Build Advice - 300 Blk

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drail46

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Calgary, Ab
Hey All,

So I've had an urge to build an ar15 for awhile now and I need some advice. I want to build a 300 blk PDWesque rifle, so I want to keep it small, but my main concern is reliability. To start the build I've already picked up an armalite lower with a colt lower parts kit in it. My next step is an upper and a barrel. I am looking for recommendations on a couple things....

1. Should I use a 7.5" or a 9" barrel. Which would best for reliability (cycling super and subsonic rounds)
I went with a 8.2" Noveske

2. What would be a good upper to use?
I went with a Lantac UAR - Does anyone have any reviews on these?

I dont really have a set budget for the build so I don't want to go cheap out but I also don't want to spend too many night in the dog house when the wife sees the price tag. Lol

UPDATE: Once the parts start arriving I will start posting some build pictures.

Thanks,

Drail
 
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I'm running a 10.5" DD barrel. Pretty darn accurate and haven't a single stoppage as yet, knock on wood.

I had issues with an NEA barrel when I first started my build and they replaced it with another but while waiting for them to test the barrel etc, I'd already bought the DD.
 
So reading between the lines, I should probably stay away from NEA barrels for this project. Lol. I think I'm narrowing it down to a 9" AAC barrel of a 8.2" Noveske. Both are a 1:7 twist.

I'm also looking at an NEA CCS stock..... Any experience with them?
 
drail46 said:
So reading between the lines, I should probably stay away from NEA barrels for this project. Lol. I think I'm narrowing it down to a 9" AAC barrel of a 8.2" Noveske. Both are a 1:7 twist.

I'm also looking at an NEA CCS stock..... Any experience with them?
Click to expand...

Never tried a CSS stock but I'm liking the direction your build is going!
 
drail46 said:
So reading between the lines, I should probably stay away from NEA barrels for this project. Lol. I think I'm narrowing it down to a 9" AAC barrel of a 8.2" Noveske. Both are a 1:7 twist.

I'm also looking at an NEA CCS stock..... Any experience with them?
Click to expand...

There is nothing wrong with an NEA bbl. in fact I think their barrels are probably the best single component they make. I've got a 12" NEA 300 BLK upper and it works fine.

If you are going with the CCS stock then you really should go with a 7" bbl. The two just seem to go together.
 
For reliability with subsonic loads in short bbl lengths you will need a pistol length gas system. Supersonic will then pound the hell out of your BCG. That's the trade-off.

My brass is not reloadable after shooting supersonic loads, the primer pocket is too warped from the ejection.
 
Thats really good to know.... I never thought of that. Should I be looking at an adjustable gas block to help mitigate some of the wear to the BCG as I foresee shooting more supersonic than sub as we can't get suppressors up here? This is should be a fun project. I think my goal is to keep it around 21" in overall length with the stock collapsed or shorter if possible.

Dave_G said:
For reliability with subsonic loads in short bbl lengths you will need a pistol length gas system. Supersonic will then pound the hell out of your BCG. That's the trade-off.

My brass is not reloadable after shooting supersonic loads, the primer pocket is too warped from the ejection.
Click to expand...
 
drail46 said:
So reading between the lines, I should probably stay away from NEA barrels for this project. Lol. I think I'm narrowing it down to a 9" AAC barrel of a 8.2" Noveske. Both are a 1:7 twist.

I'm also looking at an NEA CCS stock..... Any experience with them?
Click to expand...
I am currently building a 300BLK. I am using a 9" AAC barrel, VLTOR VIS KM7 upper, Colt Canada Lower, Daniel Defense Lower Parts Kit and the plan was to use a NEA CCS.

The CCS has been very frustrating. The stock knucke is well out of spec and cannot fit in the knuckle hole of the confirmed correctly dimensioned Colt lower. Also, the rails of the CCS are out of spec and will not fit around the lower without scraping. This was a new, latest generation CCS.

