GrantCunningham.com
The Revolver Specialist!
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Colt Revolvers
If I could be known for one specialty, it would be Colt revolvers.
They are what started me on the road in gunsmithing, and I've been
fortunate and grateful to have been compared to some of the
"greats" in the Colt world.
I take great pride in the work that I do; whether it's a Python or
a Police Positive, an Official Police or a Detective Special, every
gun gets the kind of "old world" treatment that is all too rare in
today's world.
Which Colt revolvers do I work on? The "D" frames - Detective
Special, Cobra, Agent, Diamondback, Police Positive series - and
the “E”/ “I” frames - Python, Officers
Model series, and Official Police. I do not work on the SF-VI, DS
II, or Magnum Carry.
The “Master” Action Tune
Colts aren’t like other guns - unless all aspects of the
action are just “right”, shootability and durability
will suffer. Through experience, I’ve learned that if some
work isn’t done because it isn't part of the
“package” you chose, your gun will never be as good as
it can be. Thus was born my Master Action Tune, and is type of
action work associated with the Colt master gunsmiths of old. This
goes far beyond even the best factory fitting; the difference is
truly phenomenal!
I start by carefully examining your gun. I measure and record every
operational aspect, and compare these measurements against factory
limits. In some cases, I have more stringent specifications than
the factory, as I’ve found that they are critical to the
gun’s longevity. (If the headspacing, cylinder gap, or
cylinder endshake are out of spec the condition(s) must be
corrected before I will commence any action work.)
On disassembly, all parts are inspected and ultrasonically cleaned.
The frame is checked for smoothness where operating parts contact;
if at all rough, the areas are smoothed.
The gun is now adjusted for perfect timing and lockup; I pay
particular attention to getting the same lockup on all cylinders,
which benefits both performance and longevity. This is done by the
time-consuming step of equalizing the star (“ratchet”)
surfaces, by hand, and test-fitting at every step. This is not a
job for the impatient!
Once the necessary repairs and adjustments have been made, I
proceed with the type of action work, available only on Colts, that
established their reputation amongst the most demanding firearms
enthusiasts. I start by smoothing all operational parts of the
action; all operational surfaces are polished to the greatest
degree allowed by their manufacture and/or condition. (If the parts
do not allow this, they will be replaced.) The geometry of the
double-action sear surfaces are changed, which helps to reduce the
characteristic Colt “stacking” (increase of pull weight
toward the end of the trigger’s travel.) This is the
“big secret” that the renowned Colt gunsmiths of old
used to deliver their best actions. (Of course, if you prefer a bit
of stack in the action, I can oblige you.) The sear surfaces are
polished to the degree of fine jewelry, resulting in the utmost
reduction in friction.
The bolt (which is the piece that pushes up into the cylinder
notches) is adjusted and polished so that when you pull the trigger
the bolt’s action is heard - yet not felt. (Try yours -
you’ll probably notice that you can feel a
“click” in the trigger; in extreme cases, you may even
see the sights move!) All of the contact surfaces of the parts
involved are treated with the same fanatical attention to detail
that the sears receive.
On guns where the single action is retained, the single-action sear
is adjusted and polished; even the surfaces that contact when the
gun is cocked for single action are finished, so that the act of
pulling back the hammer is smooth and slick. The single action is
adjusted for a smooth, no-creep letoff that is crisp, yet without
abruptness.
The cylinder’s bearing surfaces are polished to remove even
slight amounts of friction.
All of the internal springs are tensioned and balanced for both
light pull and reliable trigger reset, and the firing pin
protrusion is adjusted to ensure reliable ignition at the reduced
pull weight.
On occasion, I find cylinder locking notches that are very roughly
machined; this results in a slight “chattering” feel in
the last bit of trigger travel. If the notches are not smooth, I
polish them so that they are. Depending on your tastes, this may
require that the cylinder be refinished. (Note: I do not do
refinishing. )
As any serious revolver shooter knows, the trigger pull is only
half of the equation; the other half is the trigger return. I pay
special attention to all of the things that affect the trigger
return - smoothing it to the same degree as the pull. Not only will
the trigger reset more smoothly, it will do so faster.
The final result of all this work is a reduction in felt pull
weight, dramatic increase in smoothness, and virtual elimination of
the Colt stacking. You end up the proud owner of a trigger that is
consistent from start to end, and whose let-off is smooth and
predictable - without the sudden jarring that is present in a
lesser gun.
