Are you comparing Sig P320 Spectre Comp prices among online FFL dealers and local shops?
Here are some street prices:
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By the way you can build a compensated P320 from scratch.
Make sure to buy the Sig P320 FCU first.
Once you have this, then you can build a custom P320 anyway you want.
The Sig FCU (Fire Control Unit) is the serialized part that requires an FFL background check.
Every other component can be bought elsewhere legally including some very slick aftermarket slides, grip modules, and barrels.