I still wouldn't get rid of the SASS Corey. That is....unless you REALLY want the Sig. You can always build another Armalite upper (carbine length) cheaper than buying a whole other complete rifle.
250 (approximately) for the upper.
250 for the BCG
anywhere between 3 and 500 for the barrel (you can even go Noveske......I love their barrels)
a couple hundred for a decent handguard/rail
and you're in for less than a complete rifle. AND.....it's still an Armalite (yeah, yeah....I know what the rest of you are saying. F@#k OFF!)
But then, you have two different uppers (tools) for two totally different situations (engagements).
You'd be surprised about just how many of those SASS rifles are out there. Look around at the rifle range's. How many do you see?