First: get rid of that stupid trigger. If he is adamant enough to place a warning, there must be something inherently wrong with it.
Second G35;s were nothing more than a G34 in .40 S&W. Or a G22 with a longer slide and barrel. In fact the G35 slide will fit right on a G22 frame. The reason why they have the cutout in the slide is so the slide weighs the same as a G22 slide, and thus all the internal parts recoil spring etc. work. Nothing special here.
The only other difference is the extended Slide Release and the Connector which is set up as a 3.5 lb. Pull. The normal connector in most Glocks is a 5.5 lb connector. The difference in the connectors is the angle that the tab at the rear is canted. The end of the trigger bar (the curved portion) runs against that tab and the flatter the angle, the easier the trigger pull is. That's the only difference. All the springs are the same.
Brownell's sells a reduced power Spring Kit that includes the Firing Pin Spring, the Trigger Return Spring and the Firing Pin Safety Spring. It reduces the pull about .5-1 lb. I had one and it wore out in about 500 rounds. Stock Springs work right.
There is little to be gained with messing with Stock Glock Parts. The most gain can be had by simply shooting the hell out of the gun and learning how to use it. Front Sight is a good place to learn to shoot them.
www.frontsight.com
I put a 5.5 lb connector (G17/19/22/26/27 and most every other one, in mine and learned how to operate the trigger. It took a while but I have 4 Glocks and the triggers are all identical on them, except my newest G23 which hasn't really gotten broken in. It takes 800-1000 rounds to properly break a Glock in, and the G23 will be just like the others soon.
I am telling you all this because after 15+ years of shooting these guns (my G35 was my first) I can say with out a doubt that aftermarket parts, trigger jobs, polishing internals, blah, blah, blah, are pointless and only reduce the service life of those parts. A good way to spend lots of money of things that won't improve you shooting one bit.
You will get about 5000-10000 rounds out of the stock trigger parts as long as you don't mess with them. you will be lucky to get 500 rounds out of polished parts. Been there and done this numerous times until it finally sunk in thru Osmosis . I managed to ruin 4 Trigger Bars before I got the message, average life 200-300 rounds. I dry fire that much in one week!
Light connectors cause Mashing or Shooting Low to the Left and thus the 5.5 lb Connector is the way to go.
Aftermarket Barrels end up in the bottom of the range bag as mine did, due to malfunctioning way too many times on IDPA stages and costing me places due to premature reloads caused by the malfunctions. That didn't take as long to sink in as I had already changed out the other aftermarket and polished parts.
All my Glocks have the same setup parts. They are:
1. Extended Slide Release from a G35 they fit all the guns except the G36 which has a narrower frame.
This helps with locking the slide back or dropping it during malfunctions and clearing the gun at the end of a stage.
2. Extended Mag Release, which helps with dropping the magazines.
3. Better Sights. I have Dawson Adjustables on the Rear and a Dawson Green Fiber Optics on the front. The Green shows up best in the sunlight.
Tritium Night Sights one the G36 and 23 as they are more about SD.
4. A Clean Gun! Glocks will run way into filthiness. However if you Deep Clean them (take the gun completely apart and clean and lubricate every single part) at least every 400-500 rounds you will have less problems with worn out parts. I have seen guys who refused to clean the gun until it malfunctioned too often. You couldn't even touch the gun without getting your hands filthy. They will still operate like that, you just have to decide if you really want that.
These guns are as close to perfect tools out of the box as anything in existence. They should be looked at as "tools" not "guns." In that context anyone will be satisfied.
Randy