So I changed out the trigger return spring and the hammer spring in my .22 caliber SP101. I get consistent ignition in double action and absolutely no ignition in single action. I've tried various types of ammo with the same results. Would this be the trigger return spring? Should I change it back to the original?
Ruger SP101 .22 spring issue
- Thread starter J-kid
- Start date
Captain America
Hunter
Only the hammer spring affects the primer strike, what pound hammer spring did you use, is it an newer 8 shot model? Oh, welcome to the forum!
I have the 14 pound hammer spring and 8 pound trigger return spring installed. I first put an even lighter hammer spring in but moved to the 14 but still have the same issue. Yes, it's the 8 shot model. I have three SP 101’s and a GP 100 so the heavy trigger pull left me wanting.
Captain America
Hunter
Yea the 22 will loosen up, polishing helps, I only have the lighter trigger return spring in mine so the wife can cock it easily. Are you getting light strikes in SA or no strike at all. If you are striking the case I would put the original spring in and see if the problem corrects itself. If you're not striking the case you'll need to do a little detective work. Did you order the springs for a 2011 and newer SP101 .22 lr?
Captain America
Hunter
That is odd, I would still see if the stock hammer spring(16 pounds) solves the problem, make sure that the hammer strut isn't hanging up on the spring or hammer and that the transfer bar and hammer aren't rubbing on the frame.
Seems odd, usually it's the other way around. For the single action sear to engage requires
the hammer to be back slightly past where the double action sear releases the hammer.
So you normally have more energy on single action....weird.
Is the transfer bar covering the firing pin when the hammer is cocked?
Main spring somehow binding at full compression when manually cocked for
single action?
Dave
the hammer to be back slightly past where the double action sear releases the hammer.
So you normally have more energy on single action....weird.
Is the transfer bar covering the firing pin when the hammer is cocked?
Main spring somehow binding at full compression when manually cocked for
single action?
Dave
The transfer bar is in the same location (covering the firing pin) on both single and double action when the hammer is back. Maybe there is a burr on the hammer strut. That's all I can think of that would cause the problem. I'll give it a good work over. Take off all burrs and polish the working parts and try it one more time. If I don't have any luck I'll replace both original springs and start making changes one at a time to see when the problem arises. I just thought maybe someone else had experienced the problem. It sure does seem out of the ordinary.
Captain America
Hunter
I would leave the trigger return spring in and just make sure the spring plunger bore is smooth, and the pawl plunger and spring plus the trigger plunger work smoothly. My SP in .22 is pleasant to shoot with the lighter return spring and I have no ignition problems because of the stock hammer spring. When you find the issue be sure to report back in case someone else has this problem. I have several hammer springs for mine and will do some testing to see what I come up with.
It is an odd problem to say the least. I actually did a basic de-burr and polish of all the internals. I wonder if I missed something? I'll go back in and do a more thorough job and leave the springs as they are and see what happens. Once I'm sure it is not a function issue I'll start manipulating springs. I will report back with my findings. Thanks for you suggestions.
JosWerring
Bearcat
I also chanced the springs for Wolf springs and they function well. But the SP101 is not one of the best Rugers, the barrel has olso his problems. It's my second, becuase the first one making keyholes even after repairing by the dealer Fa. Noordgouwe
Rimfire ammunition requires a good solid smack for reliable ignition.
Hammer spring/hammer force that works fine in centerfire does not equate directly to rimfire in the SP.
Sometimes users have gotten away with swapping rimfire springs, sometimes not.
It's the nature of the beast.
My 4.2 .22 SP has all stock springs & no ignition issues.
I see no point in messing with what works there, beyond a little judicious internal action honing.
Denis
Hammer spring/hammer force that works fine in centerfire does not equate directly to rimfire in the SP.
Sometimes users have gotten away with swapping rimfire springs, sometimes not.
It's the nature of the beast.
My 4.2 .22 SP has all stock springs & no ignition issues.
I see no point in messing with what works there, beyond a little judicious internal action honing.
Denis
