some of the original ones had cheap pot metal barrel bushing that would break and fly out causing the loss of the recoil spring and plunger. Happened to me. Blue line took the pistol back and fixed the gun. Apparently all of the new models have a better bushing, also any 1911 steel bushing will fit in the gsg. The rubber recoil buffer also gets pounded flat and mishaped quite quickly. Ive had two pounded out already. This being said the gun has closed to 3000 rounds through it and litterally will not jam no matter what I try, with every kind of 22lr ammo Ive put through it. Shot side by side with a $200 higher priced sig misquito which literally jammed 2-3 times per mag with any kind of ammo put through it (even after cleaning no matter what was tried) the gsg blew the sig out of the water. Also decently accurate and a nicer trigger pull than the sig but apparently not that great compared to most full sized 1911's. I read a post on here about the ambi safety breaking and being made of the same pot metal as the bushing. The sights are plastic and will strip if you overtighten the set screw. The finish on the front of the side wears off rather quickly. Overall a very nice reliable and decently acurate gun especially for the really low price. Just be aware of some of the issues that can happen.