As long as you are on 200.7 or older version of Unleashed, you can use AC wave-1 APs but upgrading to 200.8 will not support 802.11ac wave-1 APs (R600 is 802.11ac wave-1 AP).
Check the Release notes here
for 200.7 and here
for 200.8. Refer supported AP.
Syamantak Omer | Community moderator | Sr.Staff TSE | CWNA | CCNA | RASZA | RICXI