I am using them also and have had the screws come out.
All they sent me was screws and a pratice head.
I've not shot a whitetail with them yet but I did shoot a hog
I use ground blinds with the shoot through screens.Never had a problem with my G5 montec but the bloodrunner opened when it hit the mesh.I could tell by the size diff in the holes in my screen.
The arrow hit true but I think allot of KE was expended when it opened.I got good pennitration and blood on the arrow but never recovered the hog.
I contacted NAP and the said to NOT shoot them through the screens so we will see if i get a shot at a whitetail.