Product Description
Specs
Warranty
Thread your 12ga barrel for choke tubes/ suppressor adapters.
*Threading service only, no choke tube will be provided or installed.*
*Please note, after threading barrels will need to be refinished (cerekote, blueing, etc)
Please mail your shotgun barrel to the address below with a printout of your completed order.
JK Armament
8590 Old Hwy #30
Hammett, ID 83627
Product Specs
SCREW-IN CHOKE INSTALLATION REQUIREMENTS
Before accepting a barrel for machining to accept screw-in chokes, you must measure the outside diameter (O.D.) to determine
if there will be sufficient wall thickness after machining. “Mike” the O.D. of the barrel and the O.D. of the tap for the particular
gauge. Subtract the O.D. of the tap from that of the barrel, divide by 2, and this will give the wall thickness after machining,
providing the O.D. of the barrel is concentric with the inside diameter (I.D.). A sample calculation appears below.
Barrel O.D. (12 Gauge) .850"
Tap O.D. (12 Gauge) Win-Choke™ – .814"
.036" ÷ 2 = . 018" Wall Thickness
We DO NOT recommend installations in barrels where the resultant wall thickness will be less than .015", providing the I.D. of
the barrel is concentric with the O.D. If the I.D. is not concentric with the O.D., you will have to make your own decision as to
whether the installation will be safe. In addition, you CANNOT install screw-in chokes in barrels whose inside diameters (I.D.)
exceed the following dimensions: 10 ga. - .780"; 12 ga. - .735"; 12 ga. Thinwall - .728"; 16 ga. - .666"; 20 ga. - .624". Exceeding these
dimensions WILL CAUSE DAMAGED CHOKE TUBES and there is a GREAT POSSIBILITY OF CAUSING A BARREL BLOW-OUT!
Check EVERY installation before firing to make sure the tube does not protrude into the bore. Back-bored or jug-choked barrels
are usually NOT suitable for screw-in choke installation.
LIFETIME GUARANTEE
Pride and quality workmanship goes into all of our American-made, JK products, and we stand behind them! WE GUARANTEE OUR PRODUCTS FOR LIFE!
*For more information please see our product manual.*