7.5inch pdw, 556 or 300aac?

[Suputin]

The .300 Black out was designed specifically for suppression you will notice than even rifles 16" chambered in .300 BO have carbine or even pistol length gas tubes because they were designed as a SBR / pistol the suppressor increases pressure for function its very pricy round certainly fun to play with loads etc however considering we can't own suppressors , I would not recommend .300 blackout SBR/pistol as your primary shooter .

X39 is Cheap and fun very obnoxious on the range in a SBR pistol but loads of fun I don't own a x39 SBR mine if 16" but I had the opportunity to shoot one recently at the range its as fun .

Bushy

The 300 BLK was not specifically designed for suppression. The original design was known as the 300 Whisper and has been with us for at least 25 years, long before the revolution in civilian suppressor ownership. The Whisper was designed as a multi-purpose round that could operate supersonic and subsonic out of the same gun, without modifications. It gives the AR close to AK ballistics but with more options in bullet weight and velocity.

The reason for the pistol length gas system is to cycle subsonic loads. Subsonic doesn't mean suppressed.

The reason for a conventional short barreled rifle in 300 BLK over a 762x39 is right in your last sentence. Because the alternatives are fricken obnoxious as hell on the firing line. Even full power 300 BLK rounds from a short barrel are much less noisy than the 556 or 762 versions.

7.62x39 AR's suffer from bolt failure due to the very thin rim of the opened up bolt.

 

[redshooter]

Because 221 FB is hard to come by and ridiculously expensive when you can find it. 223 brass is both plentiful and cheap.

Your right about it being plentiful and cheap! Just to see if my position has any merit I've been looking for 221 brass, no luck...but Henry has both Hornady and Armscor 300 blk. The Armscor is a pretty nice price if it's even half way decent stuff.

I was thinking about a 9mm AR to keep the cost and blast down, but I want a multi-purpose lower (I'd go with Glock mag lower if 9mm). If that Armscor Brass is decent the 300 Blackout just made my list (already reloading for 30-06 shared is almost as good as cheap).

I'm not too keen on all that work on the Brass for a good reason...all my digits don't function like they use to.

 

[bushwacker's]

The majority of operational adoption has been for use as a suppressed SBR , I just posted a Video about the trials and tribulations of the 300 Whisper I am aware of the history , from the persecutive of Special operations use by the US Special operation command the only time .300 black out is a option is when suppression is required my friend in Tampa worked on the development of a a number of .300 BO SBR's they recently received there first contract to produce Rifles for the US military , I am just repeating what I a have been taught and I am sure I have missed more than I have said .
I own more than 1 300 black out so I am not being critical however again I would not recommend someone buy a .300 black out as there first AR I like the round I am about to purchase a Bolt gun in .300 so I can test my loads on the SK coyote population !

Bushy

The 300 BLK was not specifically designed for suppression. The original design was known as the 300 Whisper and has been with us for at least 25 years, long before the revolution in civilian suppressor ownership. The Whisper was designed as a multi-purpose round that could operate supersonic and subsonic out of the same gun, without modifications. It gives the AR close to AK ballistics but with more options in bullet weight and velocity.

The reason for the pistol length gas system is to cycle subsonic loads. Subsonic doesn't mean suppressed.

The reason for a conventional short barreled rifle in 300 BLK over a 762x39 is right in your last sentence. Because the alternatives are fricken obnoxious as hell on the firing line. Even full power 300 BLK rounds from a short barrel are much less noisy than the 556 or 762 versions.

7.62x39 AR's suffer from bolt failure due to the very thin rim of the opened up bolt.

 

[Non-phixion]

To the OP do not buy an NEA PDW it is a giant piece of garbage. I've seen 3 have catastrophic parts failure in under 2K rounds.

 

[redshooter]

To the OP do not buy an NEA PDW it is a giant piece of garbage. I've seen 3 have catastrophic parts failure in under 2K rounds.

Look another...there are so many anti-fan boys it's hard to keep track.

cat·a·stroph·ic

adjective: catastrophic

1. involving or causing sudden great damage or suffering.
"a catastrophic earthquake"

•involving a sudden and large-scale alteration in the state of something.
"the body undergoes catastrophic collapse toward the state of a black hole"

•of or relating to geological catastrophism.

