5R Barrel

[cyphertext]

So, 5R = 5 groove, Russian pattern.

So you are saying that my American homeland defense rifle has a Commie barrel?

 

[Jim Watson]

No, it has five grooves instead of four; so it must be 25% better.

 

[rockquarry]

No conclusive statement here as I've had experience with only four 5R Remington barrels.

Consider trying more than one of these barrels before making a decision as to the 5R rifling method in itself being an improvement over other rifling types. There is certainly nothing wrong with the design and well-made 5R barrels will shoot as accurately as other well-made barrels. Whether the 5R feature offers any more than a theoretical textbook improvement as opposed to a real improvement remains unclear. There likely are marketing aspects that also merit consideration. However, a good barrel is a good barrel regardless of how it is rifled.

As for comparative ease of cleaning and reduction in copper fouling with 5R barrels, this too remains unclear. Many of today's mass-produced hammer forged barrels with conventional rifling are easier to clean and copper-foul far less than similar barrels of just a few years ago.

Three of the 5R Remington barrels I've used have been very accurate. One was mediocre. I can make exactly the same statement about Remington barrels from twenty-five or more years ago.

5R barrels have been produced in this country by Boots Obermeyer for a long time, I guess since the '70s or so. Mr. Obermeyer has an excellent reputation for building fine barrels.

 

[AZWinger06]

AZWinger06, did you ever order your rifle? If so, what did you order?

I bought the 15T. It has the free float rail. Haven't taken it to the range yet.

 

[Luger9x19]

I bought the 15T. It has the free float rail. Haven't taken it to the range yet.

Did you get the 15T with the quad rail or the newer M-LOK.

Both fine rifles.

 

[AZWinger06]

Did you get the 15T with the quad rail or the newer M-LOK.

Both fine rifles.

The quad rail. It came with three rail covers.

 

[Luger9x19]

The quad rail. It came with three rail covers.

Those rail covers will save your hands.

Congrats on the new rifle. Looking forward to a range report.

 

[bikendan]

I bought the 15T. It has the free float rail. Haven't taken it to the range yet.

Love my 15T. have had it for nearly 5 years.

 

[touchoneoff]

Wait, that 1:8 was a gain twist? What rate does it have at the chamber?

 

[touchoneoff]

My Sport II has the standard 4140 1:9 twist, and as long as I don't go any heavier than 69 grains, it is very accurate....honestly, with good ammo, it will shoot a 1.25 MOA.

 

[WR Moore]

My Sport II has the standard 4140 1:9 twist, and as long as I don't go any heavier than 69 grains, it is very accurate....honestly, with good ammo, it will shoot a 1.25 MOA.

It should shoot the Hornaday 75 gr HPBT round very well. NOT the A-Max of the same weight. That one is too long. No clue what the 77 gr SMK does, but Sierra suggests nothing slower than 1-8.

 

[jimbo728]

Wait, that 1:8 was a gain twist? What rate does it have at the chamber?

There have been many statements about the gain twist in the early 1 in 8 5 r barrels. I have never heard anything to definitively confirm this. I really believe if it says 1 in 8 twist rate that is what it is.
Jim