Briley Browning Invector DS Spectrum Choke 12 Gauge Improved Cylinder. These Choke Tubes by Briley have a minimum gap geometry and high resolution RMS interior finishes which provide less pellet deformation with consistently tighter patterns. The Briley Browning Invector DS Spectrum 12 Gauge Choke Tube has a color-coded band to help you quickly find the right choke for the job. These chokes are crafted from aircraft-grade 17-4 stainless steel to deliver maximum durability with every shot. For easy installation there is no need to remove the choke from your gun - it is laser marked on the outside. You won't have to guess at the choke size because the Briley Browning Invector DS Spectrum Helical Choke Tube is a perfect choice for any shooter. Specifications for Briley Browning Invector DS Spectrum Choke Tube: Manufacturer: Briley Fabric/Material: 17-4 Stainless Steel Gauge: 12 Gun Make: Browning Condition: New Features of Briley Browning Invector DS Spectrum Choke Tube Helical Porting Long parallel section ideal for lead or steel Package Contents: Briley Browning Invector DS Spectrum Choke Tube Briley IDSS12IC: Browning Invector DS Spectrum Choke 12 Gauge Improved Cylinder