Just got my PSA M4 standard carbine. Wow, what a nice rifle. Not bad at all for $600. Fit and finish is very good. Ran 360 rounds through it today for break-in. 200 rounds of Federal .223 and 160 rounds of M855. She functioned flawlessly. Not a single bobble of any kind with the stock magazine and PMags. VERY happy camper here with this one from PSA.