The SIG 556xi Russian.
This seems like a nice rifle. The upper and lower are tight, it's lighter, no plastic hand guards.
The lower is dimensionally identical to the SIG 556R. The trigger is the same. There's an integrated extended winter trigger guard on the lower of the SIG 556xi Russian though. That's a nice touch. The pistol grip is smaller and has a more solid feel which is pretty nice.
Even though the 556R is heavier it's components seem a lot more solid and durable. The 556R is closer to the original Swiss 556 in design and materials.
The SIG 556R beautiful gas system is gone with the big adjustment knob that can be handled with a glove in cold weather. Gone is the giant gas block with integrated sling attachments and non folding SIG front sight. Gone is the nice heavy barrel permanently attached to the upper.
Now, the new SIG 556xi allows you to change the barrels. So now you can switch calibers by changing out the barrel and bolt. If you want you can switch the charging handle to the left side. The rubber charging handle slot guides to keep dust out can be replaced easily now because they are held in with a clip not riveted in. The new rifle comes in a SWAT configuration which is a simply a smooth hand guard with minimal railing capability. It comes with folding BUIS. Also, a 3 pronged flash hider (for some reason). There's an integrated extended winter trigger guard on the lower. So that is different.
The 556xi Russian upper can fit directly onto the 556R lower. So if you can get just the upper you can instantly upgrade.
I have the SIG 556R which I am really happy with. But, since I can get the new lower and put it on my upper I'll be able to get the nice extended winter trigger guard and nice pistol grip. The upper is the serialize portion of the gun so this won't be a problem.
So, in summary, there are a lot of changes to get the gun a little lighter but I'll keep my rifle and possibly get the new lower to get the newer stuff on it.
|SIG 556xi Russian SWAT|
|SIG 556xi Russian|
|SIG 556xi Russian Detail, Replaceable rubber dust cover.|