Snowdog
Member
- Joined
- Dec 24, 2002
- Messages
- 4,608
Everyone's under the impression a pistol with a locking breech is inherently stronger than a pistol that's a blowback... but is this true, and if so, do most understand why?
Here's what I know: A locked breech allows for rearward travel of the barrel/chamber which is mechanically locked with the breech face/slide (I believe known as dwell travel) under the inertia of the bullet traveling through the barrel, thus allowing "dwell time" which buys enough time for the pressures in the chamber to decrease. Therefore, by the time the extractor begins to pull the casing from the chamber, the brass is no longer hugging the chamber walls as tenaciously as it was during the dwell travel.
Here's what I don't know: Why exactly do these pressures need to decrease?
Here's what I think: Primarily to aid in extraction.
I'm under the impression the principal advantage of the locked breech design is to ensure easy extraction of spent casings. Certainly it isn't to keep the case from rupturing...or could it? After recognizing the success of various manufacturers that use blowback actions chambered in serious cartridges such as 9mm, .40S&W and .45acp (Highpoint, for one), I’m am cautious of assuming there are dangers of casing failure without the breech being locked.
Sure Highpoint must pay for this by having a massive slide, but they manage to get it done.
So, the only obvious reason I see for having a locked breech is for proper extraction... but I really feel I'm missing something.
I have other questions concerning blowbacks, but I will form a separate thread rather than inundating the thread with multiple questions.
Thanks in advance!
Here's what I know: A locked breech allows for rearward travel of the barrel/chamber which is mechanically locked with the breech face/slide (I believe known as dwell travel) under the inertia of the bullet traveling through the barrel, thus allowing "dwell time" which buys enough time for the pressures in the chamber to decrease. Therefore, by the time the extractor begins to pull the casing from the chamber, the brass is no longer hugging the chamber walls as tenaciously as it was during the dwell travel.
Here's what I don't know: Why exactly do these pressures need to decrease?
Here's what I think: Primarily to aid in extraction.
I'm under the impression the principal advantage of the locked breech design is to ensure easy extraction of spent casings. Certainly it isn't to keep the case from rupturing...or could it? After recognizing the success of various manufacturers that use blowback actions chambered in serious cartridges such as 9mm, .40S&W and .45acp (Highpoint, for one), I’m am cautious of assuming there are dangers of casing failure without the breech being locked.
Sure Highpoint must pay for this by having a massive slide, but they manage to get it done.
So, the only obvious reason I see for having a locked breech is for proper extraction... but I really feel I'm missing something.
I have other questions concerning blowbacks, but I will form a separate thread rather than inundating the thread with multiple questions.
Thanks in advance!