| '''Old style''' || Optics: N/A || [[ArmaLite AR-10]] || '''200''' || Original style upper receiver with non-detachable carrying handle, top-mounted charging handle, and no mounting points for optics.
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| '''Railed carry handle''' || Optics: N/A NATO-S mount || || '''400''' || Modified Old Style upper receiver featuring a short length of NATO-S rail for mounting optics.
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| '''SASS Flat top''' || Optics: NATO mount<br/>Affects weapon category<sup>'''[[Maze Customs:Major mods#AR-10 weapon categorization|(*)]]''' || [[ArmaLite AR-10(T)]]<br/>[[KAC M110 SASS]] || '''700''' || Modern upper receiver with a full-length NATO rail and an AR-15 style rear charging handle.