Quoted: Quoted:
I might point out that the M4 is 14.5" and the Sig 551 is closer to 16".
No, the 551 has a 14.5 barrel (the 551 long barrel version LB HAS A 16").
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Not exactly.
You're talking about the Sig 551-1P (1st Polizei variant). The 1P is a law enforcement design and has a 363mm (about 14.25") barrel. The Sig 551-SWAT has the same dimensions (but no one buys it).
There is also the Sig 551 SP (which was modified slightly to meet NATO specifications and is generally the version sold for export but is otherwise indistinct from the 551 LB unless you get the police version of the 551 SP).
You are correct about the 551 LB designation but the terms "Sig 551" and "Sig 551 LB" are interchangeable. (No one uses the LB designation except when ordering the weapon- this is because it is marketed to the general public more widely than to law enforcement, which is pitched on the 551 SWAT, and the 552). There are actually two barrels for the Sig 551 with different twists. Both are right around 16".
Also, be careful because not all countries measure barrel length from the same starting point. :)
[Edited to change the length bit)