A unit that still has not been activated, and that has not been put on overwatch (or cannot stay in overwatch) can fire using oppotunity fire. But has to do anyway a reaction test or can for sure fire before a non-initiative unit that is reacting to an initiative unit?

A unit that has not been activated may react to another units action ...I think thats what you mean
Yes.
Does it have to take a reaction test
Yes.
Even units on over watch must take a reaction test to determine who shoots or moves first......Mikey

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"All Men for the rights of Every man, every man for the rights of all Men"

Well I am referring to the "Opportunity Fire" rule at page 68, where the rulebook says "An initiative Unit that has not yet been activated may sacrifice its activation for the turn to react to a Non-Initiative Unit's action or reaction" then it goes with the exemple but do not specifies if a reaction test is needed. I think yes, but it does not says so explicitly.

Yes the test is needed. To determine if the interruption is able to catch the other unit at a spot of disadvantage, or if the other unit completes its action first. Testing for a FOW draw, the infamous "1".

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Whatever the type of fire, the Round of Fire rule applies.

Pg. 17:

Round of Fire:Regular units can return or even pre-empt fire when attacked by another unit. When a Regular unit is fired upon, a Reaction Test is made to see who fires first. Fire is then resolved between each unit. This is referred to as a round of fire.

Under the main Round of fire rules on page 32:

When one unit engages another with fire, either as an Action or Reaction, a Reaction test is made to see which unit fires first. The unit that passes the test with the highest die score will fire first. In the case of a tie (or if neither side passes the test with a 4+), the initiative unit will fire first.

There are several other sections that reiterate this as it's a pretty important mechanic.

So, we may not say it explicitly in the Opportunity Fire section, but Cerberus is right - a Reaction Test is definitely required.

Hope this helps clear things up!

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Shawn Carpenter
Game Designer, Ambush Alley Games

"I don't wanna be remembered as the guy who died because he underestimated the threat posed by a monkey."

Pretty cleared up! Just one last thing... opporunity fire is still reserved to regular AND trained units?

Irregular forces cannot use the opportunity fire then,nor can do that the green regular forces?

Ive looked at the relevant rules section and taking in mind that Non Initiative Units may only react by fire or movement ONCE per turn, Id say it was more a matter of Initiative Vs Non initiative units being able to conduct opportunity fire......Mikey

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"All Men for the rights of Every man, every man for the rights of all Men"