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Standard Invector Choke Tubes Choke specifications from packaging.   Item # Ga Barrel Length Overall Length Length of Pull Drop at Comb Drop at Heel Nom. Weight MSRP 6130303 12  STANDARD INV FULL,12             $28.00 6130307 .410  STANDARD INV FULL,410             $17.00 6130313 12  STANDARD INV IMP MOD,12             $28.00 6130323 12  STANDARD INV MOD,12             $28.00 6130327 .410  STANDARD INV MOD,410             $17.00 6130333 12  STANDARD INV IMP CYL,12             $28.00 6130337 .410  STANDARD INV IMP CYL,410             $17.00 6130343 12  STANDARD INV SKEET,12             $28.00 6130347 .410  STANDARD INV SKEET,410             $17.00 6130353 12  STANDARD INV CYL,12             $28.00 Suggested retail prices are in U.S. dollars and are subject to change without notice.