I've owned 4 G&R's thru out the past 12 years. Upgrading since the first purchase. I had the one with factory headphone speaker jack (volume up/down) on the front lower right corner. Actually, when I first saw the game for sale... I couldn't believe someone cut into the cabinet and installed it. Only to learn later, it was fairly rare with approx 100 made. I sold it for a nicer one.
My current G&R has all black rails. I actually owned 2 at the same time, and swapped the black rails into my keeper game. I prefer the look much better all black. I had a small issue the ball occasionally not making it all the way up shooter ramp. That was solved by reducing the coil wrap wire.
I added an internal amp, upgraded both back box & base speakers. This game ROCKS! I've added a few Pinbits items too. I do really like the wooden gun handle... maybe a little Christmas gift for myself.