Originally Posted by laidlerj
I checked the Ruger website and my owner's manual - both agree that there is only one mainspring for all SP101 models - part # KW00401. Where did you find different part numbers?
Interesting, there was an addendum listed there when I wrote that and I got a hard copy with the documentation for my new 4" 357 SP101. Don't know why the addendum has disappeared from the site. They didn't update full manual yet either, witness there being none of the other 22 specific parts, like a 8 shot 22 cylinder.
INSTRUCTION MANUAL INSERT FOR
8-SHOT ~ .22 LONG RIFLE CALIBER
NOTE: With the exception of its capacity and caliber, the 8-shot RUGER® SP101®
has the same basic operational characteristics as all other SP101 revolvers. Please refer
to page 11 in the instruction manual for Ammunition information. Other features of
this revolver include a Hi-Viz® front sight, and adjustable rear sight.
Rimfire ammunition manufacturers use different types of brass for their cases and different
lubricants on their bullets. As a result of these variations, some rimfire ammunition
can cause extraction issues in double-action revolvers. If a particular type of
rimfire ammunition is causing extraction problems, then first clean the gun in accordance
with the instruction manual (see p. 22). If extraction issues persist, then try
another brand or type of rimfire ammunition.
ADJUSTABLE REAR SIGHT
NOTE: Each click of the rear sight adjustment screws (either windage or elevation)
will move the point of impact of the bullet approximately 3/4” at a distance of 25
yards. Move the rear sight in the direction you desire the bullet to move on the target.
To raise point of impact: turn screw counterclockwise.
To lower point of impact: turn screw clockwise.
To move the point of impact to the right:
turn screw counterclockwise.
To move the point of impact to the left:
turn screw clockwise.
SUPPLEMENTAL PARTS LIST
Key Part Name Part No. Model
† 1 Frame KW00216 KSP-242-8
* 2 Cylinder, 8-shot KW00133 KSP-242-8
* 3 Ejector KW01823 KSP-242-8
* 4 Barrel KW00643 KSP-242-8
5 Rear Sight Elevation Screw W05911 KSP-242-8
6 Rear Sight Blade W05917 KSP-242-8
7 Transfer Bar KW01703 KSP-242-8
8 Rear Sight Cross Pin KW05913 KSP-242-8
9 Rear Sight Elevation Spring KW05914 KSP-242-8
10 Rear Sight Windage Spring KW05915 KSP-242-8
11 Front Sight, HiViz® W03610 KSP-242-8
12 Grip Panel Insert, Left W01030L KSP-242-8
13 Grip Panel Insert, Right W01030R KSP-242-8
14 Rear Sight Base W15900 KSP-242-8
15 Rear Sight Windage Screw W05912 KSP-242-8
16 Grip Panel Screw KW01300 KSP-242-8
* 17 Firing Pin KW02112 KSP-242-8
18 Mainspring KW00403 KSP-242-8
† The frame is a serial-numbered part and is not offered for sale.
* Parts so marked must be factory fitted.