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


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Arizona_Mike
September 8, 2013, 06:13 PM
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

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aubie515
September 10, 2013, 09:00 PM
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.

Arizona_Mike
September 10, 2013, 10:58 PM
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

Telekinesis
September 10, 2013, 11:30 PM
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.

Arizona_Mike
September 11, 2013, 01:23 PM
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.
. . . one would normally not run the cheapest gasoline in a high end car, but it will still run. These barrels will generally shoot any round, but you'll get the best performance out of match ammo.

My reply to that reply included:
Actually the question about cast bullets was not about inexpensive bullets but about hardcast alloy bullets with copper gas checks sorted by precise weight. I didn't bother to mention sorting my cases, reaming my primer pockets, and turning my necks . . .

Mike

wally
September 11, 2013, 06:06 PM
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.

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.

SuedePflow
October 31, 2013, 11:02 AM
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?

Aaron Baker
October 31, 2013, 05:34 PM
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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