bore profile

After that, he developed tools to produce the choke bore profile correctly and smoothly.

Another characteristic of this instrument was the bore profile, which remained conical even between the valve sections.

The barrel has the same bore profile as the PSG1, including polygonal rifling, and lacks a muzzle device.

Features include an extended threaded o-ring barrel with polygonal bore profile and taller sights enabling use of sound suppressors.

With the exception of the short-barreled model, FABARM shotguns are sold with their Tribore barrel which is a deep-drilled, machined barrel with three separate internal bore profiles.

While the degree of conicity of the bore does affect the timbre of the instrument much as in a cornet and trumpet, or a euphonium and a trombone, the bore profile of a sousaphone and most tubas is similar.

Beginning at the chamber and forcing cone, the bore is enlarged to .7401" to soften recoil while the second profile is in the middle of the barrel gradually choking down to .7244" to emulate a cylinder bore profile to increase velocity.