I have modified a gen 3 PRS to fit the longer 762 extension, you may be able to do the same with the lite. But I'm not sure, and I would not change the 762 extension for anything else.
I have a B5 Precision Long on my PredatOBR and it works well. Has to be on position 3 or higher to not interfere with the charging handle - which is perfect for my hold/cheek placement.
“There's a lot of people calling for the end of violence...I am glad Sam Adams, Thomas Paine, the actual Tea Party guys, the men at Lexington and Concord didn't feel that way.” - the man with the golden EIB mic.