Need a little help with my first Swiss Arms

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wildphil24

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Hi guys,

I resisted a few years but finally I got a nice Classic Green on a trade. All my military guns were made in USA so I learned the Swiss pattern by handling and manual reading. A few questions still unanswered, until we get a stickie on SAN FAQ...

1) On the bolt carrier, barrel and the left side of the upper and lower, there's the same sign: "NB (inside a reticle) 09". Does it mean it was made in 2009 in the shop of NB? Where is NB?

2) My manual says it's caliber is .223. Since this is a military rifle, is it a NATO chamber with a manual for civilian or what?

3) There's no marking on the barrel other than NB 09. The manual says the SG550-1 SP is rifled 1-10 and the SG550-2 SP is rifled 1-7. I don't have the box. From the reading I made here, 1-10 is much more common and 1-7 arrived lately but I'd like to know for sure. How to figure which rifling I have?

Thanks a lot,
Philippe
 
I can only help with the rifling twist. Make a little flag on your cleaning rod with a piece of tape (roll it around the rod and stick the two ends together sticking out about 1") put your brush on the rod and push it into the barrel until you feel a little resistance, measure the distance of the flag from the chamber, now push the rod until the flag makes one revolution, now measure the flag from the chamber again, if it lost 10 inches its 1/10 if it lost 7 inches its 1/7

The gun shops that sell these rifles sell most users 5.56 ammo for them so I would bet its NATO spec chamber, just a hunch.
 
European made guns do not use SAAMI specs they use CIP. In Europe there is no .223 vs 5.56mm debate. Your rifle can use both interchangeably.
 
1)Nobody knows what these "NB 09" sign stands for? I'll have to contact an importer I guess.

2)So I'll shoot some NATO load too. Good! :)

3)Thank you guys. I didn't get the chance to measure the twist (with my cleaning rod) because I had my range officer exam tonight but I'll do shortly.
 
I would not rely on anything most of the sales folks tell you about the twist rate of your barrel (with the exception of a very, very select few folks)...in the past I have been assured a SAN rifle I was purchasing from a reputable dealer had a 1 in 7 barrel and, after it did not perform the way I was expecting with longer, heavier bullets, measured it very carefully to discover it was 1 in 10.

Any of the true 1 in 7 barrels I've measured are threaded on the interior of the flash hider. I do not know if there are 1 in 7 barrels that don't have the interior flash hider threading or conversely if there are any 1 in 10 barrels that do have the flash hider threading, so I guess the only way to know for sure it to measure.

Brobee
 
I have a 1:7 with the interior threading. But I was wondering, what is that threading designed to accept? Or is it just a marking?
 
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