David Tubbs recommendations for the TMS polishing system not the fire lapping system.
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What this told me and what I further confirmed in my testing was that no matter what kind of a barrel you
are using or how smooth or polished the bore is, the throat area is going to have annular tool marks from when
it was chambered. The chamber itself may also have these tool marks, but it is relatively easy to polish the
chamber, but not the throat. In fact, any polishing of the bore (throat and rifling) should be in the direction
that the bullet travels. In addition, all rifle barrels have tool marks left down the entire length of the barrel
from their manufacturing process — these also are annular in design, which mean that as the bullet passes
down the barrel it encounters each of the marks, much as you encounter speed bumps on a road. With the
removal or smoothing of these bumps, the barrel shows obvious improvement in accuracy. Further, the overall
mirror polishing effect of FinalFinish™ greatly reduced the amount of fouling, making cleaning much easier,
and there also was an added bonus of a velocity increase with an increased powder charge with no increase in
After researching existing information on this subject, I then conducted my own tests on over 20 different
firearms which included new factory barrels, used barrels with several hundred to several thousand rounds
through them, to brand new match barrels which had previously been hand lapped. These test barrels represented
a wide spectrum of calibers: .22lr, pistol calibers, and rifle calibers.
Using a barrel holding fixture and trackable bore scope with a video camera and recorder, I was able to
document the initial condition of the throat and rifling in each of the barrels before starting the FinalFinish™
process, and also further document what each specific number of rounds with a specific size abrasive did to
the overall interior finish of each barrel.
In most all cases after using the initial 50 shot FinalFinish™ series there were still a few of the deeper tool
marks left, though to a greatly reduced degree (some can never be removed). All of the test barrels exhibited a
more uniform bore diameter after the FinalFinish™ series, and in all cases less than .0003” (three ten thousands
of an inch) of metal was removed. All test barrels showed greatly reduced fouling and easier cleaning.
[One interesting note: when using the bore scope on the exterior of the new factory firearm’s barrel, it was
smoother than the finish on the inside of the barrel (bore)! This is, of course, before the use of FinalFinish™
(tells you something about marketing a product...).]
In accuracy testing with 6 of the rifles (a total of 4 different calibers) of which all had the same handloads
shot through them before and after the FinalFinish™ series, 5 of the 6 showed accuracy increases of up to
62%. The barrel which showed no improvement in accuracy was an excellent shooting barrel to begin with
but it did show greatly extended accuracy (number of rounds before accuracy began to fall off due to fouling
buildup). In all three of the large caliber revolvers I tested (with factory ammo), all shot groups half the size of
their original group.
You should! FinalFinish™ can be of special benefit to “gas guns.” By the way they’re constructed, tight
spots in the bore are commonplace. These tight spots can be created by the assembly process when the gas system
parts and muzzle brakes
are installed. Plus, many, many gas operated rifles will have a burr that resulted
from drilling the gas port. FinalFinish™ will uniform the tight spots to uniform bore diameter and easily
remove any such burrs. Plus, since a gas-operated rifle can’t have its barrel set back and rechambered to overwrite
throat erosion, continued use of the FinalFinish™ system will help sustain accuracy over a longer barrel
life. Also, there is absolutely no danger in using FinalFinish™ in a chrome lined barrel. It will uniform and
polish just like any other (there is less than 0.0003 inches of metal removed).
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.0003 aint gonna make a bit of difference.