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Recommended fix?
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I like the retainer plate (bottom of pic) vs. the shepherd's crook retainer (top of pic). I have a newer WASR 10 as well, and it has the wire-retainer (shepherd's crook) like the pic on the top. If your WASR doesn't have any retainer, it either come loose and got lost somehow or was never installed to begin with. I can't imagine something like that coming loose inside the receiver and not causing a hang-up or issue with the function of the rifle. The safety lever is what holds both in place. If someone removed the safety lever, it could have fallen out of place or out of the receiver.
Since Century Arms replaces the FCGs on the WASRs, it may have gotten left out. That would surprise me that something like that would get by QC, but stranger things have happened.
ETA: On the installation of the retainers, the wire shepherd's crook (AKA paper clip:-), the wire of the retainer fits in the bottom side of the grove in the hammer pin; the wire is then pressed down on the top side of the grove in the trigger pin, and secured by the safety lever where it passed through the receiver hole on the left side.
Similar process with the retainer plate, except the retainer plate fits in the hammer pin grove from the side; then push it down on to the pin grove of the trigger pin and secured with the safety lever, same as with the wire retainer.
My SAR 1 had a similar wire retainer, but shaped different than the above, and didn't need the safety lever to hold in place; it used the tension of the wire to secure it in the groves of the pins. I replaced that one with the retainer plate, which is less likely to come loose and allow the pins to walk out of place.