WASHINGTON — The massive tax and spending cuts package that President Trump wants on his desk by July 4 would loosen regulations on gun silencers and certain types of rifles and shotguns, advancing a longtime priority of the gun industry as Republican leaders in the House and Senate try to win enough votes to pass the bill. The guns provision was first requested in the House by Georgia Rep. Andrew Clyde, a Republican gun store owner who had initially opposed the larger tax package. The House bill would remove silencers — called “suppressors” by the gun industry — from a...