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1/16/2012 9:10:45 PM EDT
So I am back into ar ownersip after a 6 mo. Absence. I just acquired a stag 7 hunter 6.8 spc. My goal is a dual purpose gun with 2 uppers. I have my spr well on its way but I am one for simplicity and I want my sbr to run on the same lower. Apart from the obvious legal requirements is there anything that would keep this from working? I like the idea of one gun with a 30 second swap between close/mid range and mid/long range. Anything like hammer type, buffer tube (7.5 or 10.5" barrel) or anything else that would keep a sbr 5.56 upper from working as a drop in? My local nfa dealer said it would be no prob legally to register my existing stag lower as sbr for use with a 5.56 sbr upper...true? Thanks all
1/17/2012 12:09:30 AM EDT
[#1]
If you want a great performing round through the SBR, stick with 6point8....

Registering your lower on a Form 1 is easy.
Fill out the PDF here.
Duplicates, Front and Back.
A copy of the Certificate of Compliance
Revocable Living Trust, or CLEO signature, photos, and fingerprint cards.
Check to Department of the Justice for $200 (or BATFE)

A 10.5" weapon will give you an OAL of about 27" depending on the muzzle device and chosen stock.  You'll write in on the Form 1 29.5" for a 10.5" weapon.

A 7.5" 5.56 will run, but ballistically it's very inefficient and loud.  Something like the LWRC PSD in 6.8 is ideal since you have additional bore to push a bullet downrange.  6.8s run very well through SBRs.

Good luck and HTH.
1/17/2012 6:23:40 PM EDT
[#2]
Thanks for the advice. I'm going to 5.56 for the sbr so I can shoot more. Or I might do 9mm.... I was reading about needing a certain type of hammer for a 9mm upper to function properly... Can anyone shed light on whether a stag 7 trigger will work with a 9 mm upper?
1/17/2012 7:58:07 PM EDT
[#3]
Quoted:
If you want a great performing round through the SBR, stick with 6point8....

Registering your lower on a Form 1 is easy.
Fill out the PDF here.
Duplicates, Front and Back.
A copy of the Certificate of Compliance
Revocable Living Trust, or CLEO signature, photos, and fingerprint cards.
Check to Department of the Justice for $200 (or BATFE)

A 10.5" weapon will give you an OAL of about 27" depending on the muzzle device and chosen stock.  You'll write in on the Form 1 29.5" for a 10.5" weapon.

A 7.5" 5.56 will run, but ballistically it's very inefficient and loud.  Something like the LWRC PSD in 6.8 is ideal since you have additional bore to push a bullet downrange.  6.8s run very well through SBRs.

Good luck and HTH.


That certificate of compliance that's the first time I herad of this I getting ready to send in my paper work the end of the month

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