Disassembly of the Remington Model 700-Series firing-pin
assembly is best performed with a spring compressor.
On the Mini-30, the firing-pin
protrusion measured correctly, so I did not have to make any changes there.
For further breech-bolt disassembly, unscrew and remove the two firing-pin
bearing screws (#661) from the front face of the breech block (#97).
Removal of the rear sight and firing-pin
block are unnecessary.
Nothing's stopping you from taking a look inside the firing-pin
tunnel right now to find out why the firing pin failed to drop out as it should have a few minutes ago.
protrusion is set on some of the better automatics so that the firing pin does not connect with the chamber, but almost all revolvers will nick the chamber if dry fired.
Then drift out the firing-pin
retaining pins--there are an inner and outer pin--with a 3/32inch punch, invert the bolt slide, and the firing pin will drop out.
We don't know which schematic you have or where it appeared, but the one in the Remington Field Service Manual shows a firing-pin
retaining pin at the rear of the bolt body.
Nevertheless, I found that replacement parts are available from Numrich (e-gunparts.com), and it appears that the firing-pin
retaining pin can be drifted out and the broken firing pin and spring removed without disassembling the gun.
Trigger action, accuracy, and reliability were improved, allowing Smith & Wesson to remain competitive in the law-enforcement market; and after other service pistols were introduced with a firing-pin
block or drop safety, S&W quickly followed suit.
If you've ever tried to disassemble the Remington Model 700's firing-pin
assembly, you know what a devilish little contraption it is.
After reassembly, the primers were not pierced, but had a large ridge around the firing-pin
dimple that made break-open very difficult.
I have .037 inch of firing-pin
protrusion, and I think this is insufficient, but I don't know the correct length.
On metallic-cartridge models, the firing-pin
screw (#22) and the firing-pin
plate screw (#20) can now be removed.
stop (#5) has a threaded hole in the bottom of the part that will accept a #2-64 screw.