For the ultimate birthday party rent a package of Nerf guns and have a huge Nerf War. With several packages available starting at £60 for 10 kids we are sure to have the package for your needs and can accommodate up to 40 kids. This service is only available in the UK, go to http://www.Nerf4hire.com/ for more details.
Check out the promo video from affiliate Nerf 4 Hire on their Nerf party blaster rental. This is a very nicely done video if I do say so myself.