1, Gold Match rear sight is plastic, regular 5.1 rear sight is metal.
2, Slide moving smoother than the regular 5.1.
3, Nozzle is sitting a bit too far after push bb in chamber, bb may fall out from barrel when muzzle tip down during cocking the slide. You may have to adjust the hop up and file shorten the front of the nozzle a bit will fix this issue. Same problem I had on my old 4.3 version.
5.1 Gold Match - New Parts
The little screw holding a metal piece for reinforced slide stop, tie it up or add small amount of glue to hold it in place. That could be loose and miss the catch.
Further more, after awhile you may find the slide loose a bit too. It is because this metal piece is starting to wear and off track. That also effect the trigger pull not function properly. I applied thin layer of blue glue to increase the thickness and fill the gap, now it works great. But how long can it last? Duno yet.
This is the Marui 5.1 latest regular slide, it shows the empty space without the reinforced slide part
Red arrows are the area apply glue, blue arrow is the screw holding the metal piece. When the screw is loose, also the metal piece too, then the slide stop may not lock when mag is empty, even the trigger for firing may not work properly too.
