What does striker fire mean?

Striker Fire: Rather than a hammer, an internal striker is cocked and released to fire. The striker is cocked by the first motion of the slide, and there is no way to decock other than squeezing the trigger.

Not true - HK P7M8 is cocked by squeezing the grip (squeeze cocker), and it uncocks by just releasing it.

Some other weapons have decockers, but some decockers can be dangerous.

I think someone on this forum related a story where the decocker broke and when his dad went to use the decocker the weapon discharged.

That won't happen with an HK P7M8, which is perhaps the most under rated, under appreciated handgun ever invented.

I have owned and fired my HK P7M8 regularly since 1985 and NEVER had one single failure with it - not one. Never failed to ingnite, never a stove pipe or failure ot go into battery or feed.

just perfect.
 
I also don't understand that point. The time it takes for sear/hammer
engagement to break and the time when bullet leaves the muzzle is
instantaneous.

It used to be that with match lock weapons, the time between lowering
of the match and bullet leaving muzzle would be as much as a second.

But who here still shoots match lock weapons?

Not true. In precision bench rest shooting and possibly other match shooting, the lock time of the firearm is considered to be important in achieving top accuracy.
The lock time of modern firearms are not instantaneous, but are measured in milliseconds.
 
So for carrying a striker fire weapon such as an M&P40, what is the safety mechanism?
Modern striker-fired pistols usually have one or more internal mechanisms that physically block the striker from hitting the primer unless the trigger is deliberately pulled. They also usually have a mechanism that prevents the trigger from moving rearwards unless it is pulled in a normal firing motion; on the M&P, this consists of an articulated trigger, while on a Glock, it consists of the (in)famous tab within the trigger, colorfully nicknamed the "dingus". ;) In addition to these features, the Springfield XD series also has a conventional 1911-style grip safety.
 
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