As you correctly surmised it's just the powers that would accept the proc.
In the case of the Commando this would be: Slug, Buckshot, M30 Grenade and LRM Rocket - looks like it might be well worth it 
There's also the chance for smashing damage knockback set proc - should work nicely with all those AoE powers, and it's a good bit cheaper than the FF proc 
Depending on slotting you might even be able to fit both in.
@Hakeswell
Union Ilservian, Evinlea
Defiant Expeditor, Hakeswell
Arc: 70119 Hellion Initiation
Also the tier 1 pets can be slotted with the -resist proc (achilles heel?). Funny though, while 3 pets shooting nonstop with -def, it hardly triggers that often.
So after that one, i gave up on the procs. Added that very often the 'debuff' icon shows up on my character, rather then the mob.
Note, i have both procs on my AR blaster, they trigger really often.
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
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Hi.
I was wondering about how procs work in pets. For example, according to Mids Hero Designer I can slot a force feedback chance for recharge in my Commando. So, will the proc check to go off every time the Commando shoots or only if he shoots an attack that would knock back (the reason it can be slotted I presume)?
Any help would be appreciated
@Moondog
Union:
CoH: Moondog (WS); V-Rock (Tnk, semi-retired); Pole-Star (Bla); Demon Dog (Scr).
CoV: Midnight Gunner (Corr); Operative John Doe (Ban); Day-Star (Dom); Commissar Jaeger (MM).