I have an FWS 16ga made in 1948 with a single trigger and ejectors. With snap caps in place when dry fired, the right barrel is nice at around 3-4 pounds. The left barrel is a hard pull at around 8-10 pounds. This is not dependent on which barrel the single selector is set for. Any easy fix's? I have read where the lock plate screws could be to tight or the stock screws. If so which ones? Thanks all.