Hi folks,
I was reading a thread a couple days ago about an SKS that was "firing auto" (you've read these from time to time) - a stuck firing pin, or something. Dangerous, with a chance of an out of battery primer strike.
So that got me thinking... when I first joined the Reserves, we still had a couple SMGs (Sterlings?)... When you look at the design of these and other blowback SMGs, like STENs, they were basically a heavy bolt assembly, held back against a spring by a trigger, which when released stripped a round from the mag, chambered it, and fired it. The bolt assembly was heavy enough that the pistol round would have expended most of its energy by the time inertia got that bolt assembly moving backwards, and had just enough oomph left to shove the bolt assembly rearward past where the trigger would catch it, extracting and ejecting the spent casing along the way.
If I picture this bolt assembly as solid, with a pointy pin on the front end, isn't there a chance that a bullet, caught on something on the way to the chamber, could have gone off? On the modern firearms, there's all sorts of sears and timing devices to prevent the firing pin from striking until the bullet is chambered, but was there any insurance like that on these older ones? Or, put another way, how did this fire the round at exactly the time the bullet was fully chambered. Surely there was no thought to "timing" on these old warhorses?
Am I missing something in the design, or have I just never heard of range accidents or wartime incidents of guns blowing up?
I've always been a fan of the "simple is best" theory, and love bolt action, but this mental distraction has survived a couple days, and a couple Internet searches, without an answer
Thanks