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Bullpup Unlimited Remington 870 Conversion Kit

   38 Reviews| 5 Questions & Answers
Model: BPU870
Condition: Factory New
Bud's Item Number: 411554177
UPC: 631661599628

Bullpup Unlimited Remington 870 Conversion Kit

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*Please Note!! Many of our pictures are stock photos provided to us by the manufacturer and do not necessarily represent the actual item being purchased. Please verify this picture accurately reflects the product described by the title and description on this page before you place your order.

Introducing the Remington 870 Bullpup Conversion Kit from Bullpup Unlimited, Inc.  This conversion kit will take your 870 12g shotgun and shave down almost 10" from the overall length while retaining all the practicality and reliability the Remington 870 is known for!  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. 

*Will not fit 3.5" models, a ribbed barrel, or rifled sights. ATI extended magazine tube will not work.

*This model will only work with Remington 870 12g shotguns.

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-  - preferred method.

Product Reviews

38 Reviews. 4.3 of 5 Stars!

5 Stars:
66% (25 of 38)
4 Stars:
19% (7 of 38)
3 Stars:
5% (2 of 38)
2 Stars:
5% (2 of 38)
1 Stars:
5% (2 of 38)
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Reviewed By: on 08/03/2020
Rating:     1 of 5 Stars!

I was disappointed with this product. The screw holes were not milled all the way through. It appears to me to almost be made of cheap plastic instead of polymer. I followed the manufacturer video that was fast and somewhat misleading when it came to instructions mostly with the screws you were to start by hand. The other issue I have is that for some reason my 870 safety keeps engaging not allowing me to fire the shotgun from time to time. I would not recommend this product, it does not seem reliable and the quality is not what I was hoping for.
Reviewed By: on 05/18/2020
Rating:     5 of 5 Stars!

Fantastic Piece of equipment. Fit and finish was appropriate, especially for the price-point. Instructions were clear, and fitment was simple, took about a half hour.
So far I have over 1,000 shells through it and haven't had a single issue.
Reviewed By: on 01/14/2019
Rating:     4 of 5 Stars!

I ordered one of your stocks for my 870 after doing extensive research of reviews. Much of the complaints were regarding durability and finish quality. As with most things the unsatisfied are the loudest. Given some of the reviews dated back to 2014 with more of the recent being very positive, I purchased from Buds in Kentucky. Overall satisfactory. However two flaws. First, the holes for the adapter block to enable the attachment to the shotgun we're molded yes but they were sealed over on the ends obviously a casting issue. Simple enough to solve for anyone that has any experience and a drill. I had never seen this complaint previous to my purchase . The second issue however is the quality in the steel of your screws. One of the four inch screws that holds the top and bottom halves of the chassis together cannot even be tightened because the edges on the button head for the hex wrench were rounded. Overall given its a 300-plus dollar item at a minimum since this is a chassis the hardware should be steliar. Being a chassis it's expected that in order to properly clean the firearm at least on occasion the chassis should be removed so the firearm can be completely cleaned. I'm disappointed in this fact for a lot of the complaints that many reviews had are not substantiated. It seems like a relatively sturdy chassis. The stock is now sturdy as can be without a single rattle when shaken. Another complaint was failure to eject. It's been converted into a bullpup. Yes it takes adjustment but I have yet to experience a failure to eject due to short stroking. While I prefer a purpose-built weapon, this chassis does what it's intended for the 870. contacted Bullpup Unlimited and within a couple of days not only did they send a replacement screw for the one that was substandard, they threw in extra screws of the other sizes. Overall satisfied.
Reviewed By: on 01/07/2019
Rating:     4 of 5 Stars!

Nice bullpen conversion kit,everything you for home defense bedside protection
Reviewed By: on 06/07/2018
Rating:     5 of 5 Stars!

I converted a conventional 870 riot gun into a bullpup using this stock. It was easy to do and looks awesome. If you have a need for a compact shotgun, this is the stock conversion to get. Well made, easy to do, reasonable price.
Reviewed By: on 11/27/2017
Rating:     5 of 5 Stars!

Great mod for my 870 shotgun. Balance with one hand and less strain on back with gun 10 inches shorter.
Reviewed By: on 07/04/2017
Rating:     5 of 5 Stars!

if you could afford it in witch is the only problem is the price but it is awesome to shoot and I cant le it makes you feel like a bad ass just holding it but it says that all the tools u need come with it and they mostly do except for the tool u need to get the cylinder off the pump other than that its great
Reviewed By: on 06/07/2017
Rating:     4 of 5 Stars!

After I worked the bugs out , I ended up with a really great product. It was difficult to assemble. the instructions were very good , but the fit was just slightly off and it took a little bit of work to assemble. The first trip to the range was great fired flawlessly. Second trip was a different story. Fired great from the shoulder . Would not fire from the hip at all. The safety connector ( or whatever they call it ) is attached to the buttplate. There was too much play in it and as long as my shoulder was pressing the buttplate foreward it would fire. Without the pressure , no fire.I ended up putting a small screw connecting the buttplate to the stock . Problem Solved . I have hundreds of rounds through it now and it works every time. Great fun.
Reviewed By: on 05/18/2017
Rating:     5 of 5 Stars!

i actually bought this conversion kit for a IAC Hawk 942. it fit with minor alteration. had to file the front top half with a flat file at a 35 degree angle to accommodate the rifle sight welded to the barrel. i also had to cut about a half inch out of the center top of the ring you put on the front to secure the upper and lower half. after putting it together, it is solid without issue and very sturdy. great stock for a Remington 870 clone with minor alteration. only thing i found to be somewhat a issue is the trigger bar. if you do not pay attention when putting the stock together it will slip out of position and become unusable. only way to reset it is to tear it down and put it back together. other than that, no issue that cannot be solved for a clone that it was not meant to go on.
Reviewed By: on 03/04/2017
Rating:     5 of 5 Stars!

Love this it is so cool . Added magpul forend grip & magpul mbus sights also used Remington breached barrel. Very happy you must cycle it like you mean it . Buds people are very nice .thanks .live free & proud .
Questions & Answers
    • Answered
    The stock probably would work, as would the pistol grip, but the barrel of a 20ga is going to have a different outer diameter then that of a 12ga and that would cause fitment issues. Might try something like this --- Or this --------
    See 3 more answers |
    • Answered
    Hi, It is still POSSIBLE to side saddle. I have seen people putting rail mount side-saddle on front rail or the top rail (which extends to the side). You can look it up. Some are more DIY side saddle. I hope this helps.
    See 1 more answer |
    • Answered
    Jayson, yes Sir. The H&R Pardner is an 870 clone essentially.
    See 1 more answer |
    • Answered
    Hi Tim, the description says this kit includes a : Rugged shell deflector for left handed shooters. (With the shell deflector that is on the unit it is left hand shooter friendly.) It also lists a Bull pup Conversion Specialist for any questions at : 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 - - preferred method.
    See 2 more answers |
    • Answered
    look at where the gun ejects and think about where your face would be on the stock. I have no doubt that (with a normal shooting position) it would eject into your face or just miss it
    See 3 more answers |
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