Williams Foolproof (FP)
Sights
Williams Foolproof Installation and Instructions [5D similar]
Williams FoolProof parts and apertures
ADJUSTMENT AND USE (DIA.1): The Williams Foolproof receiver sight employs
micrometer adjustments to move the sight aperture; thus moving your point of impact (POI). Average click adjustment equals .15 minute of angle/-click but is contingent on sight radius.
Sight graduation markings are referential only and do not necessarily equate to any distance or adjustability. Not every FP model will adjust through all the graduations. lf the sight will not zero within adjustability, your firearm will require a different height front sight.
| 1.
Sight Base 2. Sight Top 3. Attaching Screws 4. Elevation Adjustment Screw 5. Windage Adjustment Screw |
6.
Aperture Holder 7. Aperture 8. Windage Locking Screw 9. Elevation Locking Screw 10. Gib Lock / Gib Lock Screw |
Elevation Supporting Screw [early FoolProof ?]
This screw is missing from all of the FoolProof sights that I have ever seen. How old this illustration is, I don't know.
"After the FoolProof sight is fully adjusted [sights and POI are the same. Ed.], tighten the locking screws and the Gib lock screw. Then lower the Elevation Supporting Screw to set down on the receiver. The sight is now locked and foolproof."
CAUTION: Locking Screws (#8, #9) should be backed off 1/4 turn only. This is all that is necessary to allow elevation and windage screws to be unlocked. Turning these screws more than one turn [out ?] may disengage the elevation and windage screws making it impossible to adjust until the locking screws are restored to proper position. These lock screws are precision made. It is not necessary to apply excessive force to lock windage and elevation solid.
Windage:
- Loosen windage locking screw (#8) by turning it counter-clockwise.
CAUTION: FP Locking screws should be backed off 1/4 turn only.
- Turn windage adjustment screw/knob (#5) CCW to move POI right; CW for left.
NOTE: The windage adjustment screw/knob is reverse threaded.
NOTE: Adjustments are reversed on right side mounted FP sights.
- Retighten locking screw. Windage locking screw should be tight for every shot.
NOTE: The windage locking screw applies forward pressure against the windage adjustment screw/knob which helps to stabilize the aperture holder.
Elevation:
- Loosen elevation locking screw (#9) by turning it counter-clockwise.
NOTE: The elevation locking screw can be loose during shots taken.
- Loosen gib lock screw 1/4-1/2 counter-clockwise turn.
- Turn elevation adjustment screw/knob (#4) CCW to move POI up; CW for down.
- Retighten gib lock screw. The gib lock should be tight for every shot.
NOTE: The gib lock provides rigidity between the base and the top.
- After you zero your elevation, retighten the elevation locking screw.
PREVENTATIVE MAINTENANCE: (DIA.1)
The Williams FP Receiver Sight is made of the highest grade aluminum alloy
obtainable. Lubrication of the sight is just as important as the rifle.
- Remove windage and elevation locking screws (#8 & 9).
- Place a drop of oil in each of the holes.
- Replace the locking screw to force oil through all working parts.
- Remove gib lock and gib lock screw (#10) and clean thoroughly.
NOTE: Do not lubricate these components.
- It is unnecessary to remove the elevation and windage adjustment screws
(#4 & 5). They are held in by a small spring and ball bearing (see diagram 2).
FP Adjustment Screw Assembly
| 1.
Windage / Elevation adj screw / knob 2. Click Spring |
3.
Steel click-ball bearing 4. FoolProof Locking Screw |
NOTE: The windage adjustment screw/knob is reverse threaded.
NOTE: Adjustments are reversed on right side mounted FP sights.
NOTE: Windage locking screw should be tight for every shot.
NOTE: The windage locking screw applies forward pressure against the windage adjustment screw/knob which helps to stabilize the aperture holder.
Gib Lock Assembly
| 5.
Gib Lock [angular lock bushing] |
6.
Gib Screw [or Knob] |
NOTE: The gib lock should be tight for every shot.
NOTE: The gib lock provides rigidity between the base and the top.
Common FoolProof Parts
The following is a quick list of common FP parts, taken from the Williams' Gun Sight Company, Retail Price List, 1 January 2014.
All Foolproof sights (except TK models) use the Short Elevation Knob. The Long Elevation Knob is for use with FoolProof-TK target sights. NOTE: I take this with a grain of salt, some FP sights have long windage, like that for the Knight BK-82 / MK-82 muzzleloader.