The retailer sent me the NEA contact info. NEA has ignored my request for help. The retailer is now attempting to get NEA to get off their Duffs and earn their money.

There are other options for a CCS type stock that I would encourage you to choose. They are twice as expensive, but buying the CCS for half the price is useless when the stock doesn't fit.
 
I can tell you from personal experience buidling with Noveske and AAC barrels they are both extremely accurate and reliable. If you do get the AAC be wary of the barrel index pin being longer than most barrels. I had to take a few passes with a rasp to shorten it so the barrel nut would glide over with no interference.
 
My AAC barrel is already installed in the VLTOR upper. No issues. Very tight fit, but tight is a good thing when it comes to barrel installs.

I will be sure to post a pic soon. Hopefully my CCS issue will be resolved and I can shoot her
 
Dave_G said:
For reliability with subsonic loads in short bbl lengths you will need a pistol length gas system. Supersonic will then pound the hell out of your BCG. That's the trade-off.

My brass is not reloadable after shooting supersonic loads, the primer pocket is too warped from the ejection.
Click to expand...

Adjustable gas block!

Oversized primer pocket is generally a sign of over pressure. Not sure how a violent ejection cycle would impact the primer pocket?
 
P.S. - got my 9" barrel from ATRS in Calgary, along with JP Enterprises handguard and ATRS Flash Eliminator for that supressed look.

blk_zps3oamsevs.jpg


Dave
 
Dave_G said:
Me either. But looking closely the de-primed pocket was definitely slightly out of round, as was the cartridge base itself.
Click to expand...

A deformed case head could really only be the result of pressure during the firing cycle. Max pressure is achieved very early in the process, long before the action tries to extract the case. Normally early or violent extraction results in torn or deformed case rim. I'd suggest you have the chamber looked at as that would seem to be the most obvious source of case head deformation.
 
Suputin said:
A deformed case head could really only be the result of pressure during the firing cycle. Max pressure is achieved very early in the process, long before the action tries to extract the case. Normally early or violent extraction results in torn or deformed case rim. I'd suggest you have the chamber looked at as that would seem to be the most obvious source of case head deformation.
Click to expand...

Thanks for the advice. I tossed all the affected cases so can't re-inspect or photograph, and the effect would probably have been too subtle to be visible in a picture anyways. If I had had a primer pocket reamer at the time I might have been able to reload them, but there was no way I was going to try and force a primer in.
 
I will keep an eye on the pressure and maybe get an adjustable gas block if needed. I'm really leaning toward the Noveske 8.2" barrel. Does anyone in Canada stock the Troy PDW stock? If lots of people are having issues with the NEA CCS I may look at the Troy then, even though it looks exactly like the NEA.
 
drail46 said:
Hey All,

So I've had an urge to build an ar15 for awhile now and I need some advice. I want to build a 300 blk PDWesque rifle, so I want to keep it small, but my main concern is reliability. To start the build I've already picked up an armalite lower with a colt lower parts kit in it. My next step is an upper and a barrel. I am looking for recommendations on a couple things....

1. Should I use a 7.5" or a 9" barrel. Which would best for reliability (cycling super and subsonic rounds)

1a. Any reccomendations on a brand of barrel? What should I stay away from?

2. What would be a good upper to use?

I dont really have a set budget for the build so I don't want to cheap out but I also don't want to spend too many night in the dog house when the wife sees the price tag. Lol

Thanks,

Drail
Click to expand...

I went with a ballistic advantage 8.5 barrel
And aero precision upper and lower

Accurate and tight.

Saskatoon gunworks has them all
Lowers are on sale for 99.00
And upper fkr 129.99 I think

Ask for Darren

He built my last 2 ar15 and was excellent.
 
Nice. That is a good deal.... I wish I would have saw this earlier. I just sprung for a Lantac UAR upper. Has anyone seen any reviews on them. I've done a quick search and can't seem to find much. Are these uppers as good as they claim?
 
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