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Stoeger M3020 Defense 20GA 3" 18.5" Black 4+1 Semi-Auto Shotgun 31872

SKU 31872-Stoeger

List Price $579.00
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FFL Restrictions
FFL Requirements
This item can only be shipped to a Licensed Federal Firearms Dealer. Please see our Shipping Policy to review firearms shipping requirements.
Export Restrictions
Government Export Restriction
This item may be regulated for export by the U.S. Department of State or the US Department of Commerce. Please see our Export Policy.


The Stoeger M3020 Defense Shotgun offers outstanding quality and reliability for a semi-automatic shotgun in its price range. The M3020’s semi-automatic capability is due to Stoeger’s ultra-reliable Inertia Driven® action. The M3020 Defense is outfitted with a Picatinny rail on the receiver perfectly positioned for a red dot sights -- but if iron sights are more your thing, Ghost Ring sights come standard on the M3020 Defense. On the end of the magazine tube there are three short Picatinny rails at the 3, 6, and 9 o’clock positions, perfect for mounting flashlights or tactical lasers.

The M3020 is chambered for 20 gauge shells making it softer shooting and ideal for people with smaller frames or those who are recoil sensitive. The M3020 will accept 3" Magnum shells, so make no mistake -- this shotgun is a more than capable home-defense gun. If you’re looking for a 12 gauge home-defense shotgun, Stoeger some quality and affordable offerings including the M3000 Defense, P3000 Defense, and Double Defense.

Features of the Stoeger M3020 Defense Shotgun

  • Picatinny Rail Mounted On Receiver For Optics
  • Magazine Tube Mounted Picatinny Rails
  • Inertia Driven° Semi-Automatic Action
  • Tactical 18 Inch Barrel Length
  • Standard Ghost Ring Sights
  • Sling Attachment Points
  • Accepts 3" Magnums
  • Soft Shooting


  • Action:Semi-Automatic
  • Gauge:20 Gauge
  • Max Shell Length:3"
  • Length of Pull (LOP):14-1/4"
  • Weight:5.5 lbs.
  • Magazine Capacity:4+1
  • Barrel Length:18.5"
  • Overall Length:40.75"
  • Choke:Cylinder Fixed
  • Type of Sights:Ghost-ring
  • Stock:Black Synthetic
  • Caliber or Gauge:20ga
  • HandednessRight Hand
  • Drop at Heel:2"
  • Drop at Comb:1-1/4"
  • Product TypeShotguns
  • Item ConditionNew
  • UPC037084318721
  • MPN31872

Customer Reviews

Average Rating
August 13, 2019

Dear Sir I am interested to by the magazine tube mounted Picatinny rails for my Stoeger M 3020 20 Ga. (in front at the magazine caps) your SKU Stoeger 31872 Can you kindly help me? Thanks so much. Best regards. Enrico.E. Sala

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