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Posted: 11/3/2002 7:00:26 PM EDT
I have friend with a SS ultra match 223 barrel. It was made in the early 90's. It is fluted under the handguard. Is it worth a crap or not? How are they chambered? Any input will be appreciated.
Link Posted: 11/3/2002 7:33:32 PM EDT
Those are known as the SUM barrels and also known to be VERY good and accurate barrels for a bench/accuracy type AR. They will have the tighter .223 SAAMI chamber without chrome lining which will be bad for a general prurpose AR. But if you are building a tac driver, thats a nice start...
Link Posted: 11/3/2002 7:57:39 PM EDT
I have a 20" SUM that is exactly as you state, fluted under the handguards.

It is a 1/10 twist, I believe.

Damn, it is sweet. Tack driver, I love it. Set my personal best of a 1" group @ 100yds with iron sights with it. (I aint all that hot of a shooter)

It is cut to a SAAMI match chamber.

Mine typically eats a steady diet of Black Hills blue box 52gr and 68gr.

That being said, I have fired every kind of ammo under the sun in this thing, WOLF, South African, Q3131A, Winchester white box, etc.... and it has yet to fail to feed, fire, and extract. I have no compaints, for a target grade rifle.

If I was looking for a general purpose rifle, I would rather have a chrome lined bushmaster.
Link Posted: 11/4/2002 12:21:30 AM EDT
Nothing wrong with 1" at 100, most people are using scopes and still telling tales to get that!!
Link Posted: 11/4/2002 1:09:16 PM EDT
Bad very bad because they are made by OLY. My gun came with a chamber that was buldging factory ammo. Sent it back to oly and it took them 14 months to replace it. Very poor products.
PAT
Link Posted: 11/4/2002 1:14:25 PM EDT
Cant entirely disagree with glockfan, but the SUM barrels Scooter is talking about are known to be of very good quality.
Link Posted: 11/4/2002 10:51:50 PM EDT
I've had very good luck with mine. As stated the chamber is 223. Best luck with 52's also.
Link Posted: 11/5/2002 5:15:32 AM EDT
I have a 24 inch OLY SUM made in 1994. Flat top receiver with Redfield Olympic rear sight and Lyman globe front. Using these sights off the bench 5 shot groups at 100 yards = 3/8 inch. Load is Nosler 55 BT, Remington 7 1/2 primer, and 23.3 grains H335. Bullet touching the lands. Pretty good for an AR15.
Link Posted: 11/5/2002 1:21:33 PM EDT
I have one on a 16" CAR that will outshoot every other AR barrel that I have ever owned. I also had a 20" fluted SUM that was much better than the Colt Delta HBAR barrel that I replaced with it. They are excellent barrels. Watch-Six
Link Posted: 11/5/2002 4:13:08 PM EDT
A friend of mine has the 20 inch SUM barrel on a pre-ban rifle and it shoots tight little groups. I have two of their button-rifled models on AR's. They also re-barrel bolt guns and have one of their stainless button rifled barrels on a Remington of mine. I like their AR barrels because they are available in stainless. initially, the one of the early problems with the M-16 was the failure to chrome plate chamber. I feel this way about Ar barrells; for general purposes, first choice Chrome, second stainless, third 4140 or 4150.
Link Posted: 11/6/2002 12:06:16 AM EDT

Originally Posted By ScooterP:
I have friend with a SS ultra match 223 barrel. It was made in the early 90's. It is fluted under the handguard. Is it worth a crap or not? How are they chambered? Any input will be appreciated.



It sounds like it might be a 20" SUM (PCR-1) rifle. Default twist is 1x10. If it is 1x8, it will say so on barrel.

Very accurate and a tack driver. For the money these are excellent rifles.

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