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Posted: 10/2/2007 11:29:01 AM EDT
[#1]
I dont know if they are available to civies but the Knights Masterkey is one way.
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Posted: 10/2/2007 11:37:22 AM EDT
[#2]
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 
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Posted: 10/2/2007 12:25:18 PM EDT
[#3]
Just a reminder to your friend, follow the NFA rules.
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Posted: 10/2/2007 12:27:57 PM EDT
[#4]
shotguns must have a minimum of 18" barrels unless you register it as a SBR
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Posted: 10/2/2007 12:33:18 PM EDT
[#5]
Must be registered as an SBS not SBR. SBR = Rifle wirh barrel less than 16" SBS = Shotgun wirh barrel less than 18" |
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Posted: 10/2/2007 12:36:44 PM EDT
[#6]
I stand corrected. |
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Posted: 10/2/2007 4:45:20 PM EDT
[#7]
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.
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Posted: 10/3/2007 9:35:55 AM EDT
[#8]
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. |
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Posted: 10/3/2007 10:13:55 AM EDT
[#9]
So is the above setup legal w/ NO additional paperwork? |
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Posted: 10/3/2007 12:21:46 PM EDT
[#10]
why?
I guess it could be.. |
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Posted: 10/3/2007 2:57:07 PM EDT
[#11]
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. |
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Posted: 10/8/2007 10:57:36 AM EDT
[#12]
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.
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Posted: 10/8/2007 11:13:14 AM EDT
[#13]
If the barrel is 18"+ then detaching it from the AR would be no different than a pistol gripped shotgun would it? |
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Posted: 10/8/2007 1:30:38 PM EDT
[#14]
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. |
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Posted: 10/8/2007 1:34:59 PM EDT
[#15]
It must be a heavy setup!
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Posted: 10/8/2007 1:38:38 PM EDT
[#16]
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. |
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Posted: 10/8/2007 7:54:39 PM EDT
[#17]
I believe the Master Key is registered as an AOW, which is an added plus.
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Posted: 10/9/2007 6:11:11 AM EDT
[#18]
That doesn't help. The minute you bolt a Master Key to an AR it becomes a shoulder-fired shotgun with a buttstock, and that (a) voids the AOW status and (b) makes it an unregistered SBS. 
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Posted: 10/9/2007 2:38:33 PM EDT
[#19]
KAC Masterkey is registerd as an SBS, not an AOW. |
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Posted: 10/10/2007 8:21:58 AM EDT
[#20]
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. |
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Posted: 10/10/2007 9:13:48 AM EDT
[#21]
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Posted: 10/11/2007 11:31:10 AM EDT
[#22]
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 |
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Posted: 10/11/2007 2:10:50 PM EDT
[#23]
How about a Pistol AR with a serbu shorty bolted on? Still AOW?
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