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Discussion Starter · #1 ·
So, after a horrible experience with Moriarti Armaments, I have a 6.8 AR Pistol that I am working on troubleshooting and fixing myself. After receiving the rifle back, a second time from this company, I had a horrible experience at the range, and I am really needing to get this thing reliable.

When I pulled it apart to clean it, I noticed that the BCG and I believe that the barrel is marked as .224 Valk and I have been shooting 6.8 SPC. Does this make sense? I can double check this and get some pictures up, but I really need some feedback in troubleshooting this rifle.
 

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Mags and BCG are the same.

I don't think 6.8 will chamber in 224V due to where the shoulder is located (pushed back). If the bbl is labeled 224V maybe they rechambered it? Sorta crazy

ETA: BCGs are the same but will often be priced differently. I just buy whichever is cheaper (particular example is Toolcraft)
 

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Even if the 6.8 would chamber in the .224V barrel it would like have a catastrophic failure if fired. Trying to put a .270 projectile down a .224 bore would not be pretty.
I remember someone dropping a 5.56 into a 6.8 rifle one time. Seems they pulled the charge handle back and let it fly 5-6 times to get it to lock up so they could pull the trigger. His voice was a little shaky and he said he had blackface but was otherwise unhurt and learned there is a difference between a 5.56 and a 6.8.
I can see how someone could shove a 6.8 bullet back in the case far enough to chamber in a V, when there is a will there is a way.
 

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I can see how someone could shove a 6.8 bullet back in the case far enough to chamber in a V, when there is a will there is a way.
Right, but if you fired that 6.8 bullet in a 224V chamber it would not be the same as putting a .224 round through a .277 bore. I am willing to bet it would be a little worse than just black face.
 

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A 224 Valkyrie is a .223 diameter bullet. A 6.8/.277 (Actually 7.0mm) bullet. A .223 bullet will bounce around inside a 6.8 barrel. A .277 bullet will not go through a .223 barrel. :rolleyes:
 

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A 224 Valkyrie is a .223 diameter bullet. A 6.8/.277 (Actually 7.0mm) bullet. A .223 bullet will bounce around inside a 6.8 barrel. A .277 bullet will not go through a .223 barrel. :rolleyes:
7mm is .284, as you said a 6.8 is .277. A .224 V and a .223 Rem is a .224 diameter bullet as is a 5.7x28, 220 swift, 22-250 etc.
 
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Discussion Starter · #14 ·
Sounds good, I am going to pull it apart again before taking it out. As far as the barrel goes, it must be a 6.8 SPC, considering I have shot about 30-40 rounds through it. Thank you all for the information on this. Just trying to troubleshoot this thing to get it reliable for personal use or sell it used. I just want to make sure it is working consistently either way. Hopefully get out to the range this weekend and try it all again.

I did find that the buffer spring that they put in was about 3 inches short and they did not tighten the tension screws on the drop in that they installed... won't be buying from them or recommending their product.
 

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7mm is .284, as you said a 6.8 is .277. A .224 V and a .223 Rem is a .224 diameter bullet as is a 5.7x28, 220 swift, 22-250 etc.
Yeah, you are correct on the diameter of the .223/.224.


Side note: IMHO - I have figured out the 270 Winchester (.277) creation mystery.
 

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Discussion Starter · #17 ·
Okay it is a 6.8 SPC barrel and .224 Valkyrie bolt. After receiving it back from MA the last time, they installed a drop in without tightening the tension screws and for some reason the buffer spring had 3 in cut from it. Cleaned it up, tightened the trigger and put in another buffer spring. Thanks for all the feedback and PM's. I will let you all know how it goes.
 

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Yeah, you are correct on the diameter of the .223/.224.


Side note: IMHO - I have figured out the 270 Winchester (.277) creation mystery.
I am pretty sure I am correct on the diameter of all of them. You stated " A 6.8/.277 (Actually 7.0mm) bullet". That is not correct. A 6.8 is a .277 diameter bullet, a 7mm is a .284. That was the point I was trying to make. The .270 Winchester is the same diameter as the 6.8 SPC. What is this .270 Winchester "creation mystery" you speak of? It is simply a 30 06 case necked down to .277. No mystery that I know of.
 

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I remember someone dropping a 5.56 into a 6.8 rifle one time. Seems they pulled the charge handle back and let it fly 5-6 times to get it to lock up so they could pull the trigger. His voice was a little shaky and he said he had blackface but was otherwise unhurt and learned there is a difference between a 5.56 and a 6.8.
I can see how someone could shove a 6.8 bullet back in the case far enough to chamber in a V, when there is a will there is a way.
Been there done that, nothing spectacular, just a crudley fireformed case. Didn't build much pressure.
 

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I am pretty sure I am correct on the diameter of all of them. You stated " A 6.8/.277 (Actually 7.0mm) bullet". That is not correct. A 6.8 is a .277 diameter bullet, a 7mm is a .284. That was the point I was trying to make. The .270 Winchester is the same diameter as the 6.8 SPC. What is this .270 Winchester "creation mystery" you speak of? It is simply a 30 06 case necked down to .277. No mystery that I know of.
I agreed that you are correct about the diameter of the .223/5.56 bullet.. Also, yes, 6.8 caliber is a..277 diameter bullet. Yes, Mauser took the .284 & claimed it as 7mm. There is where 6.8 comes in.
However, 0.277 inch = 7.035 8 millimeter and 0.270 inch = 6.858 millimeter.

The mystery has been 'Why & how did Winchester come up with a .277 diameter bullet/cartridge in 1923?
 
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