This tube fits the following guns:
Browning 12ga A5 (Old Style)
Charles Daly (Made in Italy) 12ga (Current Production O/U)
CVA 12ga 
FN-SLP 12ga 
H and R 12ga 1871 Pardner Pump
H and R 12ga 1871/N.E.F.
H and R 12ga BS 130 Trap
Ithaca 12ga Model 37 (Current Production)
Maverick 12ga Model 88
Miroku 12ga
New England Firearms 12ga (Factory choke 1.5" long)
Pedersoli 12ga 
Ruger 12ga (Produced before 1992, Factory flush mount 1.5
Savage 12ga (Except 512, 411, and Milano)
SKB 12ga Standard (Factory flush mount 1.5" long)
Smith and Wesson 12ga 1000 (old style)
Stevens 12ga 350, 67-E, and 320
Stoeger 12ga Coach
Stoeger 12ga Condor O/U
Stoeger 12ga Longfowler O/U and SxS
Stoeger 12ga Single Barrel
Stoeger 12ga STF3000
Stoeger 12ga Uplander SxS
Stoeger 20ga Longfowler O/U and SxS
Thompson Center 12ga Encore
Weatherby 12ga Element
Weatherby 12ga Orion
Weatherby 12ga SA 459 Turkey Xtra Green
Weatherby 12ga SA and PA 08 (Threads at Bottom of Factory Choke)
Winchester 12ga 1200, 1300, 1400, 1500 and Ranger
Winchester 12ga Super X2 Practical Mark I and II
 
12ga Browning Invector/Win Anaconda Striker 0.670
 
Patternmaster Anaconda “STRIKER” (0.670”) has “Gas over Constriction Technology” within the patented “Coil Zone” made up of internal channels used to harness gas expelled from the ammunition. “Coil Zone” channels are spun in a negative twist to stabilize the wad for even, consistent patterns and keep the tube tight in the barrel. Anaconda “STRIKER” will throw an Extra Full pattern with distances out to 60 yards. This tube is safe and effective with non-toxic shot as well as lead. 
Note: Testing done by Ballistics Performance has determined that ammunition with velocity of 1550fps and below will achieve the best results with Patternmaster Tubes.
Not for use with slug ammunition.
NOT FOR USE WITH STEEL SHOT
Patternmaster's 12ga Browning Invector/Win Choke will interchange with Browning Invector; Winchester 1200, 1300, 1400, 1500, and Ranger; Smith & Wesson; Savage; Chas Daly O/U (made in Italy); CVA; FN-SLP; H&R 1871/N.E.F; H&R Pardner Pump; H&R SB Trap; Ithaca Model 37 (current); Mossberg 9200, 500, 535, & 930; New England; Older stlyle Ruger; SKB (short style); Stoeger 200 Condor O/U; Stoeger STF 300; Stoeger Uplander; and Thompson Center. For more information about your shotgun interchange please see the firearm owner's manual or contact the firearm manufacturer.