10/20 Magpul 223/556 Gen M3. Comes with open retail packaging. A rivet has been installed, to only allow 10 rounds in the magazine.
NOTE WHEN LOADING THE MAGAZINE IN THE RIFLE YOU WILL HAVE TO GIVE IT MORE OF A HIT TO FULLY SET IN THE MAG WELL. THIS IS DUE TO THE 10TH ROUND BEING TIGHT IN THE MAGAZINE. TO ALVOID THIS YOU CAN LOAD 9 ROUNDS INSTEAD OF 10 ROUNDS. OR HAVE THE BOLT FULLY BACK BEFORE LOADING.