Wolff shooters pack spring kit for SP101

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bub

Single-Sixer
Joined
Jul 28, 2007
Messages
245
Location
NE Ohio
OCD, it really doesn't matter where you start, just MAKE SURE you shoot the gun to verify reliability after the switch. Personally, after gun mods, I test with CCI primers, as they tend to be among the hardest available. If the gun shoots with CCI primers, it should be OK with everything else. I also test with my carry load, but I start off with CCI and have never had a problem with this process.

I've never changed out springs in my SP, but I did play the spring game with my S&W M649. I also bought the Wolff spring kit for it. I can't remember what the weights were, but IIRC it also came with 3 mainsprings and 1 rebound slide spring, similar to the trigger return spring in an SP. I started out with the lightest and THANK GOD I tested it. None of the Wolff springs would reliably set off a primer, so I ended up back with the factory springs for reliability. Because of this, I haven't touched the factory springs on my SP, I just "tweaked" the innards for smoothness and practiced for the trigger pull weight. This is why testing is so important- imagine REALLY NEEDING the gun and it won't go off! Dead or injured OCD!

Bub
 

CraigJS

Bearcat
Joined
Nov 5, 2009
Messages
4
Location
Minnesota
OCD, please keep us updated on your spring trials. I just purchased the same spring pak for my 101. Thanks.
Be safe, Craig
 

I_Like_Pie

Blackhawk
Joined
Aug 24, 2006
Messages
659
Location
Chattanooga, TN
I have found that the 10 pound one is way too light. I have fired hundreds of rounds through the 12 pound spring and have always had solid primer strikes. Had a ouple of FTF with the 10...even more so with the rimfire versions of the SP.
 

G2

Hunter
Joined
May 8, 2006
Messages
2,257
Location
UT/AZ
IBOK + 9lb Spring and now it's super smooth, and current round count @ 1150, and not one miss fire.

This gun w/ the 14lb spring never got shot, now everybody wants a turn.
 

Snobal

Bearcat
Joined
Oct 25, 2008
Messages
40
Location
Arizona Wilderness
Suggestion: My recent "lesson learned" is that before you do anything to the SP101, get a scale so you can measure your SA and DA pull weights - you may be happy with just a "polish job." Wal-Mart has a fish scale for about $5 that works just fine.

I got a used SP101 last month, so I ordered the spring kit by the part # called for in the IBOK, and did most of the IBOK procedures.

Then I realized that I had screwed up. I wish I had measured the SA and DA pull weights prior to polishing the parts.....

Anyway, I found a fish scale works great for measuring SA & DA pull weights. I'm not going to say that the scale is "accurate," but it does give a "relative" indication of trigger pull.

Again, this SP101 is "used" and had most of the IBOK polish procedures done prior to trying the hammer spring kit. I did not bother to install the trigger return springs from the kit because the stock one suits me. Here are my results:

- 12 lb Spring, DA = 10 1/2 lbs, SA = 2 1/2 lbs

- 10 lb Spring, DA = 9 1/2 lbs, SA = 2 1/2 lbs

- 9 lb Spring, DA = 8 lbs, SA = 2 1/2 lbs

- Stock Spring, DA = 10 1/2 lbs, SA 2 1/2 lbs

I really liked the way this SP101 felt after the IBOK procedures and ended up staying with the stock spring.

Since the spring kit can be used on GP100's, I decided to use it on a "target" gun where a "FTF" would not be critical, rather than a CCW gun.
 
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