Depends on the balance point you desire, and if you want a 25# rifle or not. I have a acc elite with 2 barrel bridges close to receiver, dampeners in butt, zco 527, archimedes action ans a 28" heavy comp contour pipe and a gen3 fat bastard on the end. Weighs 22# and balances 3-4" in front of mag well. I have weights but sold em as I like how it sits.