2. extremely unfortunate or unsuccessful.
"catastrophic mismanagement of the economy"

synonyms: disastrous, calamitous, cataclysmic, apocalyptic, ruinous, tragic, fatal, dire, awful, terrible, dreadful
"the losses were catastrophic"

A part failure shouldn't be called Catastrophic unless the rifle actually fails catastrophically, I guess from the parts perspective it is, but that grossly overstates the problem in pretty much every case. Since the rifle didn't blow up then it was just another AR-15 rifle part failure. Guys who shoot AR-15's often will have spare parts...why do you suppose that is?

I took courses on Stats and QC while studying Engineering Technology, and one thing my informed opinion tells me is statements like the one quoted are totally useless. I have seen what? Three rifles that had part failures? How about one rifle that had three parts fail? What were the parts? With no further information all the quoted reply has done is add to the clutter.

If anyone has an urge to "add" to the conversation in this manner, please help us all out and keep it to yourself.

 

[Sqr]

To the OP do not buy an NEA PDW it is a giant piece of garbage. I've seen 3 have catastrophic parts failure in under 2K rounds.

I have witnessed a number of catastrophic failures with the Datsun B210's, however people continue to enjoy driving the new Nissans.

 

[thump_rrr]

Your right about it being plentiful and cheap! Just to see if my position has any merit I've been looking for 221 brass, no luck...but Henry has both Hornady and Armscor 300 blk. The Armscor is a pretty nice price if it's even half way decent stuff.

I was thinking about a 9mm AR to keep the cost and blast down, but I want a multi-purpose lower (I'd go with Glock mag lower if 9mm). If that Armscor Brass is decent the 300 Blackout just made my list (already reloading for 30-06 shared is almost as good as cheap).

I'm not too keen on all that work on the Brass for a good reason...all my digits don't function like they use to.

It really doesn't take that much effort to make 300BLK brass.
I can chop 100 cases to rough trim length in 5 minutes using a Harbour Freight 2" chop saw and jig.
I have Carpal Tunnel SYndrome myself so I know where you are coming from.

 

[1199max]

I have witnessed a number of catastrophic failures with the Datsun B210's, however people continue to enjoy driving the new Nissans.

this is gold. i will get a nea pdw. the question was about the caliber choice. i did look at X39 and its cheap but i enjoy reloading hence the 556 vs 300aac.

 

[Sqr]

this is gold. i will get a nea pdw. the question was about the caliber choice. i did look at X39 and its cheap but i enjoy reloading hence the 556 vs 300aac.

Personally I would go 5.56 or x39 if your going to reload which also gives you the option to purchase bulk when you get lazy. 300 ACC remains a niche caliber in Canada.

 

[legi0n]

there is 7.62x39 brass you can reload

 

[hbean]

I currently own a 7.5" PWS AR in .223 and a 7.5" XCR Micro in 7.62x39, I would highly recommend going with a 9 mm instead, you are not going to missed anything with a pistol caliber for a range only CQB gun.

 

[CobraGT]

I currently own a 7.5" PWS AR in .223 and a 7.5" XCR Micro in 7.62x39, I would highly recommend going with a 9 mm instead, you are not going to missed anything with a pistol caliber for a range only CQB gun.

I dunno, I have 9mm subguns as well, and yet I still find my 7.5" Vz, AR, and XCR are some of my favorite guns

 

[hbean]

I dunno, I have 9mm subguns as well, and yet I still find my 7.5" Vz, AR, and XCR are some of my favorite guns

Based on the original post the criteria stated was less than 50 yards, .223 and 7.62x39 are obnoxiously fun to shoot out of a 7.5" barrel I am not arguing about that, however the concussive force from the muzzle blast can get tiresome after awhile, at 50 yards the 9 mm will be more than capable and more enjoyable.

 

[katazone]

7.5" are a lot of fun in any calibers....but they are loud asf !!!! and actually still quite accurate for any restricted fun you'll ever have!
I wouldn't do it in 300blk though!
I have several ARs and my 300 Blk is a 12.5" Faxon Arak21 upper which length was recommended for a piston driven for proper cycling, the verdict is.....although really nice to the feel, it is an expensive round and since we don't hunt with our ARs, I don't see the point other than the luxury of having one to shoot from time to time and
Some of the guys are right here.....build or buy yourself a nice little 9mm.....super fun. Some take Glock mags so 10 rounds is not an issue and if you get a 40 cal mag for 9mm and...well...you know the result of that

These little guys are ready to go at a pretty good price point if you don't want to build:
http://www.canadiangunnutz.com/forum/showthread.php/1364488-New-Angstadt-Arm-UDP-9-SBR-s-are-coming

If not, I'd look into Quarter Circle 10 Glock receivers. Look for thread on that too.

Good luck