Forgot to tell ya - the cyclone side has a smaller 'rimfire' rail instead of the usual Weaver/Picatinny rail - this is the block I used for this mod:
TAG's laser sight rail mod for UMS Rail (RIS Mk.2)
It's good and solid. I just can't remember where I put the rail I took off. Oh well, maybe someone can graft a 3' Weaver/Picatinny rail section back on it. Perhaps FL/\ can send you a replacement, considering the project?
I will say this for it - it does help the '"balance-ability" of the A5 with that on it. I know it will hellp make the PIF great !!
--TAG--