Barrel idea for AR pistol.

[erinmt]

So here's the idea and I wanted to see what feed back I'd get to see if it's a viable plan.

Also if someone from BHW could chime in on it to see if it's doable that would be awesome!

I'm thinking:
12.5" stainless and Black Nitride.
Mid length gas with .070 gas port.
.80 behind gas block, .750 gas block, .700 past GB.
Deep straight fluting down to .680.
1/8 Poly BHW awesomeness.

I'm looking to gain stiffness in the barrel to maintain sub MOA groups under decent volume fire while not being too heavy. And the nitride should give me great durability in the poly rifling. With proper assembly I'm expecting this barrel to give me 10 inch grouping with hand loads out to 800 meters if I do my part.

Atleast these are my theories. What say you all?

[Deleted]

Feb 10, 2014 19:40:12 GMT -8 erinmt said:

So here's the idea and I wanted to see what feed back I'd get to see if it's a viable plan.

Also if someone from BHW could chime in on it to see if it's doable that would be awesome!

I'm thinking:
12.5" stainless and Black Nitride.
Mid length gas with .070 gas port.
.80 behind gas block, .750 gas block, .700 past GB.
Deep straight fluting down to .680.
1/8 Poly BHW awesomeness.

I'm looking to gain stiffness in the barrel to maintain sub MOA groups under decent volume fire while not being too heavy. And the nitride should give me great durability in the poly rifling. With proper assembly I'm expecting this barrel to give me 10 inch grouping with hand loads out to 800 meters if I do my part.

Atleast these are my theories. What say you all?

12.5 stainless black barrel is doable
mid gas. I would go with a carbine gas system. Better reliability
Your barrel profile is close to a standard profile
Your fluting is also doable
1 in 8 twist definitely

[GLSHOOTER]

Don't forget a big scope. .....

Greg

[erinmt]

To gain the rigidity I'm aiming for do you think the .80 behind the block is enough or would .850 be a better bet? I'm ok with a touch more weight to gain stiffness.

And it will be using a Trijicon ACOG 3.5x with the M249 ballistic drop reticle out to 1K. I've used it out to 1K on 24" steel plates with pretty good luck on my 14.5". It did the job well enough. I just really like the balance of the 12.5" and I'm willing to give up a couple hundred meters for the added mobility and weight loss.

[Deleted]

Feb 11, 2014 21:36:00 GMT -8 erinmt said:

To gain the rigidity I'm aiming for do you think the .80 behind the block is enough or would .850 be a better bet? I'm ok with a touch more weight to gain stiffness.

And it will be using a Trijicon ACOG 3.5x with the M249 ballistic drop reticle out to 1K. I've used it out to 1K on 24" steel plates with pretty good luck on my 14.5". It did the job well enough. I just really like the balance of the 12.5" and I'm willing to give up a couple hundred meters for the added mobility and weight loss.

For your intended purpose I would go with the heaviest barrel I could. The increase in weight from .800 to .850 will not be noticeable.