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  #1  
Old 03-12-2012, 11:31 PM
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kel-tec-innovations kel-tec-innovations is offline
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Talking Updated* Alternative: Tired of waiting for Kel-Tec KSG ! Mossberg Bullpup Mods

Before Kel-Tec came up with the KSG I have always been eyeballing the Mossberg Bullpup shotgun for the longest time. The mossberg bullpup is a collectors guns and isn't often seen for sell.

Being a fan of Kel-Tec and owning the Kel-Tec RFB and 2 Sub2K .40S&W I knew their production would be slow. Even current production line are not met such as Sub 2000 or RFB.

When I first heard that Turners were taking "Pre-Order" I laughed when they said it will be available by August 2011. I know those poor guys who did deposit pre-order won't see it for 2+ years

So here was my alternative while waiting for the KSG. As the KSG started popping out on gunbroker a large amount of mossberg bullpup became available at a great price $400-$500.

December 2011
I started off with the Mossberg 500 bullpup from gun broker $450 shipped









After receiving the bullpup couple problems I noticed.

1. The 500 only held about 4 rounds
2. Its VERY heavy (thick plastics) ~10lbs.
3. Trigger was sloppy, alot of play and sponge
4. The grip safety sucked and strange
5. The forward vertical grip I really dislike it, wasn't natural angle


Feb. 2012
1. Capacity
To increase capacity I had a Mossberg 590 (8+1rds) laying around I stopped using due to front heavy weight and length(training 8 hours straight at a shotgun course I got tired of it and went with pistol gripped mossberg 500) The bullpup will help balance the weight and shorten the gun OAL



Last edited by kel-tec-innovations; 10-08-2012 at 1:08 AM..
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Old 03-12-2012, 11:32 PM
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2. The Weight

The Bullpup body was over kill in reinforcement and thickness. The Mossberg shotgun is very robust and the thick body is not necessary. I decided to drill some lightening holes. The weight was considerably lighter and looks way cooler. "but but but the dirt would get in......" its no different because the 590 is still fully assembled and just a body slapped over the very reliable 590. If any dirt or mud goes in, it would just fall back out the other holes.



The Trigger was sold chunk of metal, felt like a pound, so drilled holes in it also.



3. Sloppy Trigger 4. Safeties 5. Forward Vertical Grip
No pictures for this. On the trigger linkage there was alot of play, luckily there adjustments. Some shims and adjustments and polishing linkage made the trigger the same as if I was pressing the trigger without the bullpup. No play

The safety has alot of springs, detentes and weight adding parts. Those were removed and the grip safety flopped around without the springs so it was glued in place. This also helped with the trigger smoothness.

The forward grip was removed and the forend trimmed to accommodate the 590 bayonet lugs






March 2012

So far I'm loving it. The weight is very manageable and BALANCED. The once front heavy LONG Mossberg 590 is now balanced 50/50 at the pistol grip and under 31 inches!

Hope you guys enjoyed


More updates coming soon!!

Next mods
1. Installed rails and Magpul AFG2 on the forend
2. Counter sink to clean up the lightening holes on the body
3. Paint the body
4. Possibly add shell carriers
5. Single Point sling attachment point

Last edited by kel-tec-innovations; 10-08-2012 at 1:13 AM..
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  #3  
Old 03-12-2012, 11:42 PM
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WOW, great build! How's it shoot?
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Old 03-13-2012, 12:47 AM
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Quote:
Originally Posted by SOCAL INFIDEL View Post
WOW, great build! How's it shoot?
Shoots great! Well balanced, transition from target to target with ease without the front weight swinging around. Overall fatigue is reduced. The performance in close quarters are improved with the reduced length. The only thing I miss is the Black Hawk Knoxx Stock. Only if I could some how incorporate that in.
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Old 03-13-2012, 6:14 AM
compulsivegunbuyer compulsivegunbuyer is online now
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The next thing I would do is fill all the holes with Chia Pet seeds
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Old 04-17-2012, 4:09 PM
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Default New Bull Pup Owner

