Re: Margpul PRS LOP extension
Is there something about the PRS that you need over the UBR? The UBR is really better in every way.
PRS LOP adjustability:
10.45 to 11.45 (1 inch)
UBR LOP adjustability:
11.10 to 14.46 (3.36 inches)
So the UBR has a wider adjustment range than the PRS and it can be adjusted longer than the PRS. The UBR also has a storage compartment, QD sling attachment, sling loop, and an adjustable preset for opening the stock to your favorite spot every time.
The PRS has, uhhhh, a cheek rest. And I hate the cheek rest. I've noticed in order to clear the full length of the charging handle, the cheek rest is way too far back. In order to use it with the eye relief of magnified scopes, my head is mostly forward of the cheek rest. This means all the cheek rest does is make an annoying sharp feeling as I am half-on, half-off the cheek rest.
So my suggestion is to sell the PRS and get a UBR unless the cheek rest is a must-have feature and it works for you better than me and almost everyone I know.