This is a Spike's Tactical Stand Alone 12" Havoc Launcher with the AGP Side Folding Stock.

This Side Loading Launcher is CNC machined from solid billet 6061-T6 Aluminum and 1018cr Steel. One piece Launcher Tube and Hand Grip design - cylindrical Push Button Breech Lock - Extended Tube opening Supports 5 3/4" long cased USCG approved munitions - Durable Matte Black Finish - Mounts rock solid to carbine length rail system or longer. The 37mm Havoc Flare Launcher features the latest in design and manufacturing technology. Parts are CAD designed and CNC machined from solid billet material rather than the typical stamped and welded construction of other launchers. The 6061 T-6 aircraft grade aluminum components are anodized in a non-glare matte black finishing for maximum durability and ease of maintenance. Additional components are built from 1018 cold rolled steel and plated with a mil-spec black oxide finish. The proprietary STZ push button cylindrical breech lock design is 3 times stronger than existing lever lock systems. 

The Side-Folding Stock features an AGP folding stock and is compatible with most aftermarket AR-15 pistol grips. 

 -Spike's Tactical Pro Grip 

 -Mil-Spec 1913 Picatinny Top Rail