The new Browning Invector-DS choke tube system is the biggest leap forward in design since interchangeable choke tubes were introduced. With the Invector-DS, weve taken the proven thin wall, muzzle thread choke concept to the next level of shot pattern performance. The exclusive brass alloy band at the base of the tube seals out gas and grit that sneaks between the barrel and tube, making the Invector-DS tubes easy to remove even after extensive shooting. Thin wall construction reduces the flare at the end of the barrel for a sleeker shotgun appearance. Lastly, the Invector-DS offers the most consistent, reliable tightening of any system ever. With all these features, you cant lose with Invector-DS.
Important: Browning Invector-DS choke tube designations
are not based on the inside diameter as measured by a micrometer
but by the actual pattern that is created by each choke.
In general practice patterns are determined shooting at a 30" circle at 40 yards. Our goal in scaling the tubes is a consistent percentage of the pattern from full choke to cylinder choke. For example a common specification for FULL CHOKE is for 65-75% of the total pellets to be in the 30" circle at 40 yards. IMPROVED MODIFIED would put 55-65% of the pellets in the circle at 40 years. MODIFIED would be about 45-55% and so forth.
To fit the Browning B725 and A5.