Again with the secret updates! Today, there is a hidden pyro update in addition to “World War Wednesday” Uber Update page. Right there as soon as you load the page. Yep, on the blackboard, a picture of a pyro with a great big arrow pointing to it – it’s a link to the pyro update.
Only one new weapon this time, “The Detonator”. Seems like a good name for it too, seeing as it’s a flare gun that detonates. Nice and simple! Details are scarce – “Alt fire detonates explosive flare” – but let’s take a guess – we shoot the flare, detonate it, and set nearby targets on fire. As benefits are rarely without drawbacks, I’ll take a guess at slightly lower damage, a slower moving flare, or increased reload time, though that’s pure speculation.
Sounds like a great weapon for setting distant enemy groups on fire, and a great addition for spy checking at a distance. Anyway, once again it’s exciting to find another secret. Makes me wonder if there’s a missed secret on page 1 – has anyone found one?
Bomadeno.com 
To craft it you just use 2 reclaimed metal and the flare gun. Definetly worth it, you can use it for a small jump boost, allowing the pyro to get up some places he couldn’t before, a good tool for a back burner wielding pyro.