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For which firearm?
Wherever you need to. If you're in a field environment, just don't take out the firing pin or extractor, for the sake of not wanting to lose that tiny extractor pin or the small cotter pin which holds the firing pin in place.
Bolt and bolt carrier group
You need a gunsmith
The bolt carrier, the firing pin, the carrier pin, the extractor, the cam pin, the bolt, the extractor retaining pin.... that's the assembly, but the charging handle is also defined as part of the bolt carrier group.
firing pin , breech block, and extractor and ejector mechanism
Trigger with trigger bar, trigger spring, connector, trigger housing with ejector, locking block, slide stop, magazine catch, magazine catch spring, slide lock, slide lock spring, locking block pin, trigger pin, trigger housing pin, Frame, Magazine tube, magazine floor plate, magazine spring, magazine insert, magazine follower, front sight, extractor, rear sight, firing pin channel liner, extractor depressor plunger, extractor depressor plunger spring, Spring loaded bearing, spring cups (2), Firing pin spring, firing pin, firing pin spacer sleeve, slide cover plate, firing pin safety spring, firing pin safety, barrel, recoil spring assembly, 36 parts unless I missed one.
Rings, extractor/ejector, firing pin. forearm
Primer.
Sometimes. The firing pin and extractor may leave marks on an ejected shell that can be matched to a gun.
Clear the pistol of all ammunition, remove magazine. Remove slide. Press extractor pin out with a pin punch. This will release extractor and extractor spring. Insert extractor spring and new extractor, press into place, hold while reinserting extractor pin. Or replace it- a new one costs what a gunsmith will charge to repair one.
hey, I'm gunsmith in Darlington SC. there is a cross pin called the firing pin retaining pin. its under the extractor which is held in with a pin through the top of the slide. the retaining pin on spring loaded (inertia) firing pin is usually loose fit and shouldn't be hard to get out. pushing the firing pin forward to take spring tension off the retaining pin may aid in getting it out but like all things nothing is ever as easy as it should be. good luck , i have one driving me up the wall too. Jonathan Hudson of Hudson Arms