentary debate. Credit:Jon Reid

During the outburst, Mr Brown lamented that he could not take Mr Buckingham outside and ''beat him to death''. Earlier in the week, Mr Buckingham reported Mr Brown as having told him ''no amount of fluoro'' safety vest would save him if Mr Brown saw him in a national park.

While Mr Buckingham took the latest verbal assault on the chin - and Mr Brown apologised on the record - a furious member of the public, Robert Brewster, has taken the matter further. Mr Brewster, a 33-year-old environmental scientist, has lodged an official complaint with the police and state government, claiming Mr Brown's apparent lack of control of his temper should disqualify him from being allowed to own a gun.