Uronen Precision from Finland are known for their competition AR-15 rifles. The ones I’ve tried shoot really accurately.

In fact, their rifles are almost too accurate for what’s needed in practical competition. But if accuracy’s included in the price and overall package who’s to complain?

The photo above shows two barrels. The longer one is the Uronen Precision 18″ with medium profile and the shorter is their new 16.5″ barrel.

This is what Uronen Precision wrote and what got my attention:

According to feedback from our customer’s and the Uronen Precision shooting team members, we have designed a new model of the Uronen Precision .223/5.56 Match barrel.

The new barrel is 16.5″ long and has rifle gas system and is only available with polygonal rifling.

The first batch of barrels have medium a profile and weight of the barrel is 1 070 grams. This means, that the new 16.5″ barrel weighs 20 grams more than our 18″ barrel with light profile.

As a reference, 1 070 grams equals 2.36 pounds.

This new development means that the previous 16″ barrel project with an intermediate gas system is buried.

According to UP’s testing, the 16.5″ barrel with rifle gas system gives superior shooting abilities when compared to the intermediate 16″.

When I started buying and specifying competition AR-15s I was taught that you need an 18″ barrel to use a rifle length gas system. Apparently, that is not (no longer) true or never was.

I’m told the reason is because they are using polygonal rifling: https://en.wikipedia.org/wiki/Polygonal_rifling

Here’s an interesting read on the subject. (Gas System Length Facts and Fiction)

To show you what the UP rifles are capable of, below is a picture supplied by a happy customer, showing no less than FIVE 52 gr Nosler CC bullets in what I would call one hole.

The test was done by a customer in Estonia, fired from a sandbag support at 100 meters.

The ammunition is hand loaded, 25.0 grains of H335, IMI brass and primer, overall length 56.50 millimeters.

The barrel on this rifle is the 18″ version.

That has got to be one of the best 5 shot groupings I’ve ever seen from an AR15.