What rail did you go with on the heat sheild? love what you did! ANY new pics? I know what you mean about the trigger pull and weight. I was thinking i would Fab a warhammer style heatsheild on to mine, but once i get to cutting- mounting options start to run out.
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Old 04-17-2012, 5:33 PM
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Always fun to read about mods, great job.
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Old 04-17-2012, 6:28 PM
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Stop larking around with your mossy go trade it in and get yourself a real shotgun .....Remington 870 police magnum should fit the bill
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Old 04-17-2012, 7:42 PM
scglock scglock is offline
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looks like you had your sights on backwards in those first couple pics but realized it later lol interesting project.. how much does it weigh?
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  #10  
Old 04-17-2012, 8:49 PM
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That looks like a great HD gun. Now I gotta find a way to do that to my 590, as my search on bullpup stocks turned up nil.
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  #11  
Old 04-17-2012, 10:36 PM
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Nice work but you do realize that we will all be forever required to call your baby "the Swiss Cheese Gun"?
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  #12  
Old 04-17-2012, 11:04 PM
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Holy crap that's awesome!
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  #13  
Old 10-08-2012, 1:01 AM
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Talking Update

Update

Its been a while, a member asked for updates so I'm reviving the thread.

So the update, Rail added under foregrip. Then AFG2 was added. I currently like the looks so haven't decided to paint it yet, but if I do change the colors it would be two tone probably the black replaced with desert tan and leave grip area black. Any suggestions? getting the paint to look right in all the drilled hole

Factory Mossberg 590SP 8+1
7.25lbs


Stock Bullpup mossberg 500

~10lbs (source:gunbroker forum) Let me know if you know the actual weight, can't seem to find it online


Lighten Bullpup with 590sp plain
9lbs 1oz.


Lighten Bullpup with 590sp accessorized ( red dot, front sight w/mount, rear sight, AFG fore grip with rail)
10lbs 2 oz.

Overall the holes drilled really lighten the body of the bullpup, considering the body is old school polyurethane which is very heavy and thick and the trigger was a solid heavy chunk of metal..

Even though its 10lbs its very well balanced in weight.

I can hold it up with one hand fully extended for a while without too much strain, only the barrel of the weight is in front of the web from of my hand, which i'm only holding up 19 inch of the barrel and the weight in the rear helps balance it.

With the stock 590 SP holding the 7lbs fully extended with all metal pass the web of my hand which is 29.5inches of hanging weight with no rear weight which puts massive strain on my wrist.

This test might not mean much to bench and plinkers. I took a 8 hour shotgun course with the 590SP felt like my wrist was going to break. Also the swinging weight, doing clears in CQB less swing radius, recoil fllip reduction. Overall I find more pros with the current set up on my 590SP.

Without scope, using flip up sights



Scoped



Last edited by kel-tec-innovations; 10-08-2012 at 1:22 AM..
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  #14  
Old 10-10-2012, 7:53 AM
brptrailrider brptrailrider is offline
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Thanks for providing the update I requested. This is great info.

I weighed my bullpup on a postal scale and it is 9 lbs 0.0 oz. It is completely stock except the forward pistol grip was removed many years ago and I can't find it to weigh it. My Mossberg 500A Mariner 8+1 with Streamlight TLR-1 and Blackhawk Comp Stock comes in at 7 lbs 4.2 oz.

Great job. I really like what you have done.

I would appreciate it if you could provide any more information on the adjustment and shimming of the trigger linkage and the changes to the safety. IMO this is the worst part of the bullpup and if it can be fixed then the higher capacity 500 will go in and if I can grow some bigger balls then I'll Swiss cheese it like you did.

Thanks again.
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  #15  
Old 03-13-2013, 5:48 PM
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This is freakin amazing. Can i shoot it? Im serious. We need to go to the range together! Ammo is on me!
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