The piece itself is pretty strong, good steel here (not the potty metal used by regular low-cost replicas). I found some problems with JG/Golden Eagle GBBR, you'll have to widen the pin hole a bit to fit the standar pin used in the gun, and the top part (which catches the bolt) needs some trimming or it will not work properly, slowing down the bolt by friction, which is BAD for the gun components an will cause jams. Apart of that it works very well... the stock piece of the JG/GE gun las for only two mags before being unable to catch the bolt.