Briley Browning Invector Plus Spectrum Ported Choke 12 Gauge Improved Modified .025. The vented choke tube body speeds gases throuh the use of choke collars resulting in fast recovery and dense wad coverage. Enhancing patterning and covering more ground with less wind drift is one of Briley's goals. Briley tries to make choke tubes that will not only produce a pattern but one that is also fast and efficient. Briley Invector plus (Ipp) choke tubes accomplish this by utilizing a patent pending "salt bath etch" process. The etch is performed inside the choke tube and therefore the pattern is more precise than any other method. Further the etched portion of the choke tube provides the shooter with an understanding of the windage and elevation of the shot resulting in more precise triggering. The design also reduces any cone or angle the choke tube can produce resulting in less pellet deformation. This coupled with the fact that the Ipp choke is a tube that has been cold sprayed with a spectrum coating results in a high muzzle velocity that is high enough to pin the shot down and completely eradicate any fading or mire giving the shooter a consistently high muzzle velocity. Further the etching or markings from the Briley Invector plus makes it impossible for the shooter to "look" at the choke tube and guess what he is going to fire. For the shooter who wants to get the most out of their shot try the Briley Browning Invector+ Choke Tube. Specifications for Briley Browning Invector Plus Spectrum Ported Choke Tube: Manufacturer: Briley Gauge: 12 Choke Tube System: Browning Invector Plus (+) Gun Make: Browning Package Contents: Briley Browning Invector Plus Spectrum Ported Choke Tube Briley INPSP12IM: Browning Invector Plus Spectrum Ported Choke 12 Gauge Improved Modified .025