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1. Is the muzzle device oem?
Yes. This device is OE to the Sig SWAT model that you have. It is sort of a facsimile of the AAC 51t flash hider. No idea who made these.

2. Why does it have the AR "cage" on the lower as opposed to being smooth like the others?
??... Are you referring to the AR type magwell? Because AR mags are plentiful and inexpensive, and Sig USA thought people would not want to invest in proprietary mags.

3. Which handguard is this?
SWAT model aluminum handguard.

4. is the gas tube and gas selector stainless on this model? ( My other one had a nitrided gas tube).
Fairly certain the selector is SST, but I believe the tube is simply coated carbon steel.
 
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