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Going to do one more Form 1 (300BLK barrel recomenation).

Discussion in 'NFA Firearms and Accessories' started by Arizona_Mike, Sep 8, 2013.

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  1. Arizona_Mike

    Arizona_Mike Member

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    With all the trust stuff being proposed I'm going to get off the fence and pull the trigger one or two Form 1s to add to the 3 I have pending since Feb.

    One is an AR. Since it will likely take more than a year, I don't want to buy the parts now but I need to know what barrel I will go with for the barrel length and OAL on the form.

    What is a good choice for a mostly subsonic gun 1:8 or 1:7 since non-subsonic use will probably be moderate range? I do want it to be gassed heavy enough to cycle without a supressor so I think Noveske is out. If the From 1 takes too long and I do get the parts, I may slap a pistol lower and a SB-15 "grip" on a A2 tube with a spacer, so I'd want something that results in a "firearm" length of 26" so I am not limited in my foregrip choices. I am currently using the SB-15 as a stopgap on another Form 1 from January but I am hopeful I will see that stamp in the next 6-8 weeks since I just sent back a correction 6 days ago.

    Mike
     
  2. aubie515

    aubie515 Member

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    Dang, dude a bit long winded?

    From your ramblings, I'd say either the 1:7 or 1:8 twist would serve you for subsonic shooting. The 1:7 will help if you are considering shooting 245gr cast bullets.
     
  3. Arizona_Mike

    Arizona_Mike Member

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    I appologise for forcing you to read six whole sentences but thanks for the feedback. Do you have a brand recomendation this will work with all 4 combinations of supersonic/subsonic, and supressed/unsupressed.

    Mike
     
  4. Telekinesis

    Telekinesis Member

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    Haha if you think the OP is long winded, you'll hate some of my posts! :D

    I have a .300 Blk SBR, but I haven't been able to find any ammo for it since I finished building it so I'm not sure how much of a real recommendation I can give. I went with a 10.5" AR-Stoner barrel (Midway house brand). I would probably recommend a 1:7 twist if you're planning on using subs, though both 1:7 and 1:8 should be fine for supersonic ammo as well.

    I have also heard good things about CMMG barrels, but I wouldn't be adverse to a AAC barrel (though I do think they're a little pricy).

    For what it's worth, if I could do it again I'd probably register my SBR in .223 and just have a second upper for it in .300 Blk. That way I'd be sure that I could find ammo to put through the gun.
     
  5. Arizona_Mike

    Arizona_Mike Member

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    Well, I just submitted the Form 1 with a 10.5 inch barrel (Rainier Match, Select, or UltraMatch) -- Will make up my mind which one later.

    I sent them a question about cast bullets in their Select Barrel (polygonal rifling) and got back a bizarre answer.
    My reply to that reply included:
    I didn't bother to mention sorting my cases, reaming my primer pockets, and turning my necks . . .

    Mike
     
  6. wally

    wally Member

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    No reason you can't do it in the opposite order and have a second 5.56 upper for your .300Blk.

    Add in a .22LR conversion kit and you can have three calibers to try and find.
     
  7. SuedePflow

    SuedePflow Member

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    I'm filling out an electronic Form 1 for the first time right now and I have questions regarding barrel length.


    Regarding #4e; I haven't bought the barrel yet. I figured I have 6+ months to decide on which one to buy anyway. It's probably going to be in the 9-10.5" range. Should I just guess/estimate a length?

    Regarding #4f; How could I possibly know the exact overall length of a gun that I'm not yet allowed to legally assemble? Let alone with a can installed that I don't even have possession of yet... Again, do I just estimate a length?
     
  8. Aaron Baker

    Aaron Baker Member

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    Suede:

    The barrel length is something you need to put on the form. However, once you have the tax stamp in hand, if you choose a different barrel length, you can just notify the ATF of the "permanent change" to the firearm by sending them a letter. So just pick a length now and go with it. They want to know a length, but once the firearm is a registered SBR, it can have any length barrel, legally.

    As for the overall length, you should be able to make a fairly good estimate. If it's an AR15, there's lot of info out there. You measure with the stock fully extended, by the way. So if you choose a 10.5" barrel and plan to use a collapsible stock, just find a maker with a comparable gun that lists the overall length spec and use that data.

    You do NOT need to list the length with the detachable suppressor included. That's a separate, removable muzzle device and doesn't count towards overall length. If it was a permanently attached suppressor, it'd probably bring the length above 16" anyway, and you wouldn't need the SBR stamp.

    Aaron
     
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