You raise an interesting issue...if you have the firing pin block in tact, you should be "safe" from unintended ignition, but the issue of sear/hammer hooks is an issue that I've given thought to. The aftermarket hammer hooks are quite short, about 1/2 the length of a 1911. And with the lighter hammer springs some recommend to "improve" the trigger, I've wondered about the reliability of the hammer/sear interface with competition conditions. But it seems to work well and be reliable. However, if you notice that the hammer EVER doesn't fully capture and hold the sear, on cocking or decocking, I'd get it checked out.