I had a blackhawk one on a 12 gauge. They might make one
BlackHawk stopped production (of the BEST collapsable stock for the 20 ga 870 imo) 2 years ago. I sold my used NRS stock for over double what I paid for it new last spring. THAT is how in demand they are, they are even pricier now.
Big Al's "Take-Em" Style Silhouette Decoys Pro-Staff.