SIDEWINDER VENOM™ SHOTGUN Magazine Conversion Kits

5 Rnd Box Magazine and Adjustable Stock, shown in A-TACS

Venom™ 5 Rnd Box Kit
Shotgun Magazine Conversion Kit with 5 Rnd. Box Mag
and Standard Forend


The Venom 5 Rnd. Box Mag Kit transforms your Mossberg 12 gauge shotgun into a Sidewinder Venom mag-fed shotgun system. The Venom Kit delivers faster cycle times and reliable, lightning fast reloads. Go from empty to fully loaded in seconds -- for the ultimate in home defense.

Kits are available for either 590 series or 500 & 88** Mossberg 12 gauge pump shotguns configured with 5/6 shot magazine tubes and 18.5" barrels. See our shotgun compatibility guide to confirm your specific model.

Complete shotgun magazine conversion kit for at home installation includes 5 rnd. box magazine, forend with action bars, magazine tube, barrel clamp, forend grip, emery cloth and installation guide.

Additional 5 round box, 10 round box and 10 round drum magazines are available for sale separately. Venom Kit Installation Services are also available by our assembly technicians.

Retail packaging





  • Designed for owner installation
  • Improved firearm versatility and performance
  • Durable polymer and alloy construction
  • Guaranteed reliable feeding
  • 5 round Box magazine
  • Compatible with 12 gauge - 2.75" ammunition
  • Ambidextrous design
  • Made in the U.S.A.


Gauge Total rounds Barrel length Choke Documentation
12 - 2.75" 5 18" Cylinder Installation Guide


Prices are for the conversion kit only. Fully pre-configured Sidewinder Venom magazine-fed systems are available through licensed firearm dealers.


500A Cruiser Shotguns with the 5/6 shot exposed thread magazine tube and heavy duty end cap require ordering of the "590" version of the Sidewinder Venom Kit.


Sidewinder Venom Kits are not compatible with Single Action Bar Maverick 88 Shotguns, or with Mosserg 500L (Left-Handed) Shotguns. See compatibility guide for details.


International shipping: Adaptive does not ship internationally at this time.