Overview Keeps going and going. This is a choke tube that is long on length and even longer on performance. Each tube extends beyond the end of the barrel for easy removal and for the most even, tight patterns in Browning's history of choke tube design. Proprietary differential banded gas seal eliminates residue build up and makes chokes easy to remove and install Integrated spring suspension holds the seal tight, yet allows expansion against the barrel wall for a perfect fit and a smooth transition for shot column entering choke Gas is controlled at the interface between choke and where it seats in the bore From skeet to full choke, patterns tighten consistently and reliably Invector-DS tubes fit only Browning shotguns designed for Invector-DS and are not for use in shotguns showing Invector-Plus or Standard Invector on the barrel(s). Click here to learn more about Browning choke tubes. Specifications Type INVECTOR DS CHOKE,12,LMOD,EXT INVECTOR DS CHOKE,12,LFULL EXT INVECTOR DS CHOKE,12,FULL,EXT INVECTOR DS CHOKE,12,IMOD,EXT INVECTOR DS CHOKE,12,MOD,EXT INVECTOR DS CHOKE,12,IC,EXT INVECTOR DS CHOKE,12,SK,EXT Item Number 1134233 UPC 023614373544 Material Nickel Chrome Moly Color Stainless Steel Pockets Chrome Choke Gauge 12 Choke Pattern Percentage 45%-55% Weight 4.8 oz MSRP $72.99 Item Number 1134243 UPC 023614375401 Material Nickel Chrome Moly Color Stainless Steel Pockets Chrome Choke Gauge 12 Choke Pattern Percentage 70%-75% Weight 4.8 oz MSRP $72.99 Item Number 1134253 UPC 023614373513 Material Nickel Chrome Moly Color Stainless Steel Pockets Chrome Choke Gauge 12 Choke Pattern Percentage 75%-80% Choke Notches I Weight 3.2 oz MSRP $72.99 Item Number 1134263 UPC 023614373520 Material Nickel Chrome Moly Color Stainless Steel Pockets Chrome Choke Gauge 12 Choke Pattern Percentage 65%-75% Choke Notches II Weight 3.2 oz MSRP $72.99 Item Number 1134273 UPC 023614373537 Material Nickel Chrome Moly Color Stainless Steel Carrier Attachment 12 Carrier Style M Pockets Chrome Choke Gauge 12 Choke Pattern Percentage 55%-65% Choke Notches III Weight 3.2 oz MSRP $72.99 Item Number 1134283 UPC 023614373551 Material Nickel Chrome Moly Color Stainless Steel Pockets Chrome Choke Gauge 12 Choke Pattern Percentage 40%-45% Choke Notches IIII Weight 3.2 oz MSRP $72.99 Item Number 1134293 UPC 023614373568 Material Nickel Chrome Moly Color Stainless Steel Pockets Chrome Choke Gauge 12 Choke Pattern Percentage 35%-40% Choke Notches IIIII Weight 3.2 oz MSRP $72.99 Recommended 12 Gauge T-Wrench – Fits all Browning Choke Systems $25.99 Citori 725 Sporting $3,419.99 Moldable Ear Plugs $41.99 Dry Fire Gore-Tex Paclite® Jacket $157.99 Dutton Shooting Vest $104.99