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Recently saw a 716 tread that I like. It’s advertised as a 16” barrel. But the sig owners manual I’ve seen says the barrel is 15.98”. Isn’t that an SBR? It has a muzzle device, but I do think it’s permanently attached.
 

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There is apparently a small leeway allowed in length.
 

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Sig measures barrel length in mm.
Easier to to just make it 406 mm instead of 406.4 mm to make it a true 16" I would imagine.

406mm is shy of 16" by just .0157"
I would have to say that if you need to break out a micrometer to see if a barrel is too short then you gotta be really trying.
 

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Nahh, the Sig 716G2 has a specified 16.0" barrel.
The barrel length has some variable allowance in them. Otherwise they would require a tax stamp.

403420
 

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Yes, I own a 716i. What I posted was the 716G2 spec.
The 716i is advertised at 15.98" or 406mm
The 716G2 is advertised at 16.00" or 406mm.

We know that both 15.98" and 16.00" don't exactly equal 406.00mm.

15.98" = 405.892mm
16.00" = 406.40mm

Sig I'm sure is aware of any variation that the law allows in actual barrel length. As well the 716i does have a threaded barrel just like the 716G2 does.

Just like we know a 350 cu in. Chevy V8 is really 349.85 cu in. Manufacturers round of some values.
 

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Recently saw a 716 tread that I like. It’s advertised as a 16” barrel. But the sig owners manual I’ve seen says the barrel is 15.98”. Isn’t that an SBR? It has a muzzle device, but I do think it’s permanently attached.
The muzzle device is not permanently attached and it is a rifle. If your able to get your hands on one do so because they are close to perfect IMO.
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