Sep 21, 2017 a velocity comparison of the aac threaded traditional cut rifling g19 bbl and the glock factory oem polygonal g19 threaded bbl. Virtually every quality barrel maker produces a fantastic product nowadays. As a matter of fact, the bullets are pressure formed following a circumference and not cut like in traditional rifling pic. In firearms, rifling refers to the helical groovings that are machined into the internal bore. Italian arms maker sabatti introduced what they claimed was a new type of rifling last year called multi radial rifling mrr. I dont know how to break it to you, but your henry does not have octagonal rifling. He suggests that there are two other factors involved, a lead fouling in the leade which is the part of the barrel chamber just before the start of the rifling and b bullet setback.
No problems have ever been noted with these, why should a handgun with the same form of rifling. The purpose of rifling is to impart a spin to a projectile as it is thrust. Multi radial rifling mrr is a special rifling type, which unlike conventional rifling doesnt have sharp edges. Welcome to the predator masters forums welcome to predator. Discover over 362 of our best selection of rifling button on with topselling rifling button brands. Although it is not the polygonal rifling most notably seen in glock pistols, it is still very similar in. Polygonal rifiling vs traditional rifiling youtube. I finished the 10 clean shoot and clean etc and shot a 3 shot group which was a hole. The vast majority of custom rifle makers do not manufacture their own barrels. Barrel rifling results in fps bbti ballistics by the inch. Hammer forging machines can produce barrels quickly and cheaply, but the machines themselves cost millions of dollars. Firearms today typically use one of two different styles of rifling to impart spin to a bullet and thereby stabilize it for flight.
Behaviour do not make inappropriate or offensive posts including threats, harassment, swearing, prejudice, defamation, deliberate insults or namecalling, other negative remarks about this forum, its moderators and administrators or your fellow members. The glock marksman barrel with modified polygonal rifling used in postgen4 pistols is clearly what was once being called the glock marking barrel. Is rifling twist direction righthanded for a reason. Recently a special type of uncornered polygonal rifling with rounded valleys, dubbed multi radial rifling, has also been introduced by the. Polygonal rifling does not cost any more to make than conventional rifling if the same rifling method is used. Another form of rifling that has a significant following is polygonal. It is so rounded that you can barely notice the rifling. I have rifles with all types of rifling, and many with 5r rifling, and there is a noticeable difference in shotstrings between cleanings, and also how quickly and easily it cleans up compared to standard rifling. Go to conventional rifling and we do mostly 4 groove for the 6ppc benchrest shooters but ive got a conventional 5 groove on my gun and that will agg.
Hammer forging produces a type of rifling called polygonal rifling. This type has a smaller bore area than the male type of polygonal rifling designed and used by lothar walther. Rifling is often described by its twist rate, which indicates the distance the bullet must travel to complete one full revolution, such as 1. Polygonal rifling can be found in a lot of service or law enforcement pistols because of the benefits it provides.
Ive never been able to get a complete assurance of whether lws polygonal is. Here you can see the difference between classic enfield rifling compared to the 5 land and 3 land polygonal rifling. Until the advent of the hollowbase minie ball, which obturates upon firing to seal the bore and engage the rifling, the patch provided the best means of getting the projectile to engage the. Rifling did induce a spin on these projectiles, though it did so via the patch used as a bore sealer. Because there is a distinct edge at the transition from a land to a groove impression, the widths of the lands and grooves can be measured in this traditional rifling method. Polygonal rifling a further development of lancaster ovalbore rifling where, instead of an ovalshaped bore crosssection that spirals as it proceeds down the barrel, that crosssectional shape is a soft hexagon, octagon or other multi lobed shape. Mainly it is the quality of the barrel that makes a difference in accuracy. Nov 30, 2015 according to patrick sweeneys book, the gun digest book of the glock, its his opinion that.
