This sounds odd. Pictures would help. Cutting off the front trigger won't allow the gun to fire both barrels, only the left barrel. It is possible, although very expensive and difficult, to convert a single trigger Parker to double triggers or vice-versa. Many new internal parts needed (including trigger plate) and stock inletting is not the same. A spare receiver would be needed (and possibly a spare buttstock). This is according to Jack Skeuse at Reagent Chemical when I inquired about converting a ST Parker Repro to DT (there are sure a lot of single trigger Repros out there for sale!).
Joe
