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The locking insert sits over the trigger assembly and prevents lubrication. How can I do that after field stripping and cleaning the gun? Insert a needle-nosed applicator through the opening in the front of the insert, though I really can't see in there to see where to apply oil?
There really isn't a whole lot to lubricate there. You can lubricate the trigger pivot pin and the hole in the trigger that it goes through, and the trigger bar pin that inserts in the trigger, and the hole in the trigger it goes in. I don't think these areas need to be lubricated very frequently.
If you feel the need, then remove the take down lever by pulling it from the left side of the frame, as you rotate it counter-clockwise. After you have that out, you can remove the locking block insert by pulling it upward and forward toward the muzzle end of the frame. Be careful not to lose the slide catch lever spring that inserts into the left side of the locking block insert.
If you really need to clean these parts up you can remove the trigger and trigger bar. With the right sided grip off, remove the trigger bar spring and let the back end of the trigger bar drop. You can push the trigger pivot pin partway out the right side of the pistol to free up the slide catch lever and lift it out. Then take the trigger pivot pin all the way out and you can pull the trigger and trigger bar up out of the frame. As you remove the trigger pivot pin, take note of the orientation of the notches in it.
Completely removing and replacing the trigger and trigger bar requires some jiggling and fiddling to get it back in place. Ferrari Steve has some good videos on youtube. No force should be required.
When replacing the trigger pivot pin the notches must be properly oriented. The "screwdriver notch" on the left side of the pin must be horizontal as the locking block insert is replaced and can be reoriented as necessary using a small standard screwdriver. The slide catch lever must be properly inserted and the left side of the trigger pivot pin captures it. As the locking block insert is replaced check the orientation of the trigger pivot pin and make sure the front of the slide stop lever is flush up against the inside of the frame. Make sure that the slide stop lever spring is correctly situated on the locking block insert and hold it in place as the insert is slid back into the frame and toward the back, using a motion the opposite of that used to remove it. The take down lever then goes back in using a clockwise "screwing" motion to reinsert it.
Replace the trigger bar spring and right grip and you are done. All of this sounds much more complicated than it really is. Once you have done it once or twice it is all pretty straightforward (except for wiggling that trigger and trigger bar back into the frame).
The only part of the trigger mechanism of my X5 Comp that I'd like to be able to lubricate is the sear-hammer engaging surfaces. I don't know of an easy way to do that ? wish I did.
It is true that steel parts should be protected from rust, seizing up and to impart lubricity and allow the steel parts that touch to move freely against each other.
The problem here is, we don't have enough information about your specific firearm to provide a reliable answer.
1. How old is your gun?
2. How many rounds through it?
3. Did you buy it new?
4. Have you done a detail strip & clean yourself?
5. Has anyone done a details strip & clean?
6. If so, do you know IF they properly cleaned and lubed everything?
There's more of course.
IF your gun was purchased new by you.
IF no one has detail striped it.
IF it doesn't have 2 or 3,000 rounds through it.
IF you don't live in a dry dusty climate or shoot a lot in those conditions.
There are more "IF's".
The point being, a new firearm is not properly lubed out of the box, but a simple field strip, clean and lube will do all that's needed - until the gun has a good number of rounds through it or unless some of the "IF's" above apply.
The major action parts will be properly lubed out of the box, the "rust protections" applied at the factory can be cleaned off with a field strip/clean/lube.
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