Adventure Airsoft does a compairson of timed and variable grenades for milsim and airsoftt use from Pulse Armaments and Dynatex... "Hi, This video explains my thoughts on a comparison of the Pulse Armaments B1 variable .209 grenade and the Dynatex timed grenade. Let me know your thoughts and usage of both in the comments and If your interested please us the 10% code below on the Pulse Armaments B1."