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I picked up two during 2009 they were later ones with the newer mags so most of the early issues had been fixed by then... I have about 5k rounds between them with little problem I usually run about 100 rounds through them then run a brush down the bore and add a few drops of oil on the rails. you may need to tighten the barrel nut a couple of times during break in. I brought them home and cleaned them, oiled them, and ran 50-100 rounds of good ammo throught them for break in. I now only run federal 525 bulk pack or thunderbolts NOT rem golden bullets ( they don't even work more than 2 mags in my Ruger MK II)