1911 small radius firing pin stop ... helps reliability?

[Lead Waster]

Hi guys! I had read up a bit on small radius or “flat with just a broken edge” firing pin stops on a 1911. I wanted to keep the extractor on my TRP from ever so slightly clocking (heck I should probably buy a new extracted too) so I figured I’d try and fit an egw oversized FPS into it.

Is it just internet mumbo jumbo or does a small radius FPS actually help reliability by giving the slide some extra resistance to movement and thus slows it down a touch so the magazine spring can catch up?

Thanks for the opinions!

[shafferds]

It's all about timing and yes I can help but also comes down to how everything is setup. Have a reliability package done if you have issues. The firing pin stop won't fix it all. Egw makes great products around 22.00.

[ojisan]

The lower on the hammer that the FPS lowest edge contacts the hammer, the less leverage the slide has on the hammer spring.
A square lower corner can be used to help hold the slide shut a little longer and slightly slow it down on something like a hot 10mm load.

Raising the contact point by rounding the corner various amounts makes it easier to push the hammer back against the hammer spring.

How you set up the FPS, recoil spring and hammer spring should be matched to the loads you are shooting.


Check out the info here:

https://americanhandgunner.com/cammer-hammer/

[Fatcat]

The lower on the hammer that the FPS lowest edge contacts the hammer, the less leverage the slide has on the hammer spring.
A square lower corner can be used to help hold the slide shut a little longer and slightly slow it down on something like a hot 10mm load.

Raising the contact point by rounding the corner various amounts makes it easier to push the hammer back against the hammer spring.

How you set up the FPS, recoil spring and hammer spring should be matched to the loads you are shooting.


Check out the info here:
https://americanhandgunner.com/cammer-hammer/

[Lead Waster]

The Cammer hammer is the opposite of what a small radius FPS would do! It would allow the slide to move back with less resistance. The small radius FPS would attempt to provide the slide with more resistance at the beginning of slide movement and rob some rearward momentum which would slow the slide down a touch. It would make manually racking the slide harder. The Cammer hammer tries to do the opposite.

[MosinVirus]

If your extractor is clocking, and the FP Stop is the fix then that is a reliability improvement.

The reduction in speed of the slide or rather the increase of dwell time with the use of the square bottom FP Stop may not necessarily be a reliability improvement. As in it may be an improvement but not necessarily to make the gun more reliable.

And because timing will be affected, it may make the gun less reliable. That is why you may also need to change the recoil spring and/or hammer spring to a lower power one, for example.