PC
PLATFORM: Steam
SYSTEM INFO:
    CPU: Intel(R) Core(TM) i7-9750H
    RAM: 16.0 GB
    OS Version: Windows 10 Home
    ISP Provider/Speed (upload/download) / Connection Type (LAN or wireless): Comcast 15/85, Wireless
ISSUE: Hand Cannons aren't stunning champions
REPRO STEPS: 
Step 1: Load into the game.
Step 2: Equip Unstoppable Mod
Step 3: Equip Hand Cannon (I've tried Frontier's Cry 1580, Waking Vigil 1580, and Eyasluna 1580 (Videoed))
Step 4: Load into Activity with unstoppable champion
Step 5: Get to Champion and test.
ACTUAL RESULT: Hand Cannons aren't stunning champions
EXPECTED RESULT: Hand Cannons should be stunning Champions, If a Semi Is barreling down the road at you are you going to wait to open fire to stop it or just start lighting it up. I think most would choose the latter option.
LINKS: 
https://youtu.be/7AR9MfbA9ho
I 1st discovered this in season 19s mission on step 4 playing on my titan. But I've tried it on all my characters with 3 different hand cannons on those characters.
						
					
					
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	Hello there[url=https://cdn.discordapp.com/attachments/902560216871239752/989591085506515074/Hellothere.gif],[/url] You have to hold ads for 1-2 seconds, without firing to proc Unstoppable. Bungie is investigating the length of time needed to proc it, but the key is you cannot fire while waiting.