School me on Barrel length terminology please old guys

[MarinRange42]

A Taurus 4 inch revolver barrel is measuring exactly 4 inches of barrel before the cylinder, yet the ammunition sits back within the cylinder when fired.

A Glock 19 barrel is considered 4.01 inches. But from the tip of the bullet sitting within the barrel ready for firing, it would seem a shorter measurement consideration correct? From the tip of the bullet to the end of the barrel?

And my Lone Wolf extended barrel is considered 5.32 inches in length, however with the bullet seated from tip to end of barrel is only 4 inches.

What's wrong with this picture....me, the terminology standard or bacon?

As you can visualize from above, I have no visible abs this evening.

Your advice welcomed.

[Army GI]

I don't think it is measured from the tip of the bullet, but from the mouth of the chamber.

I'm not sure about revolvers, but in other guns with bolt or breech faces, it is measured from the breech to the end of the muzzle.



From the video, it appears it is measured from the cylinder face to the end of the muzzle.

[ke6guj]

A Taurus 4 inch revolver barrel is measuring exactly 4 inches of barrel before the cylinder, yet the ammunition sits back within the cylinder when fired.

A Glock 19 barrel is considered 4.01 inches. But from the tip of the bullet sitting within the barrel ready for firing, it would seem a shorter measurement consideration correct? From the tip of the bullet to the end of the barrel?

And my Lone Wolf extended barrel is considered 5.32 inches in length, however with the bullet seated from tip to end of barrel is only 4 inches.

What's wrong with this picture....me, the terminology standard or bacon?

As you can visualize from above, I have no visible abs this evening.

Your advice welcomed.

revolvers are measured by the actual length of the barrel. the chamber within the cylinder is not measured.

with semi-autos, the barrel is measured but that barrel also contains the chamber so they measure from the breach face. they don't just measure the rifled portion of the barrel.

just the way it is.

if semi-autos had a chamber portion physically separated from the rifled barrel portion, then semi-autos would possibly be measured like revolvers, but since they don't, they aren't

[MarinRange42]

Thanks for that. I did some reading. Just seems like semi-auto barrel length terminology is cheating in nature. 4 inch revolver has 4 inches of rifling. A 4 inch semi-auto barrel may not have 4 inches of rifling, because of the seating within the chamber which would not contain rifling. Sure it's old news, but it is new to me. BATF set the standards I now understand.

So Glock 19 has 3ish inches of barrel rifling
So Shield has 2ish inches of rifling??

[lizardpicasso]

Please stop putting thing inside the barrel of your loaded firearm.

[ke6guj]

I don't think it is cheating, in both cases, for a 4" revolver and a 4" semi-auto, if I hand you the piece of tubing that is the "barrel", both will measure to be 4" long, that makes sense to me. I shouldn't have to get a measuring device and measure how deep the chamber is and then subtract if from the overall length of the tube to find out the "true barrel length".

[MarinRange42]

Oh that's good!!!...Not even after 8pm It's the Irish in me I guess...

[LowThudd]

Maybe don't think of it as though 'autos' are different, but rather revolvers are measured different. Barrel length, even on muzzle loaders, was inclusive of the chamber. Still is for modern rifles. The only oddity is when the chamber is separate from the barrel. Then it is measured separately.

[liamettocs]

It's like buying lumber. A 2x4 (nominal dimensions) is something like 1.75x2.5 actual dimensions. I'm sure one of the carpenters on here will correct me if I have the actual dimensions wrong.