screw-in choke tubes are made of high-grade steel for corrosion resistance and durability with special heat treatment. BERIKA® Over & Under Shotgun is supplied together with 5 mobile choke tubes. These chokes have 1 notch to 5 notches in their top rim for different purposes. SEMI AUTOMATIC Shotgun is supplied together with 3 mobile choke tubes. These chokes have 1, 3 and 5 notches in their top rim for different purposes. For other chokes (2 and 4 notches) please contact BERIKA® distributor.All BERIKA® MOBILE CHOKE tubes are designed for use with factory cartridges loaded to standard specifications.
BERIKA® MOBILE CHOKES tubes are also inscribed on the side with the patterns F, IM, M, IC, CL they produce with lead shot. BERIKA® MOBILE CHOKES tubes are fully interchangeable. You can use them with other BERIKA® products.
WARNING: DO NOT USE BERIKA-CHOKE® TUBES IN ANY SHOTGUN BARRELS NOT SUPPLIED BY BERIKA®. ALSO, DO NOT USE ANY OTHER CHOKING DEVICE IN ANY SHOTGUN BARRELS SUPPLIED BY ARMAS HUNTING FIREARMS & FOREIGN TRADE CO.
BERIKA® MOBILE CHOKE CODES (DEFINITION)
To identify BERIKA® MOBILE CHOKE tubes, use the identification mark(s) located on the top rim of each tube. These notches are a code to allow you to determine the choke designation while the tube is installed.
BERIKA® MOBILE CHOKE TUBE SELECTION
To help you choose the correct choke tube for each hunting situation, all BERIKA® MOBILE CHOKE tubes are inscribed on the side with the patterns they produce with lead shot. The notches on the rim and pattern designation on the side are only for lead shot. For steel shot you will need to use the cart below to cross-reference from lead to steel and determine appropriate tubes for your ammunition and hunting/shooting situation. Since steel shot generally patterns tighter than conventional lead shot loads, it would be wise to avoid the use of steel shot altogether in conventionally choked "FULL CHOKE" barrels. "MODIFIED CHOKE" barrels generally deliver "FULL CHOKE" patterns when used with steel shot.
WARNING: Whenever handling any shotgun for the purpose of removing or installing a choking device, make absolutely certain the gun is fully unloaded, and the action is open. Never attempt to remove or install a shotgun choking device on a loaded firearm.
| Standard Markings |
American Designation (Pattern with Lead Shot) |
Rim Notches | Compatibility with Steel Shot | Pattern with Steel Shot |
| 0 (*) | F (Full) | I | Not Recommended | - |
| 00 (**) | IM (Improved Modified) | II | Not Recommended | - |
| 000 (***) | M (Modified) | III | Recommended | F |
| 0000 (****) | IC (Improved Cylinder) | IIII | Recommended | M |
| C 0000 (*****) | CL (Cylinder) | IIIII | Recommended | IC |
REMOVAL OF CHOKE TUBES
WARNING: Check the firearm is unloaded. If not, unload the firearm by operating as described in the chapter "Unloading the shotgun".
WARNING: Never look into the muzzle or change tubes on a loaded gun, even with safety engaged.
1. Either open the action or lift the barrel out of the receiver.
2. Unscrew (counterclockwise) the choke tubes with the BERIKA® choke tube wrench supplied. Remove the choke tubes from the muzzle.
CLEANING OF CHOKE TUBES
WARNING: Check the firearm is unloaded. If not, unload the firearm by operating as described in the chapter "Unloading the shotgun".
WARNING: Never look into the muzzle or change tubes on a loaded gun, even with safety engaged.
1. Either open the action or lift the barrel out of the receiver.
2. Carefully clean the choke housing. If necessary, use a cotton patch coated with gun oil.
3. Check the choke to make sure it is perfectly clean inside and outside.
4. Apply a thin coat of gun oil to the threads of the barrels and of the choke tubes.
INSTALLATION OF CHOKE TUBES
WARNING: Check the firearm is unloaded. If not, unload the firearm by operating as described in the chapter "Unloading the shotgun".
WARNING: Never look into the muzzle or change tubes on a loaded gun, even with safety engaged.
1. Either open the action or lift the barrel out of the receiver.
2. Apply a thin coat of gun oil to the threads of the barrels and of the choke tubes.
3. Insert the desired chokes into the choke housings.
4. Carefully hand screw the chokes into the barrels clockwise. Using the BERIKA® choke tube wrench tighten the chokes until they are fully bottomed into their recesses in the barrels.
5. Remove the choke tube wrench after tightening.
WARNINGS