I sold my Tippmann Freakbacks(A5,98) cause iīm not getting happy with !!!
Problem is that the Tippmannbolt is diving into the barrel and after Firingposition itīs getting tighter to insert level. So if you use a big insert which is too big for the paint may helps but you will have allways an edge which could kill paintballs !!!
I would use Freaksetīs just for other markers than Tippmanns cause of the barrelconstruction !!!
Here on the pic you can see an AA-Back(right side) and a A5 Freakback(left side .697 inside) for A5: