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| Marble Arms ® Front Sights |
| Gun Sight Specifications/Maintenance |
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| Front Sight Chart |
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| Sight Height |
Sight Width |
Description |
Color |
1/16” Bead Mfg# |
3/32” Bead Mfg# |
| .260” |
.340” |
26MR (Ramp Style) |
Gold |
502621 |
602621 |
| .260” |
.340” |
26MR (Ramp Style) |
Ivory |
502622 |
602622 |
| .290” |
.340” |
29MR (Ramp Style) |
Gold |
502921 |
602921 |
| .290” |
.340” |
29MR (Ramp Style) |
Ivory |
502922 |
602922 |
| .312” |
.340” |
31MR (Ramp Style) |
Gold |
503121 |
603121 |
| .312” |
.340” |
31MR (Ramp Style) |
Ivory |
503122 |
603122 |
| .312” |
.531” |
31W |
Gold |
103131 |
603131 |
| .312” |
.531” |
31W |
Ivory |
103132 |
203132 |
| .343” |
.340” |
34MR (Ramp Style) |
Gold |
503421 |
603421 |
| .343” |
.340” |
34MR (Ramp Style) |
Ivory |
503422 |
603422 |
| .343” |
.531” |
34W |
Gold |
103431 |
203431 |
| .343” |
.351” |
34W |
Ivory |
103432 |
203432 |
| .375” |
.340” |
37MR (Ramp Style) |
Gold |
503721 |
603721 |
| .375” |
.531” |
37MR (Ramp Style) |
Ivory |
503722 |
603722 |
| .375” |
.531” |
37W |
Gold |
103731 |
203731 |
| .375” |
.531” |
37W |
Ivory |
103732 |
203732 |
| .410” |
.340” |
41MR (Ramp Style) |
Gold |
504121 |
604121 |
| .410” |
.340” |
41MR (Ramp Style) |
Ivory |
504122 |
604122 |
| .410” |
.531” |
41W |
Gold |
104131 |
204131 |
| .410” |
.531” |
41W |
Ivory |
104132 |
204132 |
| .450” |
.340” |
45MR (Ramp Style) |
Gold |
504521 |
604521 |
| .450” |
.340” |
45MR (Ramp Style) |
Ivory |
504522 |
604522 |
| .450” |
.531” |
45W |
Gold |
104531 |
204531 |
| .450” |
.531” |
45W |
Ivory |
104532 |
204532 |
| .500” |
.340” |
50MR (Ramp Style) |
Gold |
505021 |
605021 |
| .500” |
.340” |
50MR (Ramp Style) |
Ivory |
505022 |
605022 |
| .500” |
.531” |
50W |
Gold |
105031 |
205031 |
| .500” |
.531” |
50W |
Ivory |
105032 |
205032 |
| .530” |
.340” |
53MR (Ramp Style) |
Gold |
505321 |
605321 |
| .530” |
.340” |
53MR (Ramp Style) |
Ivory |
505322 |
605322 |
| .530” |
.531” |
53W |
Gold |
105331 |
205331 |
| .530” |
.531” |
53W |
Ivory |
105322 |
205332 |
| .570” |
.531” |
57W |
Gold |
105731 |
205731 |
| .570” |
.531” |
57W |
Ivory |
105732 |
205732 |
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| Front Sight Chart/Fiber Optic 3/32" Bead |
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| Sight Height |
Width |
Description |
Fiber Optic Color |
Mfg# |
| .312” |
.340” |
31MR (Ramp Style) |
F/O Orange |
603125 |
| .312” |
.340” |
31MR (Ramp Style) |
F/O Green |
603126 |
| .312” |
.531” |
31W |
F/O Orange |
203135 |
| .312” |
.531” |
31W |
F/O Green |
203136 |
| .343” |
.340” |
34MR (Ramp Style) |
F/O Orange |
603425 |
| .343” |
.340” |
34 MR (Ramp Style) |
F/O Green |
603426 |
| .343” |
.531” |
34W |
F/O Orange |
203435 |
| .343” |
.531” |
34W |
F/O Green |
203436 |
| .375” |
.340” |
37MR (Ramp Style) |
F/O Orange |
603725 |
| .375” |
.340” |
37MR (Ramp Style) |
F/O Green |
603726 |
| .375” |
.531” |
37W |
F/O Orange |
203735 |
| .375” |
.531” |
37W |
F/O Green |
203736 |
| .410” |
.340” |
41MR (Ramp Style) |
F/O Orange |
604125 |
| .410” |
.340” |
41MR (Ramp Style |
F/O Green |
604126 |
| .410” |
.531” |
41W |
F/O Orange |
204135 |
| .410” |
.531” |
41W |
F/O Green |
204136 |
| .450” |
.340” |
45MR (Ramp Style) |
F/O Orange |
604525 |
| .450” |
.340” |
45MR (Ramp Style) |
F/O Green |
604526 |
| .450” |
.531” |
45W |
F/O Orange |
204535 |
| .450” |
.531” |
45W |
F/O Green |
204536 |
| .500” |
.340” |
50MR (Ramp Style) |
F/O Orange |
605025 |
| .500” |
.340” |
50MR (Ramp Style) |
F/O Green |
605026 |
| .500” |
.531” |
50W |
F/O Orange |
205035 |
| .500” |
.531” |
50W |
F/O Green |
205036 |
| .530” |
.340” |
53MR (Ramp Style) |
F/O Orange |
605325 |
| .530” |
.340” |
53MR (Ramp Style) |
F/O Green |
605326 |
| .530” |
.531” |
53W |
F/O Orange |
205325 |
| .530” |
.531” |
53W |
F/O Green |
205326 |
| .570” |
.531” |
57MR (Ramp Style) |
F/O Orange |
205725 |
| .570” |
.531” |
57MR (Ramp Style) |
F/O Green |
205726 |
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| *Height measured from top of bead to bottom of Dovetail. |
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| Front Sight Ramp With Dovetail Slot |
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| Barrel Diameter |
Sight Height |
Mfg# |
| 0.625 |
.100” |
072310 |
| 0.6875 |
.100” |
072311 |
| 0.875 |
.100” |
072312 |
| Flat |
.100” |
072313 |
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| Barrel Diameter |
Sight Height |
Mfg# |
| .625” |
.225 |
072330 |
| .6875” |
.225” |
072331 |
| 0.875 |
.225” |
072332 |
| Flat |
.225” |
072333 |
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| *Height measured from bottom of radius to bottom of Dovetail. |
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| Ruger® Style Pistol Fiber Optic Front Sights |
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| Fiber Optic Model |
Sight Height |
Green Mfg# |
Orange Mfg# |
| Super Redhawk .44 Mag., GP-100 |
.332” |
101003 |
101002 |
| Super Redhawk .454 Casull |
.310” |
101005 |
101004 |
| Super Redhawk .480 Ruger |
.390” |
101007 |
101006 |
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| Fiber Optic Uni-Ramp Front Sights |
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| Barrel Diameter |
Sight Height |
F/O Orange Mfg# |
F/O Green Mfg# |
| .625” |
.405” |
072400 |
072401 |
| .625” |
.470” |
072402 |
072403 |
| .750” |
.405” |
072404 |
072405 |
| .750” |
.470” |
072406 |
072407 |
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| Calculating Rear & Front Sight Height Combination |
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| 1. Measure the diameter of the barrel at the point of the rear sight
upright and at the point of front sight bead (example: 1.00” rear
sight and .750” front sight). |
| 2. Divide the diameters by 2 (example: 1.00” /2=.500”). This is
the distance from the center line of the barrel to the top of the
barrel. |
| 3. Check the rear sight height adjustment chart for the middle
adjustment height (example: Large Low #20 sight adjusts from
.420” to .520”). So .470” is the mid point. |
| 4. Add the mid point adjustment to the center line distance
(example: .470”+.500”=.970”). |
| 5. Subtract the front sight center line figure from the rear sight
height (example: .970”-.375”=.595”). |
| 6. You need a combination of front ramp and front sight with the
height of .595”. Ramps are measured from the base to the
bottom of the dovetails. Front sights are measured from the
