School me on building the .300 Blackout

Markp · Dec 30, 2011

What do I need to look out for?

Any suggestions... I already have a 16" carbine length barrel on the way.

What other differences exist between this and 5.56 uppers?

sailskidrive · Dec 30, 2011

Cool

Where did you order it from? For practicality sake, I have a feeling this is going to kill the 6.8.

I want one too, hopefully more manufacturered will start producing ammo for it.

erwos · Dec 30, 2011

No other differences, IIRC. A big selling point of .300AAC is that you use the same BCG and mags are you would with .223.

BradMacc82 · Dec 30, 2011

Markp said:
What other differences exist between this and 5.56 uppers?

As I understand it, none.

You got the barrel, get to building.

CrabbyMcNab · Dec 30, 2011

The only problem I am having, mind you I have only put together two AR's, is the barrel nut.

I get a barrel, have the gas block pinned on for a 14.5, which means that I have to buy a second barrel nut to have for the second barrel.

I think I will go by way of second complete upper, if funds are available.

I agree, all the rage is Blackout, 6.8 is out the door.

Markp · Dec 30, 2011

sailskidrive said:
Where did you order it from? For practicality sake, I have a feeling this is going to kill the 6.8.

I want one too, hopefully more manufacturered will start producing ammo for it.

Midway. I went with the SI defense. It has good reviews (other than the gas port which is left undersized for tuning reasons).

$177 shipped.

As far as the barrel nut, ya, you'll need another one. I plan to build a dedicated upper.

TROOPER · Dec 30, 2011

You need a stripped upper receiver?

I have a brand new Spikes Upper I'm not going to be using.

And a Vortex StrikeFire Red-Dot, I'll be adding them to the classified sections at the weekend.

clandestine · Dec 30, 2011

sailskidrive said:
Where did you order it from? For practicality sake, I have a feeling this is going to kill the 6.8.

I want one too, hopefully more manufacturered will start producing ammo for it.

I hope the 300 Blackout kills the "six eight short penis compensating", as well.

Jimbob2.0 · Dec 30, 2011

I wish I hadn't missed out on cdnns cmmg special purchase really cheap uppers. No bolt but barrel and receiver mated at around 300 with a railed gas lock.

drew_acid · Dec 31, 2011

sailskidrive said:
Where did you order it from? For practicality sake, I have a feeling this is going to kill the 6.8.

I want one too, hopefully more manufacturered will start producing ammo for it.

Agreed - This may very well kill the 6.8. I have a 6.8 and very much like it.

My concern also is ammo - both can be be difficult to find or afford....

platekiller · Dec 31, 2011

CrabbyMcNab said:
The only problem I am having, mind you I have only put together two AR's, is the barrel nut.

I get a barrel, have the gas block pinned on for a 14.5, which means that I have to buy a second barrel nut to have for the second barrel.

I think I will go by way of second complete upper, if funds are available.

I agree, all the rage is Blackout, 6.8 is out the door.

If you need a barrel nut, let me know. I have one from a project that fell through. The 300 blackout is so cool. Maybe one of these days I'll get one.

Markp · Dec 31, 2011

drew_acid said:
Agreed - This may very well kill the 6.8. I have a 6.8 and very much like it.

My concern also is ammo - both can be be difficult to find or afford....

This is easy to reload.... Ammo made from standard .223 with .308 bullets.

Markp · Dec 31, 2011

So this is where I am going on my .300 blackout basic build.

R-Guns NiB Bolt Carrier and NiB Upper
Daniel Defense LPK
SI Defense Barrel
PSA Lower
SI Defense Adjustable Gas Block
Fully Floated handguard/barrel.

Still need to pick out a buttstock...

Russ D · Dec 31, 2011

Markp said:
So this is where I am going on my .300 blackout basic build.

R-Guns NiB Bolt Carrier and NiB Upper
Daniel Defense LPK
SI Defense Barrel
PSA Lower
SI Defense Adjustable Gas Block
Fully Floated handguard/barrel.

Still need to pick out a buttstock...

I have not heard a single good thing about that barrel.

atblis · Dec 31, 2011

The Stoner barrel gets decent reviews. I seem to remember reading that it's more or less the same barrel that Wilson Combat is selling.

DSA has an upper for $320 (-bolt/ch). I have one and it seems decent so far. Supposedly they're planning to start selling the barrels separate.

Markp · Dec 31, 2011

Russ D said:
I have not heard a single good thing about that barrel.

At least one poster on Snipers Hide is reporting sub MOA out of it. Others report it to be accurate as well... It does need the gas hole opened up which is a fair criticism... but an annoyance that does not concern me (I'll save the $30 and put it elsewhere).

What have you heard bad about it?

I looked at a number of possibilities, the AR-Stoner was out of stock, the CMMG was only available with a pistol length gas system.

Mark

Russ D · Dec 31, 2011

Markp said:
At least Poster on Snipers Hide is reporting sub MOA out of it. Others report it to be accurate as well... It does need the gas hole opened up which is a fair criticism... but an annoyance that does not concern me (I'll save the $30 and put it elsewhere).

What have you heard bad about it?

I looked at a number of possibilities, the AR-Stoner was out of stock, the CMMG was only available with a pistol length gas system.

Mark

If you are comfortable opening the gas port then I guess you are GTG.

mayor_quimby · Dec 31, 2011

Don't want to thread jack but what about the barrel from CMMG ?

http://cmmginc.secure-mall.com/item/M300-Contour-300-AAC-BLACKOUT-Barrel-1709

Markp · Dec 31, 2011

mayor_quimby said:
Don't want to thread jack but what about the barrel from CMMG ?

http://cmmginc.secure-mall.com/item/M300-Contour-300-AAC-BLACKOUT-Barrel-1709

It was out of stock at midway, didn't think to check on CMMG's site. I think the SI and CMMG are about equal to be honest. There were some early problems with the CMMG barrel with the chambering from what I read.

With regard to the gas port... ya, I have my own mill and lathe. Not an issue to open up the gas port a little.

Good input.... I think CMMG is good to go now as well. I would have considered it, but I'll save 30 bucks using my mill.

Semper Noctem · Jan 1, 2012

clandestine said:
I hope the 300 Blackout kills the "six eight short penis compensating", as well.

And que Forest... now:

School me on building the .300 Blackout

The #1 community for Gun Owners of the Northeast

Member Benefits:

Ultimate Member

Legalize the Constitution

The Hebrew Hammer

Ultimate Member

Ultimate Member

Ultimate Member

Ultimate Member

AR-15 Savant

Ultimate Member

Kreuzritter

Ultimate Member

Ultimate Member

Ultimate Member

Ultimate Member

Ultimate Member

Ultimate Member

Ultimate Member

4+4= Jello

Ultimate Member

Desk Rabbit

Users who are viewing this thread

Log in

Forum statistics