TweetI JUST PICKED MINE UP...SIG SAUER M400 AR-15 .223/.556 CANT WIAT TO SHOOT IT.. I ALSO BOUGHT THE 22LR CONVERSION SLIDE WITH IT TO PLINK WITH MY DAUGHTER. INSTEAD OF BUYING A SEPERATE 22 LONG RIFLE I STILL GET TO SHOOT MY AR. I CAN SWAP IT OUT IN 2 SECONDS!