Gun lobbyists are expressing dismay with a compromise on silencers included in the fast-tracked budget bill and the GOP’s slow-walking of another demand to stop the taxing and registration of commonly owned AR-15 style pistols. On Monday, the House Ways and Means Committee released its plan, and while it stripped a $200 tax on the sale of silencers, it still required registration and sale approval by the Bureau of Alcohol, Tobacco, Firearms, and Explosives. That angered some gun groups who have been calling for an end to the tax and ATF registration of suppressors, which many consider a hearing safety...