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My 308 AR Project


Firemaniv

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I have been wanting to build an AR for a while now but did not want another 556 gun. I found this forum and figured out what I wanted to build  I have been gathering parts now for about a month and my receiver set came in on Friday. 

 

I do have a few part left to get that are on order or that I need to order. My BCG is a black rain and I should have it in a couple of weeks. I also got a black rain Adj. gas block and told them to hold it til they could ship it and the BCG together. I need to get a qd muzzle device and order a raptor charging handle. I am left handed so I have alot of ambi parts on my build.

 

As for the build here is what I have so far.

Mega Arms Megalithic upper and Ambi lower

Mega Arms 16" barrel

Magpul UBR  stock and Miad, both in stealth grey

Heavy Buffers Car-10xh buffer and spring

Geissele SSA-E trigger

Battle arms 45 degree ambi safety

Norgon ambi mag release.

 

 

I assembled the lower over the weekend which took no time at all. The maten lower came with many parts already installed  which was cool.

 

Parts and tools from Brownells

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Furniture waiting on a home

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Heavy buffer arrived

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The receiver set and barrel arrived

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Lower assembled 

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My bolt carrier group and gas block arrived yesterday. I only had time for a test fit and the gas block fit fine on the barrel. I can also get to the gas block through the front part of the upper to install the gas block after I mount the barrel. now I just need to find time to work on it.post-15061-0-70012600-1427332660_thumb.j

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  • 1 month later...

I finally got some time to finish my rifle. I wanted to go shoot it but ran out of time the other day. I hope to put test rounds through it this weekend preferably at a target if I can get one set up.

I need to get a light for the rifle but that is about it.

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I shot the first 50 rounds through my build. The first 25 rounds were spend getting the eotech on paper and the gas block adjusted. I had many failures to ejects with the first magazine.

I shot the whole 2nd mag in pairs without any issues after getting the gas block set. I hope to get some more time to go back out to finish sighting in my eotech and to just shoot the rifle.

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  • 2 weeks later...
  • 5 weeks later...

So now I need some help. I have shot 135 rounds, give or take a few, I have been having failure to eject causing a double feed of the empty case and a new round trying to be chambered.

First 25 rounds had this issue until gas block opened all the way up. 2nd 25 rounds shot as paired groups with no issues.

3rd and 4th sets of 25 rounds, same problem every 4th or 5th shot.

Mega arms and black rain ordnance both called about gas block. Both say need a small gap between rear shoulder on mega arms barrel and both do not give any measurement.

Barrel and gas block pulled and reinstalled with ever so slight gap.

Per black rain, I closed gas block and fire 1 round at a time adjusting gas block until bolt locked back on empty mag. 3 to 5 rounds the tested with problem still presenting.

Most ammo of the used was 150 grain fmj

I tried 10 rounds of my reloads that have 168gn A-max bullets, no issues.

Why is a heavier bullet working and plinking ammo is not?

Black rain said that the failure to eject could be the bcg going to fast....

I have always assumed the issue was gas related.

What else can I try or check?

Thanks

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