I am wondering if that rail is ION series rail?
https://slrrifleworks.com/ion-16-lite-mlok-handguard/
or may an early gen SOLO, I have SOLO on my 18" SOLGW and it look like this...
https://slrrifleworks.com/solo-16-lite-handguard-mlok/
Regardless, that gunsmith is full of shit, SLR makes nice handguards.
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