FQ...I didn't realize any of the Sportical models came without a railed gas block. My LoPro does have one and while I normally don't mount any BUIS the couple of times I have they lined up fine.
Gas blocks are easy to change and not all of them are pricey and a buddy of mine put a front sling swivel in his really cheapass plastic Olympic handguard in about 15 min with nothing but a drill, an Uncle Mike's swivel, a black nylon washer and small aluminum washer a lock nut and some JB Weld, looks and works great. I get that the rifle wasn't what you hoped for when you bought it but you have found it accurate and reliable so spend a little time and money to "make it yours". They really are very easy to work on.
Personally I would rather spend the money tweaking a gun I know than sell it in the hopes I find something "better". Then again, why sell? One AR never seems to be enough!