Has it been found that its more accurate or less accurate than a traditional button rifled barrel of equal quality. Track is a proprietary rifling known as single edge polygonal sep available through triarc systems. The main goal of sabatti was to develop a rifling system with all the positives of the traditional type and none of the negatives. Jun 08, 2010 the advantages of barrels with polygonal rifling include a smaller gap between bullet and bore, leading to slightly higher bullet velocities, and smoother bores that accumulate less fouling. My cw40 with conventional rifling always generated more velocity than my k40 with polygonal rifling. For one, the bores create a tighter gas seal leading to higher muzzle velocities, but less lead depositscleaning and extended barrel life are also considerations. Wow was i excited and am very pleased with this shilen. There is still one reference to it on their home page. Another form of rifling that has a significant following is polygonal rifling.
In over 50 years of shooting i have owned many fine rifles,some cut rifling and some buttoned and when the. To see several rifling pattern illustrations go to registered users only. Those poly barrels can have three and up hills and valleys to make up the rifling. Questions on the gen 5 marksman barrels the leading. Its suppose to relieve or reduce pressure against the bullet jacket. How do you convert a multipatch in to a set of polygons representing floors, walls and ceilings. If you were to take a crosssection of an hk p7 barrel it would look the the one on the right below. Multiradial rifling mrr is a special rifling type, which unlike conventional rifling doesnt have sharp edges. Keep in mind that poly means whatever the barrel maker wanted it to mean and the dimensions where his to craft. Polygonal rifling has many advantages over conventional rifling in terms of bore friction, gas sealing, and minimizing bullets distortion. Is there evidence to support that a polygonal barrel wear slower than a button rifled barrel. It is simply too costly to perform this function inhouse due to the cost of the equipment necessary and the relatively few barrels that the maker will require. But, is it truly a polygonal rifling as the austrian manufacturer and most hardcore fans claims.
Instead of cutting or broaching rifling grooves with vertical walls and sharp, 90degree angles, sabatti hammers its barrels around a mandrel featuring gently rounded grooveland edges. The name came from the one definite effect of the modified rifling, which makes it far easier to associate fired bullets to a specific barrel. If you go to the glock website you will see that they use both polygonal as well as octagonal broached bbls dependent on the caliber. And like everything in the firearms industry, there is great debate between which is better. Depending on the bullets some might work better than others as the polygonal is not always the same precise design just like traditional rifling is not the same. The theory behind polygonal rifling, as i understand it, is that since the angle between the side and bottom of the groove is 90 degrees it is easier for the bullet to obturate seal the bore completely. Polygonal rifling is a type of gun barrel rifling where the traditional sharpedged lands and grooves are replaced by lessedged hills and valleys in a polygonal pattern, usually taking the form of a hexagon or octagon. More recently, polygonal rifling, a throwback to the earliest types of rifling, has. The objective was to develop a rifling system with all the positives of the traditional type and none of the negatives. The purpose of rifling is to impart a spin to a projectile as it is thrust through the air in order to stabilize it and allow it to be more accurate.
Feel free to buy anything you want, they all shoot well. A few differences between the springfield xd subcompact. Polygonal vs traditional rifling velocity test youtube. You start to kill a few adds and since its a 200 rpm you will most likely need 2 shots for most targets which is cool with subsistence as you gain x amount i think its like 23 shots back from reserves but as soon as you proc mkcx2 or x3 you will most likely only need one shot for most redbars and. The type of lead and the type of lube and quanity of the lube used on a lead bullet has more to do with leading than the type of rifling. Recently a special type of uncornered polygonal rifling with rounded valleys, dubbed multiradial rifling. With 155 grain jhp, and 165 grain fmjs, the cw40 always had 10 20 more feetsecond. In essence, it is a combination of standard and polygonal rifling. The lead or patch deformed enough to follow the rifling. Italian arms maker sabatti introduced what they claimed was a new type of rifling last year called multiradial rifling mrr. More recently, polygonal rifling, a throwback to the earliest types of rifling, has become popular, especially in handguns.
