OK!!! I officialy say this topic has been solved! So I'm gonna lock it. Thanx a lot to DBR_ONIX and of course, General Barron!!
For anyone who wants to know. Here is how to import your own weapons and then make anims with them. (note: only for primary and secondary weapons)
First, from the OFPAnim demodata folder, open - using O2 - mc tankinstae 2 or 3. Then, go to the box on the bar on the right and look at the selections/proxys box. There will be proxys like "proxy: ak_47" and the like. DON'T JUST CLICK AND PRESS DELETE AS THIS WILL NOT DELETE THEM!!!! You have to right-click on them and select delete (makes all the difference, trust me). Do the same for all of the proxys. Then, find the zbran (and roura if you want a weapon to be in the secondary slot - that's like the LAW and the RPG) selection and right-click, delete them.
OK. Next, (don't exit O2 just yet) save the new .p3d as whatever name you want - not too long - and put it in a new folder called whatever you want. Then, back in O2, load the .p3d file you just saved and go back to the selection/proxys box. Create a new proxy for your weapon (for posistioning of the proxys, check the external viewer - Bulldozer. Or, as in my case it doesn't show up, use OFPAnim to check it out) and call it whatever. Prefferable related to your .p3d of the weapon. Then, left-click on the proxy you just made and then right-click, and "new". This will make a new selection using the same points as your proxy. Call it (if its your primary weapon) "zbran".
If its your secondary weapon call it "roura".
OK that's all for O2. Save and exit.
Open up OFPAnim (if you haven't already) and load your .p3d (of the man - who is gonna hold your weapon). You might need to move your weapon .p3d's to the OFPAnim folder. I dunno. So, in OFPAnim edit the frame and scroll down right to the bottom of the "tree" - the thing where you select your parts that you want to move - and move it to the desired position. This isn't an OFPAnim tut, its just so you can use your own weapons. Now you should be able to create a custom anim, using your custom weapons!!
Confused
. Just PM me and tell me what's going wrong and I'll help you fix it.