FAB Defense M4 Folding Buttstock for Remington 870 Black AGRF870-FK. Specifications for FAB Defense AR15/M4 Collapsible Buttstock for Remington 870 w/ Shock Absorber Option: Manufacturer: FAB Defense Gun Model: Remington Model 870 Gun Make: Remington Gun Type: Shotgun Condition: New Gauge: 12 Buffer Tube Size: Mil-Spec Length: 12.7 in Features of FAB Defense AR15/M4 Collapsible Buttstock for Remington 870 w/ Shock Absorber Option Rock Solid One Piece Ergonomic Design Special Non Slip Texture Made from Reinforced Composite Materials Enhanes Natural Fighting Stance Hold on Your Shotgun Slightly Angled to Counter Recoil Improved Performance in Reaction on Target Time and Muzzle Control when firing No Gunsmith Required Provides Storage Compartment for Batteries or Cleaning Kit Allows Optional M4 Style Aluminum Buffer Tube and Our Famous GLR-16 Butt Stock Upgrades Package Contents: FAB Defense AR15/M4 Collapsible Buttstock for Remington 870 w/ Shock Absorber Option What firearm models does the manufacturer say FAB Defense AR15/M4 Collapsible Buttstock for Remington 870 w/ Shock Absorber Option is compatible with? The manufacturer says that FAB Defense AR15/M4 Collapsible Buttstock for Remington 870 w/ Shock Absorber Option is compatible with Remington Model 870Mako AGRF870-FK Remington 870 Shotgun Aluminum/Steel/Polymer Black