This rifling is described as being made of two different alternating radiuses. Polygonal rifling is a type of rifling wherein the traditional lands and grooves are replaced by hills and valleys in a rounded polygonal pattern, usually a hexagon or octagon. In rifled barrels, the patch also provided a means to transfer the spin from the rifling. The grooves most commonly used in modern rifling have fairly sharp edges. So some rifling patterns might make great rifling but lousy leade and throat.
Years ago, i tried a couple of different polygonal rifled barrels and results were less than stellar. It takes multiple passes while rotating the barrel. Polycoated bullets and polygonal rifling will these run in. Polygonal barrels tend to have longer service lives because the reduction of the sharp edges of the land the grooves are the spaces that are cut out, and the resulting ridges are called lands reduces erosion of the barrel. Very accurate, indeed, and more than adequate for serious social work. Subsistence and mkc dont really work well together. The patch provided some degree of sealing, kept the ball seated on the charge of black powder, and kept the ball concentric to the bore. This spin serves to gyroscopically stabilize the projectile, improving its aerodynamic stability and accuracy.
Although it is not the polygonal rifling most notably seen in glock pistols, it is still very similar in appearance and performance. Supporters of polygonal rifling also claim higher velocities and greater accuracy. The exterior is octagonal on all henrys, but this has absolutely no effect on how the bore performs. The pacnornoveske polygonal rifling is essentially 7r as its the same kind of design of angle sided lands, but with 7 lands instead of 5. Polygonal rifling was the norm in the early period of gun making, notably by the brits and others in europe. Night watch lightweight frame fluted barrelpolygonal. Firearms identification, a broad term used in forensic science to describe the study of what is usually incorrectly referred to as ballistics, includes the study of the tool marks left on a bullet from the lands and grooves as it passes down the barrel. That said, aftermarket barrels exist everywhere for a glock pistol and you can find a drop in replacement with ease.
The rifling is conventional, and is very similar to what is currently referred to as ballard. The advantages of barrels with polygonal rifling include a smaller gap between bullet and bore, leading to slightly higher bullet velocities, and smoother bores that accumulate less fouling. Some of the rifling system like the pope did not involve swaging a bullet into the rifling from a ctg through a leadethroat, the bullets were being muzzle loaded using a false muzzle. Barrels with polygon rifling can shoot just as well as those with conventional rifling but no better. The hole in the barrel is not round, and the shape rotates down the length of the barrel. Poly rifling, meaning many sides, has been around longer than most of us. Jan 26, 2012 hammer forging machines can produce barrels quickly and cheaply, but the machines themselves cost millions of dollars. Cad and multipatch conversion geonet, the esri community gis. The primary function of this innovation is to provide an improved rifling for a gun barrel, which has a single edge area and a polygonal area separating the grooves. Glock advises against using lead bullets in their polygonally rifled barrels, which has led to a widespread belief that polygonal rifling is not compatible with lead bullets. It seems one of the primary reasons for poly rifling is bore life. Other companies such as noveske pac nor and lwrc use a rifling more like the conventional rifling, with both of each lands sides being sloped but having a flat top and defined corners. Polygonal rifling destiny 2 legendary barrel light.
Why is rifling twist direction usually righthanded. We should never take gun technology for granted, even when the matter may appear trivial. Usually, the polygonal barrels are a bit more expensive than traditional rifling. A multipatch feature is a gis object that stores a collection of patches to represent the boundary of a 3d object as a single row in a. Have you ever noticed that most american gun makers make the rifling go in a righthandedor clockwisetwist direction, whereas many british gun makers historically choose lefthanded twists. Obviously enough to offset the supposed lower friction of the polygonal rifling.
