Hey guys,
I bit the bullet and bought the raptor. When I first put it in dry, it binded, lubed it up and worked it in, I charged the handle till it moved almost freely took it out cleaned and relubbed. Found the nipple on the top front rubbing, filed the nipple off, cleaned and relubbed, it works great, no need to deepen the valley. Awesome handle, million times better then stock, if you have a scope its a must.
In all I just chopped the nipple off the top, lubed and cleaned it a few times and that's it. So don't go strait away grinding stuff, I really didn't even have to cut the nipple off but, it did help it move easier..
Hope this helps,
James