JCW (Joint Castle nut Wrench) is a dedicated, heavy duty twin
castle nut wrench, precision CNC machined from 4140 steel, heat treated
and black oxided, it's something we've always wanted and needed. We
couldn't find one we liked, so we answered our own prayers and made it.
Like
many AR users, we used either a heavy and unwieldy armoror's wrench, or
a cheap stamped sheet metal castle nut wench that couldn't be used with
a torque wrench, both work, but neither is great. One is overkill, the
other is barely adequate.
The handy JCW
combines two castle nut wrenches in one. On one end, it has a
conventional 3 lug castle nut wrench, spanning 180 degrees. On the
other end, it has a unique two lugs wrench, spaced only 90 degrees
apart. JCW measures 3.5"x 1.84" (at its widest), but is surprising
heavy at
3.14oz, due to its 4140 steel construction. JCW was designed from the
start to be used with a torque wrench.
On some
end plates with QD swivel sockets, the sockets housing masks a good
portion of the castle nut's circumference, and there are occasions where
not all 3 wrench notches are accessible. Our own ESF (End plate, Sling
adapter, Forward Controls) covers up 1/4 of the castle nut's
circumference (ESF's QD swivel housing acts as a backdrop to ensure it
won't bend under unforeseen pulling force) JCW's 2 lug wrench is
designed specifically for this task.
JCW has a
center socket for use with a torque wrench (1/2" drive). TM calls for
38 to 42 ft/Lb of torque to be applied to the castle nut prior to
staking in two places, this torque value is conveniently engraved on the
JCW as well.
JCW, like CBW (Combined Barrel nut Wrench) and JMW (Joint Muzzle device Wrench) requires a torque wrench with 1/2" drive.
JCW is proudly designed and made in the US, it is a collaboration between Forward Controls Design and Arson Machine Co, OR.
RE:
torque value, it is 38 to 42 ft lb, with no adjustment needed for the
1" of length between the center of the 1/2 drive and the lugs. Our good
friend Chad Albreach of SOTAR (School of the American Rifle) has stated
thus:
The USGI Castle Nut Wrench has the same distance from the wrench surface to the 1/2 adaptor as the FCD wrench does. The military technical manuals take into account the extra length the USGI tools have when coming to the 38-42 FT# value.
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