Mounting Your Receiver Mounted Skinner Sight
(All Mounting Screws and Hex Wrenches are supplied)
A. Double check to insure your gun is unloaded.
B. Use a small screwdriver to remove any sight filler screws that may be in the threaded holes needed to mount your sight.
C. Clean and dry the holes if needed. We do not recommend either oil OR loctite on the screws used for mounting.
D. Mount the sight to the firearm using the screws and wrenches supplied.
E. Check to insure the screws do not protrude into the receiver far enough to interfere with proper bolt operation. (If they are slightly long, file or carefully grind off a couple threads)
F. Orient the aperture stem square with the receiver and tighten the right hand set screw.
(do not over tighten, just enough to lock the stem from turning)
G. Gently tighten the center set screw to hold the dovetail slide in place. Your sight should now be ready to use!
Mounting The Barrel Mount Dovetail Sight
(Adjustment hex keys are supplied)
1. The dovetail may be a few thousandths larger than the slot it should fit.
2. Check the inner corner relief first. The sight will have sharp corners and may need to
be filed a bit to match the corners of the dovetail slot on barrel.
3. If you cannot start the sight by pushing it into the slot it may be necessary to use a
small triangular file to remove a small amount of metal before the sight will fit.
Remove the metal from ONE of the sloped sides of the sight. A triangular file has a
60 degree slope which is the same as the slope on the sight. When you can start the
sight in the slot by hand go to step 4.
4. Use a BRASS PUNCH to tap the sight to the center of the barrel.
5. The peep is adjusted for elevation by turning it on its threaded shaft. It is secured
by a set screw on the side of the sight.
6. The aperture can be removed for a "Ghost Ring" which works well with this sight.
Fitting A Front Sight
Remove the front sight from the rifle using a brass punch
and a mallet. Drift the sight from left to right (as viewed from the rear sighting down the barrel)
Hold the new sight to the right side of the slot and try to start the sight. If it will start then drift it into center position using the brass punch
and mallet. If you cannot start it by hand, you will need to use a small triangular file to remove some metal. Very little filing will be necessary. File a couple of strokes then check.
File only on the sloped side of the SIGHT dovetail and only file on one of the two surfaces.
THE DOVETAIL ON THE SIGHT IS MADE SLIGHTLY OVERSIZE DUE TO VARIATIONS IN WIDTHS OF THE DOVETAIL SLOT ON THE GUN.
The goal is a firm friction fit that cannot be moved by hand, but can be moved with gentle taps of a punch and mallet.
CLICK THIS LINK FOR AN ONLINE CALCULATOR
TO FIGURE SIGHT CHANGE AMOUNTS
FRONT SIGHT HEIGHT CALCULATOR
OR... Figure it yourself with the following equation.
When you are unable to adjust the rear sight to work for your rifle because the rifle shoots high you will need a taller front sight. To eliminate the guesswork, you can calculate the additional height needed using the procedure below.
1. Shoot your rifle at a known range (say 50 yards). Note the distance you need the impact to change (say 6 inches lower).
2. Measure the sight radius of your rifle (22 inches on most Marlins).
3. The change needed is calculated by changing all measurements to inches then multiply the sight radius by the desired change in impact and divide that product by the range in inches.
4. The result is the additional height needed for the front sight. To get the height of the new front sight add the current height and the calculated number from (3).
I need to shoot 6 inches lower at 50 yards with my 1894, 44 Mag. With a 22 inch sight radius. My current front sight is .350” tall from the bottom of the dovetail to the top of the sight.
50 yards = 50X36=1800 inches
Desired height change is = 22 (sight radius)X6 (desired change)/1800(range)=.073 inches. My new front sight needs to be .350+.073 or .423 inches tall.
OR.... MAKE IT SIMPLE
To move the impact at 100 yards on a Marlin rifle with a 20" barrel requires .006" of sight change. (front or rear)
If you are shooting 6" low at 100 yards, your front sight needs to be "Trimmed" .036" shorter or the rear stem turned up 1 1/2 turns.
If you are shooting 6" high at 100 yards your front sight needs to be .036" taller or the rear stem turned down 1 1/2 turns. (If your stem is already at the lowest position a taller front sight is required)
If you are shooting at a shorter range than 100 yards adjust accordingly.
50 yards = 2 times the change needed. (.012" for 1" correction)
25 yards = 4 times the change needed. (.024" for 1" correction)
Removing the Factory Rear Sight
Holding the rifle firmly in a padded vise, use a
BRASS PUNCH to remove the factory rear sight, left to right as viewed looking down the barrel.
(Be careful not to mar or
damage the barrel or wood) Fill the exposed dovetail
slot with a DOVETAIL SLOT BLANK from our SPECIAL ITEM page.
Our dovetail blanks require just
a bit of hand fitting to go into
Every dovetail is different so this
helps insure a perfect fit!
A few strokes off the flat
bottom of the blank and
a little filing of one slope on
the blank should allow you to
insert it about 1/2 way before
tapping it the rest of the way
with your punch.