Throat erosion gage guage-ARA- MOR THROAT EROSION GAUGE | Brownells

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Throat erosion gage guage

Throat erosion gage guage

The lands actually start from the same surface plane as the groves, but quickly taper to full height. This greater wear than normal could be caused by an inconsistency in heat treat, or even from cleaning rod abuse. I then check the Throat erosion gage guage for erosion. And consider this; often a great deal of accuracy can be restored by utilizing proper cleaning procedures and making sure Brass south barrington have removed possibly years worth of fouling. If you would like a copy of the chat transcript please click "Send Transcript" below. The neat thing about the handle is that it keeps you from losing the gage in the really seriously worn barrels. Condition: New product. When I am asked to check the throat in Throat erosion gage guage rifle I first determine what kind of barrel I'm dealing with. Would you like to be alerted when the item becomes available again?

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What I'm saying is there are no Throat erosion gage guage rules but all the clues are usually there to make an educated assessment. The gases pushing the bullet through the barrel possess a greater velocity potential Moneytalks alisha blowjob the bullet does. Very trustworthy Suppose you have a bolt rifle with a 28 or 30 inch barrel you are quite proud of. Most of the time when people are concerned about a throat reading, it is relative to accuracy and accuracy itself is a relative term. Quite possibly no and in order to regain lost accuracy all one would have to do is re-crown the muzzle and "viola" Add to Cart Online Only. Utah must have gun shows,seeing is believeing. Suppose the gage reads a 3, or slightly more, but the shooter tells a Throat erosion gage guage story about how the rifle used to be a tack driver but has gradually lost accuracy. The following information is presented with the M14 rifle barrel in mind as that is my strong suit, but is generally applicable to other barrels.

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We're sorry, midwayusa. Learn how you can enable Javascript. Eligible for. Accuracy can be greatly affected by throat erosion. Quickly and easily check the wear of your service rifle throat with this simple tool. The gauge simply slides into the chamber and a reading is taken at the rear of the barrel.

New barrels should register at zero, while barrels too worn for service use will register past the last mark. The gauge is used to see the relative change in a chamber's throat by measuring the throat when the rifle is new or when gauge is first used, then comparing later readings with the first reading taken, noting how many rounds have been fired from one reading to the next.

The Gauge Spacer is used with the M1-type gauge. The spacer inserts over the M-1 gauge for the corresponding other rifle listed in the description.

The diameter gauge is used alone in any 22 caliber centerfire rifle where access to the breech is possible. The end of the gauge or the spacer that is inserted into the chamber has a series of lines on it.

By noting how far the gauge can be inserted, one of the lines can be used as an index, or starting, line. Subsequent uses of the gauge and the corresponding line that can be seen when the gauge is inserted will give a difference in dimension between the two lines. If this difference is then measured with a dial caliper or other measuring device , the result is the amount of throat erosion that has occurred. Only 1 in stock - order soon!

One Time Offers have limited quantities available and usually once they are sold out, they are not offered again. Ships today from MidwayUSA. Material: Steel. Quantity: Quantity Limit of 0 Due to high demand and our desire to serve as many Customers as possible, we are currently limiting the quantity that each individual Customer may order.

Notify Me. Add to Wish List close wishlist. Notes: The gauge is used to see the relative change in a chamber's throat by measuring the throat when the rifle is new or when gauge is first used, then comparing later readings with the first reading taken, noting how many rounds have been fired from one reading to the next. The M1, M1A gauge will work with many short action. Was this information helpful? Yes No Do you accept our terms and conditions?

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Suppose you put the gage in a worn barrel. Live Chat is available am to Midnight U. Create an Account Login Create an Account. As I mentioned earlier, the throat gage reading is only one piece of information. By the way, here's how I check for muzzle wear.

Throat erosion gage guage

Throat erosion gage guage

Throat erosion gage guage

Throat erosion gage guage. Product Overview

Far too many people came to the conclusion from the above information that a barrel was "worn out" when it even got close to a TE reading of 6. Frankly, little to nothing. We never used the gage when we were doing Inspections prior to Marines going on the range to re0qualify and that was a hugely important event for both the Marines shooting and we Amorers. Actually, we used the M14 TE gage extensively more with NM rifles than we ever used or needed them with standard issue M14's.

The reason of course was we did not use chrome lined barrels in NM shooting. On the Big Team, we replaced barrel only when it was close to being shot or was proven it would no longer shoot. So even at this high level of demand for accuracy, the TE gage was second in nature to how well a rifle would shoot. We went solely off how well a rifle shot. Since these barrels were cleaned properly and were not subject to improper cleaning techniques, we really did not need MW gages. However, I very much believe in using a MW gage when considering a purchase of an 03, 03A3, Carbine or Garand - also an M14 as long as the bore is not chrome lined.

