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Posted: 6/16/2010 2:48:30 PM EDT
| DD has a barrel that says its button rifled. Just wondering what that is. |
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It is one of the most common ways to add the rifling(groves) inside the barrel.
You have cut rifling or single point cut rifling which is where you use a machine to cut one groove and a time. Cutting all of the grooves in one pass with a broaching bit(think of a saw looking tool) Pressing all of the grooves in and once with a tool called a button(hince the name button rifling. Casting(flow forming) the barrel over a mandrel. Having a mandrel(arbor) with a reverse image of the rifling and you forge the barrel over/around it(hammer or cold hammer forged) I'm sure I'm missing some ways but Button riffles and hammer forged are the two most used ways. Hammer forged barrels take more to setup but the barrels are cheaper to make once you are setup. Edit: Hell should have just googled and linked that wikipedia article. Says it better then I did. |
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It means it's NOT cold hammer forged.
The 3 basic ways of manufacturing a bbl are: 1. Button = a broach is pushed (pulled) thru a metal blank (rod) to form a tube (bbl). 2. Machined = the lands/grooves are actually cut. 3. Cold hammer forged = the metal is pressed around a blank (rod) which is shaped like the inside of the bbl; when the blank is removed you have a bbl. While CHF is generally accepted as the superior method (due to properties of final product) the first two require relatively inexpensive machinery to produce while CFH requires expensive machinery/tooling, hence the first two are much more common methods. There are numerous accuracy, stress and grain alignment considerations associated with each method, the dis/advantages of which depend on intended use. |
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So as a recreational shooter it basically means if I were to build an AR with a "rifled barrel" it's really not important?
Dont get me wrong, it's just I enjoy building them more than shooting them, I just want to build another and Bravo Co. has these on clearence. Is there any benefit or it's all pretty much the same? |
| Childish stuff is deleting someones post that was helping out a technical forum. If not then " google is your friend" must be an accepted form of "technical discussion" even when linked to Wikipedia. If you think Wikipedia is an acceptable form of technical info, accurate or not, you are WRONG, MODERATOR OR NOT! |
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Button rifling is generally preferred to broach rifling as it produces a bit smoother, more consistent and generally more dimensionally accurate rifling.
Hammer forged barrels have a small following among a limited nnumber of target shooters as they tend to be smoother with minimal lapping required, but proper stress relieving is absolutely essential. Hammer forged barrels are also a bit more common in Europe. The production machinery is expensive, but is efficient once that investment is made. |
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