Sniper Country Duty Roster collective wisdom

Barrel technology - 5R:

But while we are at it how many PSS's have a 5R bbl on them. Mike
Calif. USA - Wednesday, December 16, 1998 at 18:08:08 (EST) 
About PSS's with 5R Bbls I have one and it just about took an act of Congress to get it.

Calif USA - Wednesday, December 16, 1998 at 22:40:12 (EST)

PSS with a 5R? God I wish!!! Please tell me this is so! I know the M24 left the shop with this but I did not hear of the current PSS model gettign this profile.

Scott <>
USA - Wednesday, December 16, 1998 at 22:41:49 (EST) 

Hey guys, please enlighten an old ex-Navy guy. What the heck is a Remington 5R barrel? Any relationship to the old Springfield 1903 star gauged barrels?
Doc <>
The Ozark boonies, MO USA - Wednesday, December 16, 1998 at 22:53:07 (EST) 
On the PSS with 5R (5 radial vice lands and grooves)barrels. I once taught a LE course where a feller had a PSS with a Mike Rock 5R barrel (M24 type). THe thing shot like a million dollars. Anyone know the deal on this? I think these barrels were used in the original PSS's but I'm not sure.

I've emailed Remington for clarification on some of this stuff. Wait out.

gooch <>
USA - Wednesday, December 16, 1998 at 23:12:10 (EST) 

Re: Remington 5R barrel

Good question.
Negative on any r

To the best of my limited knowledge, the 5R describes the type of rifling. In non-5R rifling the lands join the grooves with a relatively sharp angle. The 5R type has a small radius at the root of the lands. Supposed to have less gas leakage, less stress on the jacket material, etc. Don't know if this radius in is on the driving, or non-driving side of the lands, or both. Obermeyer, a top flight barrel maker uses it, and I think Rock. Don't know anything about Rock's barrels, and never heard of them being used in competition.

Don't know how many grooves either. BTW, some three groove barrels are doing fine in long range competition.

Ron N. <>
USA - Thursday, December 17, 1998 at 00:05:10 (EST) 

5R bbls we stole the design from the Russians is what I have been told. Mike Rock made the originals for the M24 for Remington, but Remington now makes there own. Both Rem and Rock bbls are great as well as the Obermeyer(If you can find one). A few guys out on the West Coast are using the Rock bbls for HP Comp. but Krieger is the big name here. Rock 5R is also the Stock bbl for the Armalite AR10T.

Calif USA - Thursday, December 17, 1998 at 01:17:44 (EST) 

5R barrels: Andy Webber used these on his AT1-M24. From the short time I spent with that rifle I can say one definite advantage is the minimal fouling properties of the 5R profile. It would seem, and I could be wrong here, that the profile causes less "damage" to the bullet jacket as it goes down the tube. This seems to result in the bore stripping off less jacket material, which in turn make cleaning out the copper easier as there is less present. We fired for two days with out cleaning and when I finally got around to it, after approximately 250 rounds, I could find almost NO copper fouling when cleaning with Sweets! I kept trying but it just was not there. This was with plain Jane 168 grian Federal GM. Armament Technology goes the extra mile to give you a good bore, but I didn't expect this result to be so dramatic. I assume it is the 5R profile that is responsible.

A PSS with a 5R. Hmmm...I wonder if the guy somehow got the custom shop to stick an M24 barrel in his PSS? If they make this a standard feature on the PSS, it would finally be worth the extra price.