Polygonal barrels tend to have longer service lives because the reduction of the sharp edges of the land the grooves are the spaces that are cut out, and the resulting ridges are called lands. However, i cannot say it makes any rifle more accurate than traditional. Use the factory barrel for copper jacketed or copper plated ammo and swap barrels when you want to shoot cast boolits. Multiradial rifling true innovators or spin doctors. Discussion in main message board started by judd, aug. I am told black hole weaponry does not offer the 5 land poly rifling. Glock, kahr, and hk use polygonal rifling instead of the traditional lands and grooves rifling. I shoot some cast and powder coated lead bullets through the factory glock and the lone wolfalpha wolf barrel. Shilen has a unique rifling style, what they call ratchet rifling. Lee 401175 cast pc bullet in polygonal and traditional rifling just messing around with my glock 23 and a new lone wolf barrel. Best value rifling button great deals on rifling button. Commons is a freely licensed media file repository. The heart of this firearm is a 24inch, coldhammerforged barrel with multi radial rifling mrr.
Variations in twist rate up or down over about 34 have been proven detrimental to accuracy in benchrest barrels. Although the picture just shows the enfield and the 3 land profiles. The drawings that mikecr posted are true renditions of polygonal rifling. Information from its description page there is shown below. In rifled barrels, the patch also provided a means to transfer the spin from the rifling to the bullet, as the patch is engraved rather than the ball. Feature templates for multipatch layers include construction tools for creating multipatch polygons, rectangles, and circles. I can also tell you from experience that seeing the difference is as easy as doing a sideby side comparison of several companiesa. Multipatcheshelp documentation arcgis desktop arcgis online. Broach rifling is a modern, productionoriented variant of cut rifling that addresses some shortcomings of the cut rifling process. Barrel making has come an extremely long fact i challenge anyone to figure out why they are called barrels. It looks basically like polygonal rifling with more rounded corners.
Several companies in the us and in europe use polygonal rifling. Learn about the three kinds of barrel rifling in this article about custom rifle barrels. Rifling is the process of making helical grooves in the barrel of a gun or firearm, which imparts a spin to a projectile around its long axis. A curved rifling b pinched rifling c button rifling d straight rifling e polygonal rifling. Glock features polygonal barrel rifling on all of its handguns. It looks like a version of polygonal rifling to me. Yes, i have fired some handguns with polyagonal rifling. In polygonalrifled barrels, the barrel and hence the bore is cold hammer forged or otherwise twisted creating swells or mounds, also giving. If the handgun fires fixed cartridge ammunition and was manufactured in 1899 or later, united states law requires that the barrel be rifled in order to qualify as a pistol or revolver rather than a short barreled shotgun subject to registration an. In rifled barrels, the patch also provided a means to transfer the spin from the rifling to the bullet, as the patch. Today it is seen on the 20 mm m61 vulcan gatling gun in several. Sabatti multi radial rifling, which they boast is the greatest innovation in rifling in 100 years.
For shooters, polygonal rifling has distinct advantages over its swaged brothers. I am ready to start playing after 3 more 3shot groups. Polygon rifling does not lead more than any other type of rifling. Get the latest product info, update, special offers and much more. Polygonal has some benefits and some tradeoffs depending on the caliber and what you are trying to do. Create multipatch featuresarcgis pro documentation.
Polygonal refers to a rifling style, its button rifled too. The original polygonal rifled barrels, the whitworth, were developed specifically for and during the time when lead bullets were the only game in town, or anywhere else for that matter. I call sabattis boast on that a pile of horse excrement. While cut rifling uses a singlebladed cutter, a broach is a metal bar with sets of progressive cutting blades in its outer surface corresponding to the number of grooves. At sabatti we believe we have reached the objective we had while designing the new system and, by doing so, we have exceeded our expectations. Aug 05, 2012 polygonal andconventional rifling in the article i will explain the what is polygonal rifling anf differences bet. In a polygonal rifled barrel, the rifling may not bite as much and if the bullet twists less than the rifling, the rifling acts like an oblique scraping tool on the bullet rather than a parallel track, and that scrapedoff lead gets left behind in the barrel and a wave of hot propellant gasses pass over it as well as subsequent bullets and.
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