What exactly is Mag-na-port?Most shooters, when asked to define what recoil is, would probably describe the physical and psychological beating received when firing a firearm. The shooter may not be aware of the problem of flinching as a result of uncontrolled recoil and theeffect that this will have on the target. yes Some shooters are simply not able to overcome flinching easily.
Recoil is the reaction that takes place as the projectile leaves the barrel and releases gas, resulting in a tremendous amount of energy.The higher the velocity, the greater the reaction. Recoil will cause the muzzle to jump or rise and the gun to pivot in the shooters hands.
The Mag-na-port process was developed in the USA by Mr. Larry Kelly who used simple physics combined with his 30 years experience in E.D.M (Electrical Discharge Machining) technology and lifetime knowledge of firearms to develop a method of reducing recoil and muzzle jump. Using trapezoid shaped ports to aim exhaust up from the top of a gun barrel, the muzzle pressure is reduced.
The E.D.M. process used by Mag-na-port can be described as a spark erosion process electrical spark wears away the metal using an interrupted flow of electrical power. When finished, a clean burr-free port is cut into the barrel, leaving the surrounding finish undisturbed.The trapezoid design works as a metered port regulating gases as they escape, ensuring the velocity effects by Mag-na-porting are insignificant.
The trapezoid ports are so unique in shape and function, they were the first porting system protected by U.S. Patent and are currently protected as a registered trademark of Mag-na-port International Inc.
In 1989 Graham Bugden purchased the only Australian Mag-na-port agency for M.A.B. Engineering.
Mag-na-port has been tested many times since its initial introduction. H.P. White Laboratories performed tests on rifles equipped with and without Mag-na-port to determine the effect on free recoil and velocity. Findings in the laboratory-conducted test had a 20.8% reduction in free recoil for the rifle equipped with Mag-na-port. These same tests noted velocity averages less than four-tenths of 1 percent with the Mag-na-ported rifle, considered statistically insignificant.
In tests at Cornell University using a series of compression sensors rigged to a modified Ransom Rest mounted on a spring-loaded sliding track connected to an oscilloscope, a before and after analysis of the effect of Mag-na-porting on a series of different calibre revolvers was conducted. These tests were on revolvers ranging from .38 Special to .44 Magnum, in barrel lengths from 2 to 8-3/8 inches and frame sizes from small to heavy. Recoil reduction ran from a low of 11% on the .38 to a high of 47% on the 44 magnum. The conclusions drawn from the tests confirmed that Mag-na-port does not decrease bullet velocity or increase muzzle blast. These same tests also confirmed that Mag-na-port does reduce the intensity of apparent recoil.
The velocity impact from porting is affected by port placement with regard to muzzle and chamber. The trapezoid ports placed near the end of the barrel allow maximum bore travel for the bullet to receive full pressure prior to reaching the ports and exiting the barrel. Mag-na-port in and of itself has no effect on the accuracy and does not alter the internal bore configuration or in any way distorts the bore.
Mag-na-porting is done at the M.A.B. Engineering factory in Brisbane, usually with a maximum 10 day turn-around time.
Proport Recoil Reduction for Shotguns
The Pro-port process was introduced in the 1970ís and has been tested extensively to determine the most effective shape and pattern for shotgun porting.
There are two stages of perceived recoil when a shotgun is fired:the first is the result of primary ignition and the second the consequence of expanded propellant burn-off at the muzzle.The ports dissipate shock and because of their design and placement, redirect muzzle energy to dramatically reduce muzzle lift.For the shooter, this translates into a reduction of perceived recoil of 15 to 20% and 40 to 60% less muzzle jump.
Standard Pro-porting consists of eleven compound ellipsoid ports cut into each side of a barrel.These ports are placed behind the choke tube or constricted area in a series of two rows with six on the top and five on the bottom.This style of porting is used by shotgun shooters looking for both recoil and muzzle lift reduction.Other configurations are available.