SGW Car-AR barrel assy?

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SGW Car-AR barrel assy?

Postby ID_shooting » Thu Apr 16, 2015 5:13 am

browsing LGS who is a bit of a brand snob and found this. He was going to assemble it into a quick $500 gun show sale but I talked him out of it fairly cheap to do my A1 car-15/XM177 build/impression I have been wanting to do for some time.

I think it is a pre-ban SGW Car-AR barrel assembly. Only markings are 5.56 right in front of the FSB. heavy profile, appears to have chrome chamber/bore.

Sooo, to the guru's, Am I correct? Any Idea about twist rate? Will the Oly gods come smite me if I turn the barrel down to a Colt "light-weight" profile?

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Re: SGW Car-AR barrel assy?

Postby Globemaster » Thu Apr 16, 2015 12:47 pm

I'm not convinced that the barrel in question is an Olympic Arms barrel; as there is no OA's mark on the barrel extension; and the 556 markings don't look to be OA's either; and the 'Forward Sight Base' looks suspect too.

if it was an OA's chrome-lined barrel, the barrel would have this type of mark; as I have (2) OA's barrels w/ Dura-Chrome™ lined markings, and they are both marked like this Olympic Arms® mark below.

and just so you know 'Pre-BAN' has nothing to do with the barrel assembly; only the lower receiver, is affected by the term 'Pre-BAN'


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Re: SGW Car-AR barrel assy?

Postby ID_shooting » Thu Apr 16, 2015 4:57 pm

was thinking more time frame rather than what it means to a serialed receiver. like the one in this post:

http://www.oa2.org/Forum/viewtopic.php?f=12&t=14424
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Re: SGW Car-AR barrel assy?

Postby Globemaster » Thu Apr 16, 2015 5:15 pm

I’m not sure I’m following you, as the thread that you linked, has to do with a ‘complete’ carbine … can you tell me more about what your referring to; so maybe I can better understand your view.
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Re: SGW Car-AR barrel assy?

Postby ID_shooting » Fri Apr 17, 2015 3:45 am

i am trying to find the maker of the barrel to figure twist rate and want to ensure there is no concerns with turning it down to leight weight profile.

The closest i could find to match visually is an old SGW 1980's era car-ar.
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Re: SGW Car-AR barrel assy?

Postby Rattler » Fri Apr 17, 2015 8:57 am

Here are my thoughts: Good chance it's an early Olympic Arms barrel, but would be hard to say with 100% certainty.

In Olympic's early days, the SGW years, Oly did not manufacture barrel extensions or front sight bases. FSB's came on pretty early, but like 1987 when Oly acquired their casting facility down in Costa Mesa, CA. Barrel extensions did not come along until the early-1990's. That said, not having the barrel extension marking/stamp, and not having a cast front sight base (good catch on both, GM!!) doesn't put me off.

Remember, in those early days, there weren't many people making barrels. As a matter of fact, it was Colt and Olympic Arms - that was it. Even after Bushmaster and DPMS got into the game, they purchased their barrels from Olympic Arms. At least a large portion of them. The flash hiders were crude, and 'squared' looking at that time also. The stampings are consistent with Oly manufacturing at the time, and with so few other companies making barrels then, my gut tells me this is probably an Oly Arms barrel, which means it is likely a 1x9 twist.

It is somewhat comical however to have so many people curious about their barrel's twist rate, and think they have to call the manufacturer to fins out what it is. We get call almost daily from people who cannot figure out what their barrels twist rate is. If you have a cleaning rod, patches, a magic marker and a ruler, you can find out on your own. Take your cleaning rod with patch attached, and insert it into the barrel from the muzzle. Yes, this is inconsistent with cleaning but it will not damage your rifle's barrel. Shove the patch all the way back to the breech or chamber area. Leave the bolt closed on your AR (or bolt gun, and when the cleaning rod impacts stop. Leaving the cleaning rod on the barrel, take your Sharpie/magic marker and make a tick mark or arrow on the top dead center of the cleaning rod right at the muzzle. Once you have marked the cleaning rod so that you know where you started at the muzzle and can identify the top dead center of the rod, slowly begin to pull the cleaning rod out. With the patch engaging the rifling, you will see the cleaning rod start to rotate. As it slowly rotates, keep pulling the cleaning rod out until the tick mark rotates fully and is once again in the top-dead center of the rod/barrel. STOP pulling on the cleaning rod, and using your ruler, measure from your tick mark on the rod, back to the muzzle. This distance is your twist rate. If you measure 9 inches, (since your rod only made one revolution) you have a 1x9 twist rate. If it measures 7", you have a 1x7 twist rate. Etc, etc.
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Re: SGW Car-AR barrel assy?

Postby Globemaster » Fri Apr 17, 2015 3:17 pm

Rattler wrote:Here are my thoughts: Good chance it's an early Olympic Arms barrel, but would be hard to say with 100% certainty.

In Olympic's early days, the SGW years, Oly did not manufacture barrel extensions or front sight bases. FSB's came on pretty early, but like 1987 when Oly acquired their casting facility down in Costa Mesa, CA. Barrel extensions did not come along until the early-1990's. That said, not having the barrel extension marking/stamp, and not having a cast front sight base (good catch on both, GM!!) doesn't put me off.

yup, I only know of what I've learned here on the OA2 board; and someday; I'd like to find a sanitary 'um-molested' SGW carbine.

just like this one :mrgreen:

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Re: SGW Car-AR barrel assy?

Postby ID_shooting » Sat Apr 18, 2015 4:31 am

hench why I am trying to do my homework befor I alter this barrel. My goal is an xm177 clone build but pencil barrel and an old aimpoint. Think mid 90's SOCOM style. this is why I am checking in here befor I strip this thing down and spin it in a lathe.
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