A good reading there is more important than a super low TE reading. BTW, an excellent reading is between 1 and under 2, an acceptable reading is under 3, a reading over that and I would expect the barrel would have to be replaced within no more than to 1, rounds to hold service grade accuracy.

Though there is no "4" reading on many of the MW gages, you can sort of fiigure it out from the other engraved lines. I would consider that barrel as an automatic "have to" rebarrel. Great post. Very well written. Interesting tidbit about the Garands going overseas and having to be shipped back for rebarreling.

Most people, including me, would probably never think about those precautionary decisions that were made and the logistics involved. Very enlightening. As I recall, the most common problem at the range with Garands was excessively worn operating rod springs, which caused the bolt to bind against the rear of the receiver. When this happened to me, I was able to use a range rifle but being unfamiliar with the leather M sling, lost points we were issued and snapped-in with web slings.

Originally Posted by willriskit. Thanks from budster. Powered by vBulletin 3. By noting how far the gauge can be inserted, one of the lines can be used as an index, or starting, line. Subsequent uses of the gauge and the corresponding line that can be seen when the gauge is inserted will give a difference in dimension between the two lines.

If this difference is then measured with a dial caliper or other measuring device , the result is the amount of throat erosion that has occurred. Only 1 in stock - order soon! One Time Offers have limited quantities available and usually once they are sold out, they are not offered again. Ships today from MidwayUSA. Material: Steel. Quantity: Quantity Limit of 0 Due to high demand and our desire to serve as many Customers as possible, we are currently limiting the quantity that each individual Customer may order.

Notify Me. Add to Wish List close wishlist. Notes: The gauge is used to see the relative change in a chamber's throat by measuring the throat when the rifle is new or when gauge is first used, then comparing later readings with the first reading taken, noting how many rounds have been fired from one reading to the next. The M1, M1A gauge will work with many short action. Was this information helpful?

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Fulton Armory FAQ: The Infamous Throat Erosion Gauge

The Infamous Throat Erosion Gage. Throat erosion is a term often used by shooters, but far too often not understood.

From talking to the people I quickly learned many, if not most, had no idea what a throat reading really means. Most people had one concept; If the reading was 5 or more they figured they needed a new barrel. Well let me tell you, that ain't necessarily so. The throat gage has traditionally been used primarily by the military as one method in determining serviceability of a particular firearm.

A throat gage reading of OTHER barrels does not always provide the same information due to design differences. The following information is presented with the M14 rifle barrel in mind as that is my strong suit, but is generally applicable to other barrels. The term throat synonymous with lede, lead, or bullet seat refers to an area where the lands of the rifling start at the breech end of the barrel - just in front of the "free bore" area.

The lands actually start from the same surface plane as the groves, but quickly taper to full height. A measurement from the surface of one land to the opposing land will provide the bore diameter. The drawing for the NM M14 barrel calls for a bore diameter of. In general discussion this dimension becomes. Although the actual starting point of the rifling is determined from an internal point in the chamber the throat can be accepted as being a specific distance from the breech end of the barrel.

The throat gage is comprised of a forward section that is precision ground to a specific taper to coincide with the numbered reference lines found farther back on the shank. There are 11 lines used as reference, the forward most is not numbered but is quoted as being zero. The next 9 lines are numbered accordingly. Although the last line is not numbered - the "field reject" line - it is accepted as The rear end of the gage has a simple handle coming off at an angle.

The neat thing about the handle is that it keeps you from losing the gage in the really seriously worn barrels. When inserting the gage into a new "government" barrel until the tapered part bears against the lands, the first reference line "zero" will be even with the rear end of the barrel or just slightly beyond.

The throat reading is quoted as being zero, or perhaps one half. This tells you the rifling starts where it is supposed to and the bore diameter at that point is the. Suppose you put the gage in a worn barrel. You may find the number 4 reference line comes even with the rear of the barrel.

This would tell you the bore diameter is. The "throat" is worn away by 4 thousandths of an inch. If the gage inserted all the way to the last line - field reject - this would tell you the throat is worn by ten thousandths of an inch. So where does this infamous number 5 get its notoriety as being the point at which you must re-barrel?

Well here's the story. It has been found through the years that the "average" - what ever that is - throat wears at the rate of about one thousandth per rounds fired.

It has also been noted that this so called average barrel with rounds through it, and reading a 5 on the gage, has lost its peak accuracy at that point. As many other factors enter the picture, this rule of thumb is often proven wrong.

