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Author Topic: Bullpup Shotgun build - WARNING - pic heavy!!  (Read 19849 times)
Sgt_P
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« on: May 16, 2010, 07:00:11 PM »

Here's my "write-up" on the mod's to my 12 gauge Bullpup...


Original configuration:
 



Broken down:
 



Ditch the Luggage Handle!!
 


Drill and tap a rail to a new heat shield (don't be shy with the LocTite!):
  
   

Add clamp-on rail for front sight:
 



Ditch the forward grip:
 


Drill and tap the underside of the pump for rail:
  
       
NOTE: The rear and middle are tapped, and spaced with lock washers as to not interfer with the pump tube. The front uses the flat nut that came with one of the rails. LOCTITE!



My option for a front grip is the CAA, so I needed to remove some material to compensate for the angled front of the pump:

 
NOTE: The missing "rib" from the flashlight clamp. DREMEL!


The CAA Grip comes with thumbscrews, but the pump is square, and so the wingnuts were replaced with plain-ole nuts:
 





Note the risers to raise the rear sight, for a better cheek weld.
      
I added some risers to the front sight rail as well, just not pictured...










 


Now, not as ugly, and much more functional sights!!

Semper Fidelis
« Last Edit: May 16, 2010, 07:22:03 PM by Sgt_P » Logged

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Capt L Williams, USMC, WWI (Belleau Wood)
AdvenJack
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« Reply #1 on: July 24, 2010, 10:09:41 PM »

Very good job here!
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Jack
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« Reply #2 on: September 22, 2010, 11:45:43 PM »

Nice!
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ROGUE
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« Reply #3 on: July 10, 2011, 10:08:15 PM »

that is the sweetest Mossberg I've seen.........now i really miss mine!
 
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johnny9
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« Reply #4 on: August 29, 2011, 03:19:45 PM »

went from one ugly mutha,to a sweet looking firearm that i would say can double what price it cost after you got done with it..

great minds think alike Cool
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get r done
Solscud007
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« Reply #5 on: November 29, 2011, 06:01:11 PM »

Sorry for my noobness. Where is the kit from? Im getting a Mossberg 500 off of my friend. I would entertain the idea of making this.
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« Reply #6 on: November 29, 2011, 09:35:09 PM »

It's not a kit.  It's an old mossberg model (based on the 500) offered back in the 90's.

See the first picture with the handle...
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Capt L Williams, USMC, WWI (Belleau Wood)
matildaleon
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« Reply #7 on: December 11, 2011, 02:09:21 PM »

Hey Sgt...i'm curious if this same modification could be done but leave off the front vertical grip handle alltogether? Could it be left "un-handled" so the slide is held more traditionally like a standard shotgun.

Im kinda guessing the answer is yes....but i don't know if the bullpup version of this gun is easily slid traditionally or if you really need a vertical handle to get enough leverage to make it functional......you know what i mean?

Thanks!
GMP
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« Reply #8 on: December 11, 2011, 02:15:09 PM »

It actually feels great like that!

The slide is a little wider/squared-off, than a ordinary shotgun, but the edges are all rounded, so the hand fits, and works the slide nicely!!

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Capt L Williams, USMC, WWI (Belleau Wood)
matildaleon
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« Reply #9 on: December 11, 2011, 02:28:19 PM »

Hey cool thanks.
I wonder if one day in the future you might post more exacting "instructions" with web addresses of the parts you ordered & such other helpful info.
Thanks!
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« Reply #10 on: December 11, 2011, 02:34:55 PM »

It's been a while, but I'll see what I can dig up...

BTW, Welcome!  Thanks for joining The Bullpup site!!
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Capt L Williams, USMC, WWI (Belleau Wood)
johnny9
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« Reply #11 on: December 11, 2011, 02:42:14 PM »

what he said^^^^^^^^^^^^^ welcome to the forum Grin
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« Reply #12 on: December 15, 2011, 12:22:38 AM »

Hello I am new here in fact this is my first post. I love the Mossburg Bullpup, in fact I have 3 of them. Have been wanting to upgrade but am a little worried about taking it apart and putting it back together. Do you know where a manual or some detailed disassembly instructions.
If I can figure this out I will be upgrading! Smiley
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Sgt_P
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« Reply #13 on: December 17, 2011, 01:44:40 PM »

Working on a owners manual...

But in the mean while, here's the schematic from Numrich Gun Parts.



The only tricky part of taking it apart and reassymbling is the grip safety.  There's a spring that can fly!  Other than that it's a simple shell...

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Capt L Williams, USMC, WWI (Belleau Wood)
45gunz
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« Reply #14 on: January 27, 2012, 01:01:43 PM »

no need for parts list--got it all figured out--
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« Reply #15 on: January 27, 2012, 02:25:54 PM »

I expect pictures!!

Watch that spring in the pistol grip saftey when you disassemble!!
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"Retreat, hell we just got here!" 
Capt L Williams, USMC, WWI (Belleau Wood)
VitSports6
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« Reply #16 on: May 24, 2012, 11:20:52 AM »

I keep coming back to this...
I'm curious, What is the length of the forend rail for the front grip? 4" or so?
I am considering changing my BullPup up a little.
Thanks for the info.
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have fun
Brian
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« Reply #17 on: May 24, 2012, 11:38:43 AM »

You're right.  The 4" flat rail piece fit without any modification (other than tapping the plastic for the screws).
I lock-tighted the screws in, and it's like a rock.  I was carefull at first, but now I throw it around by the front handle!

My heat guard, with the long rail tapped in, moves when shooting a bunch.  So I'm looking at a new rail/heat guard...
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Capt L Williams, USMC, WWI (Belleau Wood)
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« Reply #18 on: May 24, 2012, 01:16:49 PM »

 Cool, Thanks, I'm thinking I will pick one up on the way home from work, Thats the reason I didn't measure myself  Grin
 I have been considering the AimSports full length rail for my Bull Pup, Seen here on this 500...

http://www.mossbergowners.com/viewtopic.php?f=125&t=3661&p=45418&hilit=aim+sports#p45418

 I know it looks like it will be a poor fit, But I have a good cnc machine that I should be able to make it fit without changing anything on the Bull Pup stock, Then just add some MBUS front and rear's, Along with the rail I asked about and I may look into a Magpul AFG.
 Thanks again
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Brian
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« Reply #19 on: May 24, 2012, 01:37:27 PM »

I like that full length rail.  If the front clamp is "up against" the mag/barrel lug, then you'll just need to clamp back at the chamber area of the barrel (the old heat sheilds just barely pinch in there).
And if the rail is "sandwiched" between the front mag/barrel lug, and where the barrel engages the receiver, it should leave no room for movement.

Mine is the longer mag tube.  Make two, and I'll pay for the extra one!   Wink
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Capt L Williams, USMC, WWI (Belleau Wood)
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