Misfire for firearms

I'm in a game where I have 3 guns now each with a different misfire threshold and it's getting a little much to remember and check each time if it is a misfire for that gun. So I was wondering if there was a way to have a box pop up in chat when an attack does not meet the threshold for that gun. I did think about just using  20cf< but from that I read when I hit the level where I crit on a 19 those two will not work  together. 

You can have both cf and cs specified in a roll.  /r d20cf<5cs>15 or [[d20cf<5cs>15]] for the inline roll version

I threw this into the crit range for the attack roll in order to test it [[d20cf<10cs>15]] But it isn't showing as a failure, butt the crit was a 16 so that part did work

You don't want to put the whole roll in the crit range, you just want to put the crit declaration in there. Put just this in the crit range of the weapon on your sheet: 20cf<10 Replace the 20 with whatever your critical threshold is and the 10 with whatever your fumble threshold is.

That worked thank you