I'll digress here a bit and tell you a story. My M1A was equipped with a Douglas barrel that had over rounds through it and was reading 5 on the gage after starting at zero when it was new. My two yard scores were 's, one with 3 X's and the other with 4 X's.

Yes, I knew the gun was losing accuracy, but I also knew if I did my part I'd have a good score, but with less X count. The throat gage reading is just one bit of evidence. The proof is in the group sizes the barrel is capable of producing.

Now let's consider this throat issue and its real effect on accuracy. As the throat wears a little, or it was too far forward when new, yes, you have more "bullet jump". Does that really effect accuracy when in small amounts?

What about in larger amounts? That's a debatable subject at best. Consider for a minute the M1 Garands the Navy converted to 7. Think about that bullet jump. Some of these rifles shot very well in spite of the rifling starting about a half inch forward from what conventional wisdom says it should.

Wow, a reading on the throat gage. Think about that one. Actually it doesn't work quite that way and the gage reading would only be around a 7 or 8. Now think about this for a bit. Suppose you have a bolt rifle with a 28 or 30 inch barrel you are quite proud of. You shoot thousands of rounds through it until the throat reading is comparable to field reject. The rifling farther down the barrel is still in pretty good shape.

So you whack a couple inches off the back end and re-chamber it getting the throat reading back comparable to zero. Will it become that tack driver again? Not likely. You would have been much better off whacking a couple inches off the muzzle end and re-crowning it.

You would have noticed great improvement in accuracy. This is because you would have gotten rid of the worn rifling at the muzzle and the exit diameter would be back real close to. Many shooters do not realize the wear that takes place at the muzzle and how important that end is to accuracy.

Here is a brief view of what happens. The gases pushing the bullet through the barrel possess a greater velocity potential than the bullet does. At the very instant the bullet breaks seal with the muzzle the gases blow past the bullet. This "blow by" effect at the time of exit tends to wash away metal at the muzzle. As the muzzle erodes, the gases start leaking around the bullet before it is really supposed to be free from the barrel. Any irregularity in the way the gases leak past the bullet will have effect on accuracy.

The condition of the rifling at the muzzle and the crown have far more meaning than a few thousandths of wear at the throat. With a throat reading of 5, you'll usually see about 2 or 3 thousandths of wear at the muzzle. This amount of wear at the muzzle will account for losses in accuracy. When I am asked to check the throat in a rifle I first determine what kind of barrel I'm dealing with. Assuming it is a government barrel, when I insert the throat gage I am thinking about the muzzle. Suppose the gage reads a 3, or slightly more, but the shooter tells a convincing story about how the rifle used to be a tack driver but has gradually lost accuracy.

I then check the muzzle for erosion. Once in a while I find the muzzle has worn at a greater rate than normal which would account for the complaint. This greater wear than normal could be caused by an inconsistency in heat treat, or even from cleaning rod abuse.

Whatever, if the muzzle is open too much, it isn't going to shoot well. By the way, here's how I check for muzzle wear. Originally I turned a piece of drill rod into the configuration of the front of an M14 flash suppressor and brazed a flash suppressor nut to one end of it.

Using the gage lab at Rock Island Arsenal I selected a barrel with a proper drawing dimension muzzle as my bench mark. Then I went through a process of modifying the length of my suppressor like tool until I could thread it onto a barrel, insert the throat gage and get a reading of zero at the end of it.

This worked fine for checking muzzles that didn't have a flash suppressor already in place. After this I went through a process of painting one side of the taper of a throat gage with layout ink, inserting it into the muzzle, and marking how far in the taper went. Then I would measure the diameter on the taper adjacent to my mark. As time went on and I gained experience I got to where I could insert the gage into the muzzle of an M1 and estimate the amount of wear very close.

I carefully insert the gage into the flash suppressor until I feel contact with the front of the barrel. Making mental note of the reading at the end of the suppressor, I then center the gage and slip it into the bore. By noting the amount of additional gage travel and subtracting one reference line I can determine very close the amount of muzzle wear. Now some comments on throat readings from non-government barrels. For the most part, little meaning can be extracted from a throat gage reading alone.

To start with, think about all the various folks out there making barrels. We know that a throat gage reading is in part determined by the bore diameter. What are the starting bore diameters for all these different barrel makers? Your guess is as good as mine. I can tell you that one particular variety put out by a fellow in Wisconsin is 2 to 3 thousandths less than. These barrels can have many rounds through them before they ever read zero, giving the false impression of a new barrel.

Then consider a barrel blank of some other manufacture that has a bore diameter of around. Suppose the reamer used to form the chamber cuts the throat a little forward of where it is supposed to be. This brand new barrel, and a tack driver at that, may throat at a2 or 3.

Throat erosion gage guage

Throat erosion gage guage