Believe it or not, this description doesn’t begin to cover
all of the work involved. There is much more, all aimed at one
goal: giving your Colt the best action that it can possibly
have!
It must be pointed out that the goal of the Master Action Tune is
the absolute best double-action pull available. Because of the
changes to the sear geometry to achieve that goal, the single
action will increase in pull weight - usually ending up in the
4-1/2 to 5lb range. (If you want to retain a light single action
trigger, see the "Super Action Job", below.)
(Note
on stainless and nickeled guns: Stainless and nickeled
triggers cannot be modified for stacking reduction; for these guns,
I will fit a standard carbon trigger to which the modifications are
done, and polished so that it closely matches the gun. The original
unmodified trigger is returned with the gun. There is no extra
charge other than the cost of the part.)
The
“Super Action Job"
If you prefer a gun that is tuned more to single-action shooting
than double-action, then you want the Super Action Job. It includes
everything in the Master Action Tune above,
except the traditional Colt
stacking is retained and the single action is honed for light and
crisp let-off.
Other
Popular Colt Work
Front
Sight Modification (post-1972 Detective
Special, Cobra, Agent, Police Positive Special): One of the few
complaints about the post-’72 “D” frames concerns
the ramp front sight. The long ramp, no matter how painted, tends
to “gray out” in bright lighting conditions. By
recutting the ramp to a steeper angle and serrating it, you get a
sharp clear sight picture in all conditions. (Pictures of the
reshaped sight available on request.) The job includes recutting,
serrating, and finishing the sight in red or black.
Double-Action
Only Conversion Package: Highly recommended for any
carry or duty gun, the DAO Conversion Package eliminates the
single-action cocking notch. The trigger face is polished smooth to
remove the sharp edges and the serrations, and the hammer spur is
removed (“bobbed”) so that the hammer cannot be pulled
back. I bob the hammer in a shape that both complements the lines
of the gun and retains necessary hammer mass for reliable ignition.
It does not look like your typical “bob the hammer with a
hacksaw” job! The back of the hammer is then blued (finished
to semi-matte on stainless guns) to reduce glare and distraction
when you’re pulling the trigger.
Cylinder Chamfering: To make reloading easier and
faster, the edges of the cylinder mouths are chamfered. Where
necessary, the chambers are polished. Highly recommended for carry
and duty guns!
Trigger Smoothing: The trigger face is polished
smooth to remove the sharp edges, and radiused so that it feels
superb to your trigger finger. In addition, the sharp corners on
the back side of the trigger are chamfered for complete shooting
comfort. (If desired, the width of the trigger can be reduced.)
Note: This service is included in the Double Action Only conversion
package.
Muzzle Crowning: If there is any fault of
modern revolvers, it is that the muzzles are often poorly crowned
or sometimes not crowned at all. I’ve found that a good crown
not only protects the all-important rifling, many times it improves
the accuracy as well. I cut a deep 45-degree crown, and then polish
it to a literal mirror finish - elegant enough to match the rest of
your fine machine. The effect is visually stunning.
“Dehorning”:
There are many
sharp edges on revolvers that can make handling, especially
reloading, painful - particularly when you are moving "at speed."
Dehorning gently smooths those edges so that your hands (and
clothes and holsters) won’t wear as readily. This is NOT a
“meltdown” - the edges are smooth, but the appearance
of the gun is not dramatically altered. I like to say that this is
a modification that you FEEL, but don’t SEE! This requires
that the gun be refinished, unless you like a
very “well worn”
look. (Not available on alloy
frame guns.)
Refit
Hand: Colt revolvers utilize the
hand to lock the cylinder at time of ignition; the hand pushes the
cylinder against the bolt, locking it solidly in place. A Colt
cylinder, when in full lock, should NOT MOVE AT ALL. This has been
referred to as the "bank vault lockup", and is what made the Colt
DA revolvers famous. By the nature of the design, the hand will
wear over a period of time and requires occasional replacement. The
owner is expected to check the action regularly, and have the hand
replaced when it shows any sign of wear. If the gun is used past
the point where there is discernible cylinder play, the other parts
of the action - the functions of which are all interrelated - will
experience uncharacteristic wear, and need to be replaced. This can
evolve into an expensive undertaking, and can be prevented by
having the hand refit whenever it starts to wear.
Action Restorations: I receive many requests for
action restoration and repairs on older Colts that have been
improperly serviced, or simply used beyond the limits of normal
maintenance. Since the work required in such cases varies so
widely, I will make quotations only after consultation; in some
cases, I may need to see the gun in person.