With the advent of many more Tactical rifles on the market the problem with some of these weapons of Phosphate particles in the bore has appeared.This is occurring in both very expensive, quality firearms as well as the less expensive ones.
What happens is that when the barrel or weapon manufacturer applies the Phosphate coating (that "rough" grey or black military finish) to the exterior, the muzzle and/or chamber end is not being completely sealed, allowing some of the Phosphate particles to enter the bore and adhere to the chrome lining or barrel steel. The result when any Subsonic ammunition is fired is predictable since the Phosphate particles act as a very effective brake, radically slowing and sometimes stopping the projectile in the bore; an inconvenient and potentially dangerous situation.
The Good News™ is that the particles are mechanically rather than chemically adhered to the barrel, although it is a fairly strong bond and just shooting high velocity ammunition through it will not remove the Phosphate. The Solution: Remove the Phosphate particles. Fortunately, this only has to be done once and then the tube - given that it has the correct chamber dimensions, etc. – will be suitable for use with subsonic ammunition from then on. This can be done via the use of EBR Phosphate Removal System, available through EBR, Inc. on our website
At last EBR is able to provide clients with a solution to the problem of phosphate "overspray" in the bores of Tactical weapons.
We have noticed in the recent past an upturn of the "stuck in bore" syndrome from clients utilizing subsonic ammunition. Whilst the first reaction is often "the ammo didn't have any powder in it", this unlikely since EBR uses CAMDEX computerized, automated loading machines which stop immediately whenever a round has too much or too little propellant in it. So while anything is possible this is not very likely.
So we dug deeper and found that with the great increase in the number of "Tactical" weapons in use, there was a corresponding increase in the use of phosphate firearm finishes. This is the dark grey or black gritty-feeling finish found on most M16/M4 type weapons. And now almost every gun company produces some version or another of a Tactical firearm, most all of which have the phosphate finish.
Unfortunately, not all manufacturers are being careful about sealing the bore and chamber of the barrel when applying this finish, resulting in phosphate particles in the bore of the weapon. Some examples we've seen were so bad they were coated from chamber to muzzle and produced appalling accuracy even with high velocity ammo. They can be plainly seen with a good-quality borescope.
This condition only affects high velocity ammunition slightly (being detrimental to accuracy), but it affects subsonic ammunition dramatically. Think of the subsonic bullet hitting a grappling hook with a parachute attached on the way down the bore. Just shooting high velocity ammunition does not remove these tenacious little critters, but our phosphate remover does.
And the Good News™ is that it only has to be done one time on a barrel to make it compatible with all subsonic ammunition from then on…provided of course it was a decent barrel to begin with. We only have one M4 barrel in our vault (new) from a major manufacturer that simply will never shoot subsonic ammunition and doesn't do so great with high velocity either…that is because of the very deep tool marks made when the rifling was cut; it will just never be a good barrel, period.
Just follow the included instructions CAREFULLY, and improve the performance of your Tactical weapon. Just $18 delivered to your door with enough to treat ~3 guns or one REALLY bad one.