Not entirely sure, since I don't have a Ruger precision, but the MDT 5.56/.223 mags fit in my Savage Axis II Precision, just like the Ruger AICS ones do (my Savage came with an obvious Savage AICS mag - I wasn't gonna spend $90 on another Savage, so I bought a couple of Ruger AICS, which fit well, but then I found the MDTs, which were significantly cheaper and have been amassing those). Given that the Ruger and the MDT both fit into my Savage and work fine, I will suggest that the MDT ones will fit your Ruger AICS. If I remember correctly, my Ruger AI mag was designed for the Ruger Precision Rifle and Ruger Scout Rifle (and obviously fits in my Savage Precision rifle)