bottom of the dovetail to the top of the bead. |
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| Distance Between Front & Rear Sights |
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| Amount of Adjustment Necessary to Correct |
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14" |
15" |
16" |
17" |
18" |
19" |
20" |
21" |
22" |
23" |
24" |
25" |
26" |
27" |
28" |
29" |
30" |
31" |
32" |
33" |
34" |
| *1” |
0.0038 |
0.0041 |
0.0044 |
0.0047 |
0.005 |
0.0053 |
0.0055 |
0.0058 |
0.0061 |
0.0064 |
0.0066 |
0.0069 |
0.0072 |
0.0074 |
0.0077 |
0.008 |
0.0082 |
0.0085 |
0.0088 |
0.0091 |
0.0093 |
| *2” |
0.0078 |
0.0083 |
0.0089 |
0.0094 |
0.01 |
0.0105 |
0.0111 |
0.0116 |
0.0122 |
0.0127 |
0.0133 |
0.0138 |
0.0144 |
0.0149 |
0.0155 |
0.016 |
0.0156 |
0.0171 |
0.0177 |
0.0182 |
0.0188 |
| *3” |
0.0117 |
0.0125 |
0.0133 |
0.0142 |
0.015 |
0.0159 |
0.0167 |
0.0175 |
0.0184 |
0.0192 |
0.0201 |
0.0209 |
0.0217 |
0.0226 |
0.0234 |
0.0243 |
0.0251 |
0.0259 |
0.0268 |
0.0276 |
0.0285 |
| *4” |
0.0155 |
0.0167 |
0.0178 |
0.0189 |
0.02 |
0.0211 |
0.0222 |
0.0234 |
0.0244 |
0.0255 |
0.0266 |
0.0278 |
0.0289 |
0.03 |
0.0311 |
0.0322 |
0.0333 |
0.0344 |
0.0355 |
0.0366 |
0.0377 |
| *5” |
0.0194 |
0.0208 |
0.0222 |
0.0236 |
0.025 |
0.0264 |
0.0278 |
0.0292 |
0.0306 |
0.0319 |
0.0333 |
0.0347 |
0.0361 |
0.0375 |
0.0389 |
0.0403 |
0.0417 |
0.0431 |
0.0445 |
0.0458 |
0.0472 |
| *6” |
0.0233 |
0.025 |
0.0267 |
0.0283 |
0.03 |
0.0317 |
0.0333 |
0.035 |
0.0367 |
0.0384 |
0.040 |
0.0417 |
0.0434 |
0.045 |
0.0467 |
0.0484 |
0.05 |
0.0517 |
0.0534 |
0.0551 |
0.0567 |
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| *Amount of error at 100 yards is given in inches |
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| Front Sight Elevation Correction Chart |
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| How to Use Table Above-Suppose a rifle, having a sighting radius of 24” between front sight and receiver sight, shoots 6” high at
100 yards, even with the rear sight adjusted as low as possible. Remove front sight and measure overall height, preferable with a
micrometer. This might be .410”, such as a Marble No. 41MR. Reference to columns for 24” and 6” on table above will show a
necessary correction of .040”. This would mean a new, higher front sight (with an overall height of .410” plus .040” for a correction
height of .450”) such as a Marble No. 45MR, should be installed. |
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| Sighting in should be done with a bench rest or prone with a sand bag or other rest for the rifle. Do not put rifle barrel or forearm
directly on solid surface, but put the back of your hand or wrist on the rest and hold forearm of the rifle securely in your hand with
approximately the same tightness of grip you would use when shooting at running game. If the firearm or barrel is rested directly on
the sand bag or rest, the rifle will shoot higher than when held firmly while shooting at game as more “muzzle flip” will occur. |
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| Return to Front Sight Product Page |
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| * Marble Arms does not sell customer direct. To find a retailer near you please visit our Distributor page. |
