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This is a discussion on SP101 Main Spring within the Gunsmithing forums, part of the Firearm Forum category; With my trusty Iowegan Gun Guide in hand, if I choose to replace the spring, the 12# spring is a good compromise. Anyone use a ...


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Old October 18th, 2010, 06:16 AM   #1
 
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SP101 Main Spring

With my trusty Iowegan Gun Guide in hand, if I choose to replace the spring, the 12# spring is a good compromise.

Anyone use a 10# spring and if so, any problems with light primer hits or issues with slower lock time?

Thanks!

IOWEGAN --- the Guide Supplement lists Reduced Power Spring Kit #349 / Brownells P/N 965-349-000. I see this is a Wilson Combat product, should I consider a Wolff spring, I have seen a lot of positive comments on their products.

The Wilson Combat kit also has a trigger return spring, does this correspond to the trigger guard latch spring pictured on page 29?

Is there a benefit to replacing the trigger return spring in addition to the main spring?



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Old October 18th, 2010, 08:53 AM   #2
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gotthegoods, Wilson or Wolf ... it makes no difference. They are both good quality and are made to the same specs ... probably by the same manufacturer. Yes, the trigger return spring is the same as a trigger guard latch spring ... one spring, two functions. The trigger return spring does indeed affect both DA and SA trigger pull. If you go too light, the trigger gets sluggish on return and may not reset properly.
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Old October 19th, 2010, 09:00 AM   #3
 
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"Anyone use a 10# spring and if so, any problems with light primer hits or issues with slower lock time?"

The 10 lb works on my SP and indeed so does the 9 lb with all ammo I have tried. HOWEVER, the gun was tuned (smoothed) by a gunsmith. As to locktime it appears slower (a bit) but I am used to
medium frame S&W's. It appears quicker than a tuned Python I had but they have a huge hammer arc.

"Is there a benefit to replacing the trigger return spring in addition to the main spring?"

Yes, it will also reduce the trigger pull. SOMETIMES the trigger group will need to modified per the Iowegan book on the subject or you may get slow or no reset. Also, even if it works if you do very rapid DA firing it may be unsatifactory (i.e., not reset fast enough). Due to tolerances and such each gun is an individual so the only way to find out is to try the springs.
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Old October 19th, 2010, 11:38 AM   #4
 
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[Is there a benefit to replacing the trigger return spring in addition to the main spring?[/QUOTE]

I put the lighter spring in my SP101 and do not like it. Next time I get the chance I'm returning mine to the factory spring.
I have the 10# hammer spring in and it's fine. I may try the 9# for grins.
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Old October 19th, 2010, 01:09 PM   #5
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Just curious, what did you not like about the trigger return spring?
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Old October 19th, 2010, 03:47 PM   #6
 
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I've gone with the 9 lb hammer spring and have had no failures to fire for the last 850 rounds. Kept the same return spring though. No problems with resetting of the trigger. YMMV
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Old October 19th, 2010, 03:49 PM   #7
 
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Quote:
Originally Posted by MidLife View Post
Just curious, what did you not like about the trigger return spring?
A time or two when I was doing quick follow up shots the trigger didn't return all the way. Yes, it can be said it is my lack of experience not ALLOWING the trigger to return. It just feels too sluggish for my taste.
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Old November 19th, 2010, 06:30 PM   #8
 
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Quote:
Originally Posted by Iowegan View Post
gotthegoods, Wilson or Wolf ... it makes no difference. They are both good quality and are made to the same specs ... probably by the same manufacturer.
+1. Wilson is just 'down the road' a bit from where I live. One of our shooting club members worked for them for a while, and he told me that their springs are, in fact, Wolff springs.

I put them (marked Wilson) in my SP101, and like it a LOT better. Did both the hammer spring and the trigger return spring. No misfires since. Best thing I did for that little gun.
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Old November 25th, 2010, 04:40 PM   #9
 
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I had FTF and timing issues when I used the lightest wolf set in my Sp101 rimfire.
Ended up going back to the factory trigger return spring and mid range hammer return.

FWIW, if the gun will.may ever be used for protection, don't push the envelope on lightness. A misfire in a heated situation when the hammer short strokes could be devastating.
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Old November 25th, 2010, 04:56 PM   #10
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[QUOTE=Wee Hooker;292442
FWIW, if the gun will.may ever be used for protection, don't push the envelope on lightness. A misfire in a heated situation when the hammer short strokes could be devastating.[/QUOTE]

My SP is my go to carry piece so my springs are stock. The DA trigger pull is a little on the heavy side but it is smooth all the way through so it suits my needs. The S/A pull is decently short and easy.
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Old February 7th, 2011, 05:24 PM   #11
 
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I use the 10# spring no problem but it may depend on ammo used. left trigger return spring stock, I want a snappy return
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Old February 28th, 2011, 11:51 AM   #12
 
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I put in the 12# Wolff hammer spring in today, left the trigger return spring stock since I didn't want to fool with it. Polished the hammer strut while I was at it, mad a big difference and the trigger is much easier to pull and very smooth. Can't imagine what it would feel like if I did the full IBOK trigger job. For now I am very satisfied.

With all the extra springs I have leftover from the Wolff Shooters kit I'll probably put them up on ebay :-)
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Old February 28th, 2011, 12:48 PM   #13
 
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Just thought I'd update my prior post since it's been 4 months now.
I now have the stock trigger return spring and the 9# hammer spring in. The gun shoots fine and have not had any failures to fire using
CCI primers. There's not much left to polish on the inside of the gun , it's super smooth!
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Old March 7th, 2011, 07:37 AM   #14
 
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Is it OK to just change the mainspring from the stock 14# to a 12# or 10#, but leave the hammer spring stock?
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Old March 7th, 2011, 08:21 AM   #15
 
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Quote:
Originally Posted by Ruger67 View Post
I put in the 12# Wolff hammer spring in today, left the trigger return spring stock since I didn't want to fool with it. Polished the hammer strut while I was at it, mad a big difference and the trigger is much easier to pull and very smooth.
This sounds like a good option.
-Bruce
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