FP / 5D Parts
11515 FP Base only (Specify model)
11516 FP Top Only (Specify Model)
11530 5D Base Only (Specify Model)
11532 5D Aperture Holder
43597 5D Aperture Holder Screws (6-48 X .285)
11517 FP/5D Angular Locking Bushing
31544 FP/5D Angular Locking Bushing Screw (6-48 X .285)
61613 FP Target Elevation Gib Lock Knob ("Marlin 6-48 Giblock" # 061613)
11518 FP Short Windage Screw
11519 FP Long Windage Screw
11520 FP Standard Elevation Screw
11521 FP All-Purpose Elevation Screw
11522 FP 81 Long Elevation Screw
15753 FP TK Short Windage Screw
15752 FP TK Long Windage Screw
11524 FP TK All Purpose Elevation Screw
11525 FP TK Long Elevation Screw
11527 FP Ball (.125" dia)
11526 FP Spring
43598 FP Elevation/Windage Locking Screw (little tiny things, 3-56?)
11528 FP Aperture Holder
14801 FP Blank Blade
43599 5D-RU Top (Old Style), Ruger 44RS Receiver (w/std Aperture & Holder)
1443 FP (Shotgun) Big Game Aperture (.3125 ID)
1444 5D (Shotgun) Big Game Aperture (.3125 ID)
11529 FP Square Notched Blade (seen on FP-T/C)
????? Stop screw - 5D only - set screw to return upper staff to same position
Elevation and Windage screw lengths-
The elevation knob length is not critical, since any extra length passes through the bottom of the base. The windage knob length IS critical since the screw length is limited by the elevation screw. Something I learned while pondering why the windage screw would not seat.
Measure the windage screw from top of the original screw to the tip of the screw.
If it is @ 1.10" long, it uses the normal windage screw.
Target Windage Knob, Short Williams # 15753
If it is @1.25" long, it uses the LONG Target Knob windage screw.
Target Windage Knob, Long Williams # 15752
SHOTGUN / BIG GAME aperture (big aperture, .3125 ID)
FP-SQUARE NOTCH BLADE - used for events requiring open sights, like silhouette.
REGULAR SERIES -Buckbuster – Standard – Target Apertures
Williams discs are standard thread size (7/32x40) and will accommodate Redfield, Lyman, etc.
Regular, Standard, and Target Apertures:
1425 R-3/8 x .050 ... 3/8” x .050
13051 R-3/8 x .050 ... 3/8” x .050 Long Shank (WGRS)
1426 R-3/8 x .093 ... 3/8” x .093 (STANDARD)
1427 R-3/8 x .093 ... 3/8” x .093 (STANDARD) Long Shank (WGRS)
1428 R-3/8 x .125 ... 3/8” x .125 (BUCKBUSTER)
1429 R-3/8 x .125 ... 3/8” x .125 (BUCKBUSTER) Long Shank (WGRS)
44561 R-3/8 x .150 ... 3/8” x .150 [not a Buckbuster?] Long Shank (WGRS)
51104 R-3/8 x .150 ... 3/8” x .150
1430 R-1/2 x .050 ... 1/2” x .050
1431 R-1/2 x .093 ... 1/2” x .093
1432 R-1/2 x .125 ... 1/2” x .125
49891 R-1” x .050 ...... 1” x .050 (TARGET)
- Long shanks are used with WGRS Receiver Sights
TWILIGHT SERIES Apertures
Twilight apertures are designed for shooting under poor light conditions, early morning, late evening, and other inclement conditions. They create a sharp contrast that gives quick definition to the aperture hole, and they eliminate the “fuzz” with which many shooters have trouble.
These apertures are perhaps the greatest development in metallic sights in the last three decades – positive sighting when the light is poor but the hunting best. Williams ‘Twilight’ apertures will accommodate Redfield, Lyman, etc.
1435 TW-3/8 x .050 ..... 3/8” x .050
13052 TW-3/8 x .050 ..... 3/8” x .050 Long Shank (WGRS)
1436 TW-3/8 x .093 ..... 3/8” x .093
1437 TW-3/8 x .093 ..... 3/8” x .093 Long Shank (WGRS)
1438 TW-3/8 x .125 ..... 3/8” x .125
1439 TW-3/8 x .125 ..... 3/8” x .125 Long Shank (WGRS)
44562 TW-3/8 x .150 ..... 3/8” x .150 Long Shank (WGRS)
51105 TW-3/8 x .150 ..... 3/8” x .150
1440 TW-1/2 x .050 ...... 1/2” x .050
1441 TW-1/2 x .093 ...... 1/2” x .093
1442 TW-1/2 x .125 ...... 1/2” x .125
- Long shanks are used with WGRS Receiver Sights
FP Target Attaching Bases
1226 Target-FP #540
1229 Target-FP #75
1235 Target-FP #64
47478 Target Globe Sight w/Inserts (.545 high from center, not including base)
47620 Globe Sight Attaching Base - Dovetail (Low) .220
47621 Globe Sight Attaching Base - Dovetail (High) .465
47622 Globe Sight Attaching Base - Screw On Height .300, Radius .300
47623 Globe Sight Attaching Base - Screw On Height .450, Radius .350
47624 Globe Sight Attaching Base - Screw On Height .215, Radius .400