Not exactly sure what the intent is, but the JMAC GBC-13 is fairly similar, and probably cheaper.
Mars_Ak
I have owned several gas blocks from each manufacture and both are of great quality. The last JMAC GBC-13 I had cracked upon test firing a new build (probably one off and sent back for a refund from Optic Planet). I recently was able to locate two Meridian Defense FSB 24mm at good deals that I just couldn't pass up.