Have to say that is the best looking pony gun I have ever seen....
time to get Redi mag for that AR. 
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So here's a question - seeing as now its a registered full-auto lower as well as an SBR - did you have to get that Colt lower engraved (or was it purchased as an SBR/Full auto so it just required a Form 4)?
I'm certainly jealous man - very nice gun.
I'm certainly jealous man - very nice gun.
Thanks for all the compliments guys (and constructive criticism).
This is a registered reciever lower on a Form 4, rather than an RDIAS or Lightning Link, so no engraving required for using an SBR upper. I'm not sure whether a host lower is required to be engraved, as I never looked at that route. Perhaps some of our resident SME's in that area could chime in?
It is a machinegun, not a rifle.
Rifles have a barrel restriction of 16". Anything under 16" must be registered as an SBR.
Machineguns have no barrel restrictions at all. You can use any length barrel you want without any additional registration.
What about RDIAS and Lightning Links? Since the host lower is not the NFA item, does it need to be SBR registered to use a barrel shorter than 16"?
thats awesome.
Yes and No.
If you plan on leaving the RDIAS/LL in the host receiver all of the time, then the host receiver is a machinegun and would not require registration as an SBR.
If you plan on moving the RDIAS or LL between multiple host receivers then you would need to SBR register whichever receiver would still have a <16" barrel while the device is in another receiver.
Another thing to remember is that you cannot leave the M16 FCG parts in the lower when you move the RDIAS to another receiver. You cannot have multiple M16 FCG parts with only 1 RDIAS. This is not an issue for LL's since they work off of the standard AR-15 FCG parts.
HTH
