The Tac-79 comes with one 4" Picatinny Rail mounted at the 12 o'clock position on the breech end of the barrel.
The barrel also has a 6" rail on the bottom.
The basic specs of the Tac-79 are as follows:
Designation: Launcher, 37mm, Single Action, Exposed Hammer, Top Break
Country of Origin: USA
Manufacturer: Ordnance Group LLC, Sarasota Florida USA
Caliber: 37/38mm (1.5”) Rimmed Ammunition
Barrel Length: 12” (30.5cm). Fully enclosed rim. Transverse pin lockup
Dimensions (Tactical configuration):
Nominal Trigger Pull: 1.5lbs (0.7kg)
Safety: Ambidextrous Hammer Block
Stock: Six Position Adjustable AR stock
Foregrip: Vertical, may vary from illustration
Pistol Grip: A2 AR compatible grip
Materials: 6061-T6 Aluminum. 4140 Steel. All materials sourced from the USA
Finishes: MIL-A-8625 Type II Anodizing and Mil-DTL-13924D Black Oxide
Picatinny Rails: One top 4” and 6” bottom standard (Mil-STD-1913).
Drilled and tapped to accept any AR compatible butt stock using only the buffer tube, castle nut and alignment plate. Buffer and Buffer Spring are not required.