Lamb of God are joining in the Record Store Day fun by announcing that their 'New American Gospel' album will be released on special gray marble vinyl to mark the occasion.

Only 500 copies of the special edition release will be sold, with the remastered 2006 edition of the album's original track listing being used. The disc, which was the band's first release on Prosthetic Records, has been dubbed one of metal's best releases of the 21st Century. It features the single 'Black Label' as well as such standouts as 'Letter to the Unborn,' 'The Black Dahlia' and 'Pariah.'

Proceeds from sales of the Record Store Day release will go toward the Justice Now defense fund for Randy Blythe, who was recently exonerated of involuntary manslaughter charges relating to a concert death in the Czech Republic. Even though the case is over, Blythe still faces substantial legal bills.

Record Store Day takes place April 20 at participating independent record stores. To see which stores are participating and where you might find the Lamb of God vinyl, check here. You can also check out Loudwire's recent guide to the hard rock and metal releases heading to stores for Record Store Day here.