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1/22/2020 12:12:56 PM
Posted: 10/3/2007 8:48:24 AM EST
[Last Edit: 10/3/2007 8:48:24 AM EST by Lancelot]
I just sold an AR to a friend that has a gov profile 14.5" bbl and is interested in mounting a shotgun in the M203 position......I dont know the first thing about this at all. Is it possible, do they make specific mounts......and what shotgun would be used?


Any links would be appreciated too. Thanks
Link Posted: 10/2/2007 10:29:01 AM EST
I dont know if they are available to civies but the Knights Masterkey is one way.
Link Posted: 10/2/2007 10:37:22 AM EST
[Last Edit: 10/2/2007 10:40:51 AM EST by DMR]
Sage also makes a mount:
Interbar Platform System

For "COOL" factor it might be good, but it is useless for a fighting/duty weapon. Basicly you make both weapons less then they are by them selves. Most organizations that have gone down this path have ended up removing them, but it keeps being "Re-discovered" every few years when the old timers move on.

There is one solution possible, but I haven't made it yet and that's because I'm not sure it is worth the trouble for the SMALL advantage you would gain. The approuch is simple, but I don't believe it has ever been done. SInce I still might do it I won't elaborate
Link Posted: 10/2/2007 11:25:18 AM EST
Just a reminder to your friend, follow the NFA rules.
Link Posted: 10/2/2007 11:27:57 AM EST
[Last Edit: 10/2/2007 11:28:48 AM EST by Dragonfly228]
shotguns must have a minimum of 18" barrels unless you register it as a SBR

Link Posted: 10/2/2007 11:33:18 AM EST
[Last Edit: 10/2/2007 11:34:35 AM EST by CAR-AR-M16]

Originally Posted By Dragonfly228:
shotguns must have a minimum of 18" barrels unless you register it as a SBR


Must be registered as an SBS not SBR.

SBR = Rifle wirh barrel less than 16"
SBS = Shotgun wirh barrel less than 18"
Link Posted: 10/2/2007 11:36:44 AM EST

Originally Posted By CAR-AR-M16:

Originally Posted By Dragonfly228:
shotguns must have a minimum of 18" barrels unless you register it as a SBR


Must be registered as an SBS not SBR.

SBR = Rifle wirh barrel less than 16"
SBS = Shotgun wirh barrel less than 18"


I stand corrected.
Link Posted: 10/2/2007 3:45:20 PM EST
the main advantage for this set-up is as a breaching weapon. hence knight's calling it "masterkey", you can open any door with it. sure wouldn't be very good for skeet.
Link Posted: 10/3/2007 8:35:55 AM EST
I remember Vollmer or Ciener was selling the mount kit for a Rem 870 under a 20" about fifteen years back as the "Witness Protection Model".

We just bungee-corded our little breaching shotguns behind us and fought with our M4s.
Link Posted: 10/3/2007 9:13:55 AM EST

Originally Posted By Dragonfly228:
shotguns must have a minimum of 18" barrels unless you register it as a SBR

www.arniesairsoft.co.uk/projects/scifi/billym16.jpg


So is the above setup legal w/ NO additional paperwork?
Link Posted: 10/3/2007 11:21:46 AM EST
[Last Edit: 10/3/2007 11:24:14 AM EST by AWDTerror]
why?
I guess it could be..
Link Posted: 10/3/2007 1:57:07 PM EST

Originally Posted By AWDTerror:
why?
I guess it could be..



Thats just what he wants.....maybe to look cool? I dont know, I'm just trying to help him find the proper stuff for the setup he wants.
Link Posted: 10/8/2007 9:57:36 AM EST
Don't forget that in addition to barrel length, you must have a certain overall length. It would be open to interpretation if the "mothership" carrying the shotty counted in the length, especially if the shotgun portion could be easily removed.
Link Posted: 10/8/2007 10:13:14 AM EST
Link Posted: 10/8/2007 12:30:38 PM EST
Correct!

Under the NFA, a shotgun with a barrel length of less than 18" (or an overall length less than 26") is a "short barreled shotgun".

Since the usual Remington 870 shotgun barrel is 18" and the shotgun itself is about 25.5" without the stock, the Tacstar shorty grip replacement will allow U to remove the stock and safely keep it a legal NON-NFA length. Or U can SBS it via ATF.
Link Posted: 10/8/2007 12:34:59 PM EST
[Last Edit: 10/8/2007 12:37:35 PM EST by ar15pistolero]
It must be a heavy setup!
Link Posted: 10/8/2007 12:38:38 PM EST
height=8
Originally Posted By AWDTerror:
why?
I guess it could be..


Additionally to the barrel length, the shotgun length should be 26" or more if it's not registered as an SBS.
There might be other requirements to install it in the bottom of the AR15 but I'm not sure.
Link Posted: 10/8/2007 6:54:39 PM EST
I believe the Master Key is registered as an AOW, which is an added plus.
Link Posted: 10/9/2007 5:11:11 AM EST
Link Posted: 10/9/2007 1:38:33 PM EST

Originally Posted By BTripp:
I believe the Master Key is registered as an AOW, which is an added plus.


KAC Masterkey is registerd as an SBS, not an AOW.
Link Posted: 10/10/2007 7:21:58 AM EST
Remington also makes a complete 870 kit with a rail adapter for mounting under an M4.

Yes, as soon as you mount a AOW to a shoulder fired weapon it "becomes" an SBS by definition.

WAY more trouble than it's worth. It's MUCH better to have a separate breaching shotgun.
Link Posted: 10/10/2007 8:13:48 AM EST

Originally Posted By LoneWolfUSMC:
Remington also makes a complete 870 kit with a rail adapter for mounting under an M4.

Yes, as soon as you mount a AOW to a shoulder fired weapon it "becomes" an SBS by definition.

WAY more trouble than it's worth. It's MUCH better to have a separate breaching shotgun.
Link Posted: 10/11/2007 10:31:10 AM EST
[Last Edit: 10/15/2007 6:12:50 PM EST by TRWalsh]

Originally Posted By azhammer:
I just sold an AR to a friend that has a gov profile 14.5" bbl...


Also, he'll have to get his barrel modified to add the M203 step-down notch. The KAC masterkey uses a standard M203 mounting system that clamps to the barrel. No big deal though, many guys who work on barrels offer this service.

www.knightarmco.com/m203_12ga.html
Link Posted: 10/11/2007 1:10:50 PM EST
How about a Pistol AR with a serbu shorty bolted on? Still AOW?
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