Bullpup Unlimited Mossberg 500/590 Conversion Kit

Auction ID:19963
  • Retail Price: $ 299.00
  • Current Bid Price: +$ 0.45
  • Your savings: $298.55
  • Shipping Cost: $8.00

Bidding History

Each bid Raises the Auction by $0.05
  • Price Username Type
  • 0.45 LDozier7 BID
  • 0.40 Burdickz BID
  • 0.35 knifer BID
  • 0.30 Sal0126 BID
  • 0.25 LDozier7 BID
  • 0.20 Edelaney77 BID
  • 0.15 LDozier7 BID
  • 0.10 duckman5 BID
  • 0.05 Redneckone BID


Bullpup Unlimited Mossberg 500/590 Conversion Kit

Introducing the Mossberg 500/590 Bullpup Conversion Kit from Bullpup Unlimited, Inc.  This conversion kit will take your 500 12g shotgun and shave down almost 10" from the overall length while retaining all the practicality and reliability of the Mossberg 500!  All the tools needed for conversion are included and it can be done in less than an hour, not to mention it's fully reversible!
Designed to accept a wide variety of aftermarket AR-style accessories
Familiar AR-style grip and safety Split-trigger for increased safety
Variety of rail mounting areas for tactical accessories
Super-smooth and contoured slide release area
Rugged shell deflector for left handed shooters
Ergonomically shaped and easy-to-grip slide forearm
Generous access to loading port
Conversion assembles easily with tools provided
Easy to follow conversion instructions included
Multiple ambidextrous sling points for 1-point and 2-point sling
Field strips with tools included under butt pad
Manufactured from rugged, hi-tech, molded materials
Features an easy-to-grip, non-reflective surface texture
Does not in any way alter the original shotgun
Overall thickness: 2.75, width: 8, length: 28
*This item is the conversion kit only, gun not included. 
This conversion kit only fits 2 ¾ and 3 inch 12 gauge Mossberg 500 shotgun with plain barrel with bead sight. It will not work with a 3 1/2 inch receiver, ribbed barrel, 18.5 inch barrel with rifle sights or Mossberg’s with bayonet lugs or with a barrel brake that is non-removeable.

Maverick’s with the one piece forearm will not work(these are the newer models) must have a 2 piece forearm

For Any Questions about compatibility check - 


If you have any questions about assembly after you receive your unit you are welcome to contact our Bullpup Rep - J.J.

He can be reach by email or phone Monday thru Friday 10am - 5pm est.

 Phone - (270) 585-3447

Email -  bullpupunlimitedinfo@duo-county.com  - preferred method.
Bud's Item Number: 411555648

Please allow 2 weeks for shipping.