Model 17-8 light strikes

[Zevana]

Hello,


I recently picked up a used Model 17-8 10 round 22lr. I've found that about 1-2 out of ever 10 shots does not fire. Looks like a light strike to me. The round always goes off on the 2nd go around. I also found that when shooting in SA the reliability is higher an it almost always fires.


I'm using CCI MiniMag ammo. I run the same ammo in several other 22lr firearms and it is nearly flawless.


Any ideas on why this might be happening?

 

[Protocall_Design]

Check to see if the mainspring screw (strain screw) has backed out. This is the main cause of misfires. If tight, it may have been shortened by a previous owner.

 

[toad67]

Is it the same cylinder every time, or does it vary? If the cylinder is dirty, that could be a problem. Possibly an aftermarket hammer spring, too.

 

[s&wchad]

Welcome aboard!

You say they always fire on the second strike. Make sure the chambers/rim recesses are clean and the cartridges are full seated.

 

[stansdds]

Things to look for with a rimfire revolver suffering apparent light strikes:
Debris/dirt/residue/old lubricant under the extractor or in the chamber counterbores.
Excessive end shake or head space.
Firing pin protrusion/length.
Tight strain screw.
Shortened strain screw.
Aftermarket main spring.
Gummy/dirty lock work.

 

[Zevana]

Is it the same cylinder every time, or does it vary? If the cylinder is dirty, that could be a problem. Possibly an aftermarket hammer spring, too.

Not the same one every time. I did give a good cleaning but it didn't help. I'll dig into the spring issue as you and other suggested.

 

[Ameshawki]

Owned a number of double action rimfires from most of the manufacturers over the years. Not sure I've had one that was 100% reliable in double action. Smith is better than most but even they will do it on occasion.