Best answer: The new Halo Infinite Nerf guns will be available on Amazon as well as the Hasbro site itself. The Assault Rifle is up for preorder now, while the others are coming later this year.
On Halo Infinite Nerf guns and retail sites
As previously stated, we know that the full line of Halo Infinite-themed Nerf guns will be available on both Amazon and Hasbro’s website. This is because the Nerf Assault Rifle recently became available to preorder on these sites. Presumably, other retailers will sell the Nerf guns too, but we can for sure expect Amazon and Hasbro to sell them.
Aside from the Assault Rifle, two more Halo Nerf guns will be releasing later in 2020: a Needler and a Magnum, both of which you can see below. It’s extremely likely that Nerf also modeled these after the versions of the weapons coming in Halo Infinite, considering that the Nerf Assault Rifle is based on the Halo Infinite Assault Rifle.