What twist on AR barrels?

[stiletto raggio]

I am going to buy an AR next month, almost certainly form RRA. I was wondering what twist I ought to get. I can either get a Chrome/Moly 1/9" or a stainless 1/8". The stainless runs about 100 bucks more than the CM, but I want to make sure I can get the most versatile assortment of loads to work in the rifle. Will the 1/9" barrels stabilize a 77 or 75 grain bullet? Will the 1/8" barrel shoot 55 grian loads well? Muzzle Break or no?

It will be in one of the Tactical CAR A4s with an Entry buttstock and a rail system. I'll be putting a Sierra Precision Rifle adjustable buttplate and either a Meprolight Reflex or AimPoint on it. I want it to be a good CQB weapon, but also to serve as an intermediate range weapon (when my M1A is too heavy to carry) for use against coyotes, etc.

[mindonmatter]

Originally posted by stiletto raggio
The stainless runs about 100 bucks more than the CM

I don't have an exact answer to you question, but I went with the 1:9 because it's supposed to be a great middle ground.

As far as the $100 more for stainless part of your post....

Don't get your RRA from RRA. Get it from ADCO Firearms, that's where most people I've heard from get there's, and where I got mine. Great service, prices, and fast shipping. You can upgrade to stainless for $50. RRA Uppers (http://www.adcofirearms.com/rockriver/rrauppers.cfm?page=rra)

If you buy the upper and lower seperately and just put them together instead of buying a complete rifle, you can save another $100 or more because you don't pay the 10% excise tax. www.eaglefirearms.net has the best prices on lowers. Their website says they're sold out, but I believe they have them back in stock now.

[wishywashy]

The 1 in 8 twist would be a good medium. My 1 in 7 shoots 55 grains very accuratly and also the heavier 75 grain bullets. If you were going to shoot just the lighter bullets I would recommend the 1 in 9. I would spend the extra for the stainless. The rifling tends to last a little longer and they clean up easier.;f

[Savage]

My 1/9 Varminter will stabilize up to 75 grains. From what I hear, this is not uncommon. It nearly one holes the 69 grain Sierra at 100 yards. I've killed groundhogs with this rifle well past 300 yards and a few right at 400. It seems to fit the bill for me.

[WalterGA]

Originally posted by mindonmatter
you can save another $100 or more because you don't pay the 10% excise tax. www.eaglefirearms.net has the best prices on lowers. Their website says they're sold out, but I believe they have them back in stock now.

You have to pay the excise tax on the lower. Unless you're shooting competition, I'd opt for the chrome-lined, as opposed to plain chrome-moly or stainless.

[mindonmatter]

Originally posted by WalterGA
You have to pay the excise tax on the lower.

I was under the impression you only pay excise on a complete rifle. What you say makes sense though, since the lower is considered the actual gun. Either way, I guess I'd rather pay excise on the receiver instead of the whole rifle.