diff --git a/src/mame/drivers/rungun.cpp b/src/mame/drivers/rungun.cpp
index 965449ab9ff..25f8f2b889f 100644
--- a/src/mame/drivers/rungun.cpp
+++ b/src/mame/drivers/rungun.cpp
@@ -429,10 +429,10 @@ static MACHINE_CONFIG_START( rng, rungun_state )
 	/* video hardware */
 	MCFG_SCREEN_ADD("screen", RASTER)
 	MCFG_SCREEN_VIDEO_ATTRIBUTES(VIDEO_UPDATE_BEFORE_VBLANK)
-	MCFG_SCREEN_REFRESH_RATE(60)
+	MCFG_SCREEN_REFRESH_RATE(59.185606)
 	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
 	MCFG_SCREEN_SIZE(64*8, 32*8)
-	MCFG_SCREEN_VISIBLE_AREA(88, 88+384-1, 24, 24+224-1)
+	MCFG_SCREEN_VISIBLE_AREA(88, 88+416-1, 24, 24+224-1)
 	MCFG_SCREEN_UPDATE_DRIVER(rungun_state, screen_update_rng)
 	MCFG_SCREEN_PALETTE("palette")
 	MCFG_SCREEN_VIDEO_ATTRIBUTES(VIDEO_ALWAYS_UPDATE)
@@ -488,10 +488,11 @@ static MACHINE_CONFIG_DERIVED( rng_dual, rng )
 	MCFG_SCREEN_REFRESH_RATE(59.185606)
 	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
 	MCFG_SCREEN_SIZE(64*8, 32*8)
-	MCFG_SCREEN_VISIBLE_AREA(88, 88+384-1, 24, 24+224-1)
+	MCFG_SCREEN_VISIBLE_AREA(88, 88+416-1, 24, 24+224-1)
 	MCFG_SCREEN_UPDATE_DRIVER(rungun_state, screen_update_rng_dual_right)
 	MCFG_SCREEN_PALETTE("palette2")
 
+
 	MCFG_DEVICE_MODIFY("k053252")
 	MCFG_K053252_SET_SLAVE_SCREEN("demultiplex2")
 MACHINE_CONFIG_END