I built a 7 RSAUM rifle and used a med length predator action from stiller and got there bottom metal with it and haven't had any problems with feeding. its a BDL style as well . The only problem i had with the build was waiting on the stock , being it was cut for the med action. Special order took about 30 weeks to get. Manners carbon fiber , but man was it worth the wait. built light weight for out west and ended up right at 6.5 pds w/o glass . Add a Z3 and its right over the 7.5 mark , balanced perfect..