[drewcog]

Hey Guys & Gals,

I have a Sig 516 from ~2012 that I love and is setup with a Geisselle trigger, ACOG/RMR combo on top, and a Surefire muzzlebrake on the end to host a Surefire suppressor. The one issue I've had over the years is accuracy, in that not matter what ammo I try, I'm generally around 2" groups at 100 yards. So the question:

Is there a better barrel available for this (16-18" length) that will allow me to retain the factory piston setup? If not, is it convertible to DGI? I'd like to keep the piston setup since I shoot suppressed, but my main goal is improving accuracy closer to MOA.

Thanks for y'alls help.

 

[Steve40th]

As far as I know, there is no direct barrel replacement. But, I am sure it can be done if a company has a barrel on hand to make one to fit. I think it is the barrel nut that is the only issue though.
But, converting to DI is easy, just swap the entire upper with another upper that is DI.

 

[Mills]

My 516 get moa . My most accurate load at 100 m is a 55 gr hornady fmj Varget powder.
2 moa is terrible for a 223 / 556 imho.
Good luck .
Mills

 

[Steve40th]

I was going to say, get a real accurate round, Black Hills 262 for example. Then reevaluate.

 

[Mills]

Here is the 516 with a DI upper free float.

 

[drewcog]

But, converting to DI is easy, just swap the entire upper with another upper that is DI.

Of course I can swap uppers, but that takes all the fun out of it

I was going to say, get a real accurate round, Black Hills 262 for example. Then reevaluate.

I've tried the full gamutt of FMJs from 55gr - 62gr. I've also tried a variety of Hornady in various size bullets, and Black Hills in 77gr. Don't mind trying other ammo, but at some point one just begins to wonder if its a component. My Wilson for example is sub-MOA with the Black Hills as is my Larue...

I think it is the barrel nut that is the only issue though.

What's unique about the barrel nut? Does it need a proprietary wrench?

 

[Steve40th]

What's unique about the barrel nut? Does it need a proprietary wrench?

Yes its proprietary.. Supposedly you can make one.. I think a sig armorer can get one..

 

[Damon]

The 516 is quite capable of sub moa. Firearms will work with a variety of ammo but will show a preference when checking accuracy.

 

[xrlizard]

I've gotten sub-moa with 77gr PMC x-tac match on mine but had less accuracy with everything else so far. I believe others are correct on the lack of barrel upgrades and am certain on the proprietary barrel but.