Jennifer Dees, from Hull, launched Stanley's Law to educate and change the licensing of air weapons following the tragic death of her son.
Six-year-old Stanley Metcalf was shot dead by his great-grandfather Albert Grannon at the 78-year-old's home in Sproatley, East Yorkshire in July last year.
Since his death, Miss Dees has been campaigning to make it an offence to use, possess or acquire an air weapon without a certificate in England.
An online petition has already been signed by more than 13,000 people meaning it will receive a response from the Government.
But in a major step forward this week, Stanley's Law has received backing from a number of MPs including Hull North MP Diana Johnson, Hull East MP Karl Turner and Delyn MP David Hanson.
Ms Johnson has now written to Home Secretary Priti Patel to request a meeting to see how they can make Stanley's Law happen.
Miss Dees said: "We have really moved forward with Stanley's Law and to have backing from some of our MPs is brilliant news.
"I feel like the campaign is really gathering pace and that we are possibly going to get Stanley's Law in place sooner rather than later.
"My ultimate goal is to sit down with the Home Secretary and tell her all about our concerns and what needs to be done."
Scotland and Northern Ireland have licensing laws, but in England and Wales you do not need a licence to own most air guns.
The power limit is set at a muzzle energy of 12ft.lb for air rifles and 6ft.lb for air pistols.
The pensioner, who was jailed for three years, had the weapon modified to make it more powerful, but did not apply for a licence thinking he would not get one because he was partially disabled.
Miss Dees said: "Even if the air weapon my granddad had wasn't modified we were told by an expert that it would have still killed Stanley.
"People say air weapons are not dangerous, but I have the proof they are as Stanley is dead as a result of one.
Since Stanley’s death, friends and family have been fundraising and hosting a variety of events to remember him.
A special peace garden has also opened at Stanley's school in Bransholme, Hull
Fundraising for the garden was made possible thanks to the kind generosity of friends and family and Hull charity the RICH Foundation, which helps to support bereaved children.
The school recently held a special workshop with Hull Beats Bus where the children got to write their own rap song in memory of Stanley.