Depending on ammo, that sounds about right. 2 MOA is within "combat accuracy" limits. You're good in my book.

 

Sounds about right to me as well, it's not a bolt-action rifle. AR are for rapid shots and follow-up shots. Maybe some other folks are gets above average than you but it's about how I shoot as well.

 

Same here 2” groups is about right for me too. You could try some 77gr Match ammo and see if that does any better for you.

 

There has been a lot of chatter online about the spears not being accurate out of the box.
The general consensus that I have seen is that the suffer from barrel drift because of the retention type used for the barrel (I gather it's some sort of clamp system, rather than a barrel nut). Apparently Sig also failed to properly torque down the bolts on many rifles. You can call Sig and they'll likely tell you to torque those down to the recommended 60 in-lbs (double check me on this, I am quoting from memory). There are many videos out there of people locking an MCX in a vice and showing how the barrel can/will drift while not properly torqued down.

 

There has been a lot of chatter online about the spears not being accurate out of the box.
The general consensus that I have seen is that the suffer from barrel drift because of the retention type used for the barrel (I gather it's some sort of clamp system, rather than a barrel nut). Apparently Sig also failed to properly torque down the bolts on many rifles. You can call Sig and they'll likely tell you to torque those down to the recommended 60 in-lbs (double check me on this, I am quoting from memory). There are many videos out there of people locking an MCX in a vice and showing how the barrel can/will drift while not properly torqued down.

When you start with this type of barrel/chambering...It's no wonder that they are not that accurate out of the box. This is my original garbage barrel...Did they chamber it with a power drill??

 

Torque the barrel bolts to 60 inch pounds with a torque wrench starting with bolt 1 then going to bolt 2 as marked. Then retest with 77 grain projectiles. Be sure that the bolts or screws on your optic are torqued to spec and your optic is on the upper receiver and not the handguard.

As others have stated, 2 inch groups are ok. They may improve a small bit as the barrel breaks in.

Bill

PS: The Match Lite Duo trigger from SIG may give better results as would Geissele's MCX SSA. B

 

My 16" MCX Virtus has never shot as well as my 516, which will shoot MOA with good ammo. I checked the barrel bolts this morning- 1 was at about 48 in-lb and 2 was at 53 in-lb. I tightened them to 60, so next time I go to the range I'll see if that makes any difference.

 

It’s the P365 of SIG rifles.

I ❤ mine.

 

Barrels can sometimes take a bit to break in, maybe 100 rounds or more. Your ammo brand and bullet weight can also affect overall accuracy. And generally speaking, if you have more glass, your groups are going to be tighter as it takes "you" out of the equation.

I have barrels that like certain bullets and get better results with say a 60 grain vs. a 50 grain. Sometimes it requires finding what the barrel likes, especially if you hand load.

Barrel break-in is a touchy subject. I tend to shoot/clean until copper stops building up so rapidly and I inspect with a bore scope (rabbit hole!).

Here's two five shot groupings, the top is with a POF Revolution DI (.308 gas gun) and the bottom is a bolt action Sig Cross. I was developing a 110 grain load, just trying to see what sort of velocities/accuracy I could get out of this particular bullet as I have a bunch lying around and 3,000fps+ intrigues me. I completely pulled on shot with the AR so groupings are about the same for both albeit at different velocities and powder charges at 100 yards. If I'd thrown a red dot on the POF, my groups would have been larger without a doubt.

 

I torqued my barrel clamp bolts before I shot the rifle for the first time. Both were below spec. I loosened and retorqued them again before the last range session and couldn't tell much difference. I've tried 75 grain bullets, but it didn't shoot them very well. I'll keep trying different loads and see if I can find something it likes.

 

Best group of the day. 5.56 55GR Winchester range ammo. 16” LT with a 1-6 Tango MSR on a 1.93" mount at 100 yds.

 

View attachment 551165

Best group of the day. 5.56 55GR Winchester range ammo. 16” LT with a 1-6 Tango MSR.

What distance was this from?

 

Considering the ammo used, not bad.

 

What distance was this from?

100 yds

 

Very nice!

 

I find your results are the same as mine with factory Black Hills MK262 ammo. Not acceptable. I posted in the new member section what my issue was