Swiss Arms black special

Lawrence D

Lawrence D

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EE Expired
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SW Ontario
How many twists are there in a Swiss Arms black special?
Is 1 in 7 or 1 in 10? How can you tell?

Some people say certain models are great for heavier bullet (65 or 75gn). Can some one explain, please?
 
From what I understand (Not an expert), if you look inside the opening of the flash hider it will be threaded for a BFA at the interior mouth (Blank firing apparatus). This is because the 1/7 was designed for the North American market, where select military and, or Law enforcement agencies have requested that feature when trialling the rifle. I know the 1/7 I used to own had the threads and the 1/10 I have seen did not have that feature. That's the only difference I could tell.
 
Luqid_Snake said:
Correct

but you can speical order a 1 : 7 twist barrell for lots of coin :)
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LOL. You realize you are informing the fellow that does the ordering do you?

The cost of the Sig barrels are not out of line compared to any other barrel out there, especially when you consider the flash eliminator is machined with the barrel (one piece) and they come complete with the gas manifold.
 
beltfed said:
LOL. You realize you are informing the fellow that does the ordering do you?

The cost of the Sig barrels are not out of line compared to any other barrel out there, especially when you consider the flash eliminator is machined with the barrel (one piece) and they come complete with the gas manifold.
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Two days ago, I was told by TSE that it would be in the 900$ field for the whole job. Not that bad.
 
I stand corrected. I don't think I paid that for the two 1:7 twist barrels I bought off of them -that was a couple of years ago though.
 
I have no idea what it would cost but 900 seems fair to me ... Mine came with a 1:7 so I can use steel core with it. Not that I can get my hands on any SS109 ammo
 
Yehen said:
how can you tell what the twise rate is?
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If the owners manual doesn't tell you, or if it's an add-on manual that may not be specific to your particular submodel of gun, there is a way you can calculate the twist.

Take a cleaning rod, put a slotted jag/patch on the end, just as if you're having it cleaned. Put it in the chamber of your barrel. It's much easier to measure if you PULL the rod out of the muzzle end.

Put a reference mark (I like to use a piece of tape doubled over as a "flag") on the rod and note it's starting position. Slowly pull the rod thru the bore and notice how many rotations the "flag" or marking makes. Compare this to the length of your barrel.

For example, with a 20" barrel (and 1/9 twist), the flag/mark should rotate just over 2 complete rotations (20" divided by 9' twist equals 2.2 turns to be exact). With a 1/7 twist, you'll get almost three complete rotations (20 divided by 7 = 2.9 rounded up).

You have to take much care in measuring, or you'll get inconsistant results. Also, this method isn't a good one for short barrels as there is a far more margin of error. For instance with a 10" barrel (1/7" twist) you'll get 1.4 rotations. For the same 10" barrel (with say a 1/9 twist), you'll get 1.1 rotations. It's hard to tell the difference when looking at your cleaning rod while it's spinning:redface:

Maybe we can hit the government up for a billion dollar research grant to invent a machine that does this more scientifically!;)
 
Why not buy a 1/7" classic green from TSE or the EE, then swap the barrels with a 1/10" black special - then resell the classic green with the 1/10" barrel in it?

Requires a bit of capital to own both guns at once, but I bet you don't lose $900 on the difference between a 1/7 and a 1/10 classic green.

Just a thought. I just picked up a 1/7 from the EE, so I am happy :-D
 
sorry, i'm new to rifles, and i would also like to pick up a swiss arms rifle. does the twist in the barrel make a huge difference in accuracy? durability?
 
florin79 said:
sorry, i'm new to rifles, and i would also like to pick up a swiss arms rifle. does the twist in the barrel make a huge difference in accuracy? durability?
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The 1/10 barrels are optimized for Swiss GP90 ammo, which has a 63 grain bullet. So, rest assured that the 1 in 10 barrels are ideal for the 55 grain and 62 grain stuff that is commonly available. Check out the specs on the Swiss Arms 550-1 Sniper..... see the twist rate? 1 in 10.

There's 1 in 7 fever sweeping the CGN forums lately, when it comes to full-length SAN rifles. I just don't get it.
 
Unless you are going to shoot bullets over 69gns, the 1 in 10 is fine. My 1 in 10 also shoots 62gn IVI very well. If you're stuck on 77gn match bullets then you need the 1 in 7, otherwise don't worry about it.

There is also the potential that a 1 in 7 will wear out faster than a 1 in 10. Remember, where accuracy really counts, in Switzerland, they shoot 1 in 10's.

Rich
 
UncleWalther said:
The 1/10 barrels are optimized for Swiss GP90 ammo, which has a 63 grain bullet. So, rest assured that the 1 in 10 barrels are ideal for the 55 grain and 62 grain stuff that is commonly available. Check out the specs on the Swiss Arms 550-1 Sniper..... see the twist rate? 1 in 10.

There's 1 in 7 fever sweeping the CGN forums lately, when it comes to full-length SAN rifles. I just don't get it.
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thanks for explaining that to me :) makes a lot more sense now ! :wave:
 
UncleWalther said:
The 1/10 barrels are optimized for Swiss GP90 ammo, which has a 63 grain bullet. So, rest assured that the 1 in 10 barrels are ideal for the 55 grain and 62 grain stuff that is commonly available. Check out the specs on the Swiss Arms 550-1 Sniper..... see the twist rate? 1 in 10.
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Rich LPS said:
Remember, where accuracy really counts, in Switzerland, they shoot 1 in 10's.
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Yes, but they optimized it to shoot up to and including 300m...not beyond that....


UncleWalther said:
There's 1 in 7 fever sweeping the CGN forums lately, when it comes to full-length SAN rifles. I just don't get it.
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If you are going, or may want to go longer (bullets and distance) the 1:7 is a definate advantage.
If you have shot competitively beyond 300m you would know that advantage can be huge.
 
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