CMMG 22LR conversion kit for AR platform (5.56/.223). Includes bolt, bolt hold open follower and six magazines. The magazines have had the newer generation springs and followers so to work with the BHO attachment. I'll send the original springs. New this is selling for around $250. All parts work well, it sure makes it cheap to shoot an AR. I am asking $175 shipped. I'll throw in a the 600-700 rounds of 22LR in the safe, no good to me now.