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3morereps
Illinois Fan
The Gym
Member since Jun 2015
4517 posts

AR 15 300 blackout pistol build
Anyone built one of these puppies?

I've never shot the round, but i just watched a shite load of youtube videos on it; and it sounds like a great round for an sbr, oh i mean pistol haha.

I am looking at the kak shockwave "brace" on a spikes lower that ive had for awhile and just buying a bcm 9" complete upper.
This post was edited on 3/1 at 10:42 pm


jimbeam
USA Fan
University of LSU
Member since Oct 2011
50288 posts

re: AR 15 300 blackout pistol build
Seriously considering one as well


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11
bapple
LSU Fan
Capital City
Member since Oct 2010
10617 posts

re: AR 15 300 blackout pistol build
Do you plan to suppress or reload for it?

I honestly think the 300BLK craze may come and go but hopefully it sticks. It’s a great round to suppress but at suppressed velocities it’s basically a very long 45 ACP bullet. Not to say it can’t place an accurate shot but that your effective range is quite short compared to the supersonic ones or just plain ole 5.56.


ChatRabbit77
Baton Rouge
Member since May 2013
4776 posts

re: AR 15 300 blackout pistol build
Only point of .300 blk is short and suppressed. Don't buy it if you don't plan to suppress it. If you don't plan on getting a silencer, buy a 6.5 grendel pistol upper if you want something short and deadly.


3morereps
Illinois Fan
The Gym
Member since Jun 2015
4517 posts

re: AR 15 300 blackout pistol build
Cant suppress in Illinois, will be reloading & using it for fun and home defense. I have so many home defense guns. It is my go to when my wife asks why i got another gun.


3morereps
Illinois Fan
The Gym
Member since Jun 2015
4517 posts

re: AR 15 300 blackout pistol build
Will be 9", per my due diligence there is no increase in velocity after that length


ChatRabbit77
Baton Rouge
Member since May 2013
4776 posts

re: AR 15 300 blackout pistol build
quote:

per my due diligence there is no increase in velocity after that length

Not no increase. It's very negligible though. Also, 6.5 grendel in a 12 to 12.5 inch barrel is a better choice imo if you cant get a can for your gun.


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12
jdavid1
Member since Jan 2014
1557 posts

re: AR 15 300 blackout pistol build
quote:

Cant suppress in Illinois


Well then the 300BLK is pretty much pointless. The whole point of the round is that it cycles a subsonic in a semi auto. If you're not going to run subs through a suppressor then go with another caliber.

I agree with Bapple, I think the 300BLK fad is coming to an end. It got popular with the suppressor craze that's been going on for the last few years. Once that settles down I think people will realize it's a very niche caliber. I know I haven't taken mine out the safe in over a year now.


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11
Fachie
H-Town
Member since Mar 2017
228 posts

re: AR 15 300 blackout pistol build
As stated, unless going suppressed there are better choices. I built one years ago and it lives with an Omega 9K these days. Its a fun, quiet SBR and fills the intended roll very well, but as a "normal guy" shooting it meh. Your parts list is solid.


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00
LSUfreak1459
LSU Fan
Member since Feb 2008
815 posts

re: AR 15 300 blackout pistol build
Go 6.5 grendel if you aren't suppressing. I built a 300blk. I do plan on suppressing it and using it for home defense. Wish I would have gone grendel first. My 300blk just sits in the safe now until I get a suppressor.


Fachie
H-Town
Member since Mar 2017
228 posts

re: AR 15 300 blackout pistol build
Only reason not to shoot would be ammo cost. Take it out and have fun.


Easternrio
LSU Fan
Member since May 2014
3685 posts

re: AR 15 300 blackout pistol build
My 5yr old killed 3 deer with an unsuppressed 16 in 300 blackout this year. It does serve a purpose.


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50
tiddlesmcdiddles
LSU Fan
Lafayette, LA
Member since Apr 2013
1527 posts

re: AR 15 300 blackout pistol build
quote:

I honestly think the 300BLK craze may come and go but hopefully it sticks



i think we are way past that.

5.56 bolt
5.56 magazines
30 cal bullet
hits like a hammer compared to 5.56



I have both 300blk sbr 8.2" barrel (suppressed)

12" 6.5 Grendel pistol (suppressed)

The SB Tactical brace is more comfortable than the Shockwave fyi


300Blk - more plentiful and cheaper ammo options, especially just for plinking

6.5 Grendel- better velocity (not by much though) allowing you to reach out a little bit further than 300blk

this choice is yours, can't really go wrong with either.


jdavid1
Member since Jan 2014
1557 posts

re: AR 15 300 blackout pistol build
quote:

The SB Tactical brace is more comfortable than the Shockwave fyi



This is an understatement. The shockwave is painful to shoot. I'm about to sell mine for a SB.


tiddlesmcdiddles
LSU Fan
Lafayette, LA
Member since Apr 2013
1527 posts

re: AR 15 300 blackout pistol build


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Easternrio
LSU Fan
Member since May 2014
3685 posts

re: AR 15 300 blackout pistol build
The key is not trying to make the 300 blk something it’s not. It is however a great deer gun for young and recoil sensitive hunters. We shoot 110 gr SST and haven’t lost a deer yet with 7 kills.


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30
lsugerberbaby
LSU Fan
baton rouge
Member since Mar 2008
2488 posts

re: AR 15 300 blackout pistol build
quote:

300Blk - more plentiful and cheaper ammo options, especially just for plinking


Define cheap? And where?


Kingpenm3
McNeese State Fan
Xanadu
Member since Aug 2011
6225 posts

re: AR 15 300 blackout pistol build
quote:

build


Hard to justify building them when Primary Arms always has such good deals on full setups. Then change out whatever you want.

Houston company too.

http://www.primaryarms.com/


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00
bbvdd
Alabama Fan
Memphis, TN
Member since Jun 2009
16147 posts

re: AR 15 300 blackout pistol build
quote:

Define cheap? And where?


I think he's saying cheaper than 6.5 grendel


ChatRabbit77
Baton Rouge
Member since May 2013
4776 posts

re: AR 15 300 blackout pistol build
quote:

I think he's saying cheaper than 6.5 grendel

People can get steel cased 6.5 grendel for plinking.


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