Scott <>
USA - Thursday, December 17, 1998 at 10:30:20 (EST) 

On the 5R barrel's if my history serves me correct there were only a few 5R barrels put on the early PSS and if you were lucky enough to get one they were really shooter's!!! with accuracy up to 20% better than the standard 6 lans but to my knowledge there not putting them on the new one's. (I only wish they would)
Pat <>
USA - Thursday, December 17, 1998 at 11:08:52 (EST) 
As to the 5R bbls Yes the Custom Shop is the one that put on the 5R bbl for me. It took pulling some strings to do it and that was in 1997. I tried again last month with no luck. You see with supporting that Race Car they have all but closed down the Custom Shop. I haven't given up yet as the 5R is a better bbl.
Calif USA - Thursday, December 17, 1998 at 12:29:13 (EST) 
Is there anyway to verify what serial number string had the 5R on the PSS and what year they were produced? I believe a friend may have one of these as the accuracy is startling for a PSS. His is the old style with the 24" barrel, flat cut muzzle and 45 degree crown. His also had the parkerized finish. I believe this rifle may be as old as the mid 1980s.

Scott <>
USA - Thursday, December 17, 1998 at 13:39:55 (EST) 

PSS with 5R bbl.s, I don't know how many were made on purpose as a standard item. If you look at the bore of the rifle you will see an obvious difference between the two. For one thing 5 groves versus 6 on the standard. Mine was strickly a Custom Shop thing and not a normal order item. Lets face it Reminton wants to sell the M24's and if you have a PSS with a 5R bbl your pretty close for about $2,000.00 less.

Calif USA - Thursday, December 17, 1998 at 14:29:32 (EST) 

The 5r rifling profile is basically radiusing the intersection between land and groove, I think it's like a 110 degree radius. H-S Precision uses a similar process which they call the 10x rifling, but we like the six groove design, 75% land 25% groove. I like the idea of radiusing the corners because it not only helps on fouling, but it creates a tighter seal between the bullet and the bore, therefore better velocity and a smoother ride. Hope that helps ya out.
Jeremy O'Neal <>
rapid city, sd USA - Thursday, December 17, 1998 at 22:34:44 (EST) 
Great post!

Is that polygonal, for lack of a better word, rifling along the lines of the Whitworth configuration, or more like the H-K, Lothar Walther, or post WW-II(stG 43?) profiles? The Soviets are noted for "borrowing" ideas from other nations.

I can see that you will be providing some REAL good techie info.

CCCCOLD-CITY, BY-GAWD USA - Friday, December 18, 1998 at 09:44:14 (EST) 

To those who know about the PSS with the 5R barrel:
I never heard of these barrels before you guys mentioned them. I read one message that said they were 24" barrels with uncrowned muzzles. This gun is put away for the winter and is kind of hard to get at it now to check the number of grooves. My PSS is parkerized, has a 24" barrel and an uncrowned muzzle so now I'm wondering if I have one of these barrels on my gun. My question is: are all the 24", uncrowned, parkerized PSSs the 5R version? I bought this PSS about 6 years ago from a police supply store that doesn't sell to the public. They told me that they don't sell many rifles there so it may have been sitting in storage for a while before I bought it making it older than 6 years. Thanks for your help.
Kodiak <>
USA - Friday, January 01, 1999 at 15:28:36 (EST) 
You wrote:
I read one message that said they were 24" barrels with uncrowned muzzles.

All barrels have a crown, technically. It is where the bullet exits the barrel. Maybe what the writer meant was that the crown was not coned, counterbored, etc. Even a straight 90° cut across the barrel face is a "crown". A crown doesn't have to be fancy to do what is needed. Assume that the bullet is straight in the barrel (large assumption). We want the gases to vent evenly around the circumference of the bullet base as it breaks seal with the crown. You probably already know this.
Ron N. <>
USA - Saturday, January 02, 1999 at 15:07:51 (EST) 

Let's drag up the 5r barrel stuff one more time. Is there a way with the naked eye to tell if a barrel is a 5r? Have my eyes pealed, but still confused what their pealed for.
Bolt <>
USA - Sunday, January 03, 1999 at 13:16:23 (EST) 
Bolt - Count the radials (Technically not lands and grooves). Normal barrels are even numbers I believe. In a 5R barrel there will be 5 "lands".

See ya.
Gooch <>
Elk Garden, WV USA - Sunday, January 03, 1999 at 15:19:28 (EST) 

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