According to Billboard, both AC/DC and METALLICA are back on the Billboard 200 albums chart this week. The US publication/site states:
Back In Black (No. 123): Absent from the list since the August 31, 2013-dated chart, the band’s best-selling album returns to the list (up by 49%). First released on Atlantic Records in 1980, it was reissued on Columbia Records in 2003. The combined SoundScan-era (1991-present) sales of the two sets stand at 7.1 million.
Metallica (No. 146): At its current rate of sales (about 2,000 to 3,000 per week), this album – first released in 1991 – should surpass 16 million in about three or four months. The set (often referred to as The Black Album) is already the best-selling album of the SoundScan era, and has been since the week ending December 20, 2009.