Building a SBR Updated

there are a few of us on here who have 300blk builds. if you are going to SBR it, then there is no real reason to go ANY longer than 8.5".

i used:

noveske 300blk 8.2" barrel
vltor stripped upper
seekins 12" BAR
PRI Gasbuster Charging handle
AAC SDN-6
Geiselle SSA-E trigger
magpul/ large/ B5 furniture
Night Force 1-4x for an optic

.300blk does not see any major performance gains with longer barrels. Velocity gains are nearly negligible for how much extra barrel you add. The rifle is meant to have a short barrel for this reason, keeping it shorter than 8.5 will give you awesome performance in a small as possible package.

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what is the reason for this? what is magical about 8.5"?

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in addition to what Chat mentioned, because of the rounds design, it burns all of its powder within 9" so you don't gain any velocity from a longer barrel

8.2" Noveske Barrel (current production is an 8.5")
Vltor stripped upper
LMT FA bcg
Raptor charging handle (although thinking of giving the gas buster a try)
Spikes lower
ALG ACT trigger
7" SLR solo hand guard
Outfitted with Magpul/B5 grey handle/grip/stock (concrete jungle type stuff )
Specwar 7.62 suppressor
And just upgraded to a JP silent buffer system (is so freaking legit)

Welcome to the SBR club.

Thanks for the info gentlemen. I've been told to go 10" or less on the barrel so I am already leaning towards the short as possible route.

How do you like that aac can?

Thanks for the silent buffer tip. Just added it to my list of parts.

I'm pretty pumped up about this. I have several guns (a lot were lost in a boating accident unfortunately though) but nothing with a tax stamp. I plan on having at least 4 in the next few months.

What's the process to get the lower engraved and getting the form 1 going?

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How do you like that aac can?

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no qualms with it. it does as designed and is easy to take off, even under the rail (just need a pencil or pointy object to stick through.)
your sandstorm would be a breeze if you were looking to go under the rail with your can.

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Thanks for the silent buffer tip

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it makes quite a difference in what the shooter and especially people around you will hear, as the action makes most of the noise.

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What's the process to get the lower engraved and getting the form 1 going?

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if your trust is set up then go register on e-forms online, and once you are set on a barrel length and have a lower picked out go submit that biotch.

this link is helpful with each step on what to do:
e-forms for dummies

as far as getting your lower engraved, I am unsure on where to point you. I was fortunate enough to have a family business that took care of it for me. but make sure you get the font size and engraving depth requirements before you bring it to someone. I believe most people just send them off to companies who specialize in AR's and know the requirements. maybe C-Rabbit or LSUMMW could help out here.

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How do you like that aac can?

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Look into a Saker or the new Silenceo Omega. The AAC sdn 6 is a good oNE as well.

I've almost got my heart set on the sandstorm. I keep hearing that it's supposed to be one of the more accurate ones in 30 caliber.

The measurements I am getting have the samson evolution keymod allowing enough room for the sandstorm to fit in. I could easily be wrong though.

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And just upgraded to a JP silent buffer system (is so freaking legit)

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How's it work for non-suppressed ARs? I would imagine it lessens vibrations and noise with your cheek on the buffer tube quite a bit.