First of all, why on earth have you posted this topic in the off-topic forums when this is clearly a very on-topic subject for Project Reality? Moved to General Discussion, please post in the correct area next time...
As for your question, tbh I myself do not know that much about the IRA, its really more before my time and [R-DEV]Gaz would most likley be our main expert on this subject.
From what I understand thou (which could be completely wrong), is that in at least the last 10 or so years, probably even longer, there have not really been any "battles" and really only undercover terrorist activities like planting bombs and other hit and run tactics.
How can we make a map in Project Reality, which aims at bringing realistic
battles, to something that didn't have any real battles?
With the wars in Afghanistan, Iraq, etc, even thou there are plenty of undercover terrorist activities, there are also many huge battles happening every day which is what we portray in Project Reality, not someone trying to put a bomb on a plane or something along thous lines.
So for a start, crating the IRA from a gameplay point of view is not feasible.
Now if that isn't enough for you, then there is a lot more reason on top of that why we haven't made any IRA maps.
The first obviously that we would have to make European maps, which if you look around the PR or vBF2 files, you will find very little in the way of statics that we can pass off as European, epically not statics that belong in Ireland or the UK... Mappers would be basically starting from scratch with the need of crating many new statics and that is a huge amount of work which tbh, we don't have the man power for since now I'm the only active member of the team who has any real experience of making static objects for BF2, and I'm up to my neck in work.
Next is that the main IRA conflict is long gone, what you hear in the US is most likley far from the truth as I'm sure [R-DEV]Gaz will fill you in later on this. But with keeping in mind that the main part of the conflict was a long, long time ago, much of the British Army kit has changed drastically, epically over the last few years. Much of the equipment we have in PR is far to futuristic for an IRA battle and as such, we would have to make new models of old kit...
So to quickly summaries, from a gameplay POV, its not feasible, we would have to make a huge new range of static objects and maps and to top it all off, we would have to make lots of new models to represent old British Army kit.
So as you can see, its not about any moral issues as to why we haven't done it, I can tell you now that many of our Military advisor know many people who have been killed and wounded in Afghanistan and Iraq, there sacrifice if anything only inspires us to do what we do to make sure they are not forgotten.
Now if you believe its still worth making the IRA for PR, your more than welcome to give it a shot yourself.
Here is all you need to know about making maps:
https://www.realitymod.com/forum/f189-m ... rs-up.html
Here is most of what you need to know about making staticobjects:
https://www.realitymod.com/forum/f189-m ... cture.html
And as for modelling new weapons/vehicles and other bits of kit, I'm sure you could find some willing community members to do it....
Have fun!