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The only thing I see that the SLR & Syrac has that the other don't is the dent adjustment which would limit the adjustment to the dent spots.

If I'm understanding correctly, the Syrac and SLR use the unthreaded "stem" portions on the end of their set screws to more effectively shut off gas in addition to the detent feature, which would limit you to 1/4 or 1/3 turn adjustments but would also allow some repeatability as you could count clicks.

Exactly...

It looks like the Wilson works the same as the SLR and Syrac as far as metering gas. That being said, the jam nut and straight gas tube are deal breakers for me.

Enlighten me on the problems of a straight gas tube.

a pound of rifle seems like a lot to me these days...

The photo below shows three metering screws. Syrac Ordnance on the left, SLR in the middle and JP on the right.

The JP is just an off the shelf cup tip set screw. The threaded body of the screw simply can't meter gas as effectively. When tuning a JP style block, you start with screw closed and back it out until the rifle completes a cycle of operation. These style gas blocks are either on or off given a specific cartridge. Once you hit the adjustment sweet spot, moving the screw in or out changes nothing (non-linear). I have no idea what type of screw the Wilson variant uses but I wouldn't be surprised if it were the same as a JP.

The Syrac and SLR variants work better because they have a machined metering surface. The metering screw on these models are precise enough that you can walk the ejection pattern through about 90 degrees. I'm prefer the Syrac varaint over the SLR for a few reasons:

1. The Syrac screw is purpose built whereas the SLR screw is just a turned down set screw.

2. The Syrac screw has four metering detents compared to the SLR which has three. This allows for more precise metering.

3. I'm not fond of the SLR leaf spring retention for the detent ball. It may be subjective but it's more likely to fail than the Syrac.

There's nothing wrong with it at all functionally. It's just another non-standard part I don't want to deal with.

Non Standard....Wasn't we talking about he AR10/LR308. There isn't anything standard that I am aware of. The straight tube is standard on mine.

Thanks, I may be looking back at this thread when making a parts list..

http://www.brownells.com/rifle-part...8-ar-chrome-lined-barrels-prod80214.aspx

This Criterion hybrid contour lists at 2.6 pounds.

Anybody have any idea what the S&W 18" barrel weighs? The S&W balances nicely in the hand. I think it is a pencil barrel.


Faxon:
http://faxonfirearms.com/18-medium-tapered-308-win-mid-length-4150-qpq/

Faxon is 2.28 lbs

Anything out there lighter and available?

After many years of puttering around with 5.56 Ar's I'm thinking of getting into the 308's. There are a lot of posts and threads about reliability problems. I really don't want to play around with reliability problems if I can avoid it.
And, I'll be looking at an entry level rifle, not a Knight or Larue, etc.
Any advice from you all who are experienced in this area?

A local dealer who has a good many high and low dollar rifles recommended getting started with a Bushmaster MOE which he said has been more accurate and reliable than many others.

Thanks for any help.