Airsoftjunkiez got the new TAGinn FBG-6 pyro grenade with a 2-second delay in stock and they demo it together with the 3 1/2 second-delay version... "The grenade will not detonate if you just pull out the pin, but  2.0S second after you will release the safety lever (happens when you throwing grenade).

All parts, includes safety lever, made of extremely safe polyurethane material and can’t harm anyone who properly equipped  for the game or training. The completely new pyro-element provides confidence in use. Be assured that that dry grass or leafs will not be set on fire or if the grenade will not accidentally detonate in your hand – it will not harm you.*

*The possibility of accident detonation is extremely low, but it’s not right to exclude it  at all. We can warrant your safety if grenade will detonate in your hands – ONLY IF YOU USING PAINTBALL/AIRSOFT SAFETY MASKS AND GLOVES."