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ThunderCactus · February 22nd, 2014, 01:17

So after a few hours of tweaking and fixing

It's a $4500 FCC race rifle, and also a fucking joke.
My buddy bought it for $1000 and he STILL OVERPAID.

The bolt catch is loose between the posts, so a .5mm shim needed to be inserted with it. While loose it would rock so far that the mags couldn't activate the bolt catch button.

The motor had blown the UPPER bearing, and was on it's way to blowing the lower as well.

His initial problem was the motor simply screeched yesterday when he tried the cylinder I had regreased for him. As shown in the video the motor hole was cut 1mm too large and not only allowed for side to side slop, but it's also cut 1mm OUT OF CENTER. So it's even more difficult to get it to mesh properly. Ended up shimming the boss on the motor head and raising the pinion as far up as safely possibly and taking up enough of the play for it to be safe.

The bearing hole in the planetary gear cap for the sun bearing was too tight and compressing the bearing to failure. I ground about .003" out of the diameter and it was STILL too tight. used a bearing press to safely install the bearing and immediately upon install it the bearing was grinding.

However I can say one good thing about this particular FCC gearbox, the gear spacing was actually done properly. No excessive lash between gears and no accelerated wear. So at least they did ONE thing right.

Check the FCC hop chamber as well, they have a large diameter roller in there, glued down properly, pin isn't centered in the adjuster; it was sticking out the side a bit, they did a poor job of cutting the roller but he says the accuracy was good anyway.

So basically, $4500 rifle, needs a new lower receiver, 2 parts replaced in the gearbox, and a new motor.

February 22nd, 2014, 01:17	#119
ThunderCactus Not Eye Safe, Pretty Boy Maximus on the field take his picture! Trader rating Join Date: Feb 2007	So after a few hours of tweaking and fixing It's a $4500 FCC race rifle, and also a fucking joke. My buddy bought it for $1000 and he STILL OVERPAID. The bolt catch is loose between the posts, so a .5mm shim needed to be inserted with it. While loose it would rock so far that the mags couldn't activate the bolt catch button. The motor had blown the UPPER bearing, and was on it's way to blowing the lower as well. His initial problem was the motor simply screeched yesterday when he tried the cylinder I had regreased for him. As shown in the video the motor hole was cut 1mm too large and not only allowed for side to side slop, but it's also cut 1mm OUT OF CENTER. So it's even more difficult to get it to mesh properly. Ended up shimming the boss on the motor head and raising the pinion as far up as safely possibly and taking up enough of the play for it to be safe. The bearing hole in the planetary gear cap for the sun bearing was too tight and compressing the bearing to failure. I ground about .003" out of the diameter and it was STILL too tight. used a bearing press to safely install the bearing and immediately upon install it the bearing was grinding. However I can say one good thing about this particular FCC gearbox, the gear spacing was actually done properly. No excessive lash between gears and no accelerated wear. So at least they did ONE thing right. Check the FCC hop chamber as well, they have a large diameter roller in there, glued down properly, pin isn't centered in the adjuster; it was sticking out the side a bit, they did a poor job of cutting the roller but he says the accuracy was good anyway. So basically, $4500 rifle, needs a new lower receiver, 2 parts replaced in the gearbox, and a new motor.