if you're wanting  to change your Point of Impact we will need to know what your guns POI is now, so that we
can make the necessary adjustments to the new rib. If your not sure how high you would like your rib, we suggest
trying some Balsa wood from any hobby store, buy a couple sticks in different heights, tape to your barrel
(I use black electrical tape)  and mount your gun a few times with each size stick to see what works best for you.
You could even get pins used in sewing with the little white heads, cut one off leaving enough pin part to push
into the balsa and you now have a bead, go out and shoot a round and see how it feels and looks.
If you're not sure where to start we can make suggestions to get you going. 

ATTENTION PLEASE
shipping your barrel to us for rib installation
If your barrel just barely fits in its shipping box or tube when you ship it,
it will not fit after your new rib is installed. PLEASE make sure you get a
box or tube that will accommodate your barrel, new rib height and bubble wrap. I find that a 4" diameter box will work in almost all cases.

If the box you shipped in is to small for return shipping a
box will be provided and  $11.95 will be added to your bill total