986 Light strikes and endshake?

[TAROMAN]

My 986 has developed the dreaded light strike syndrome.
Steel challenge gun. About 2K 135g light loads through it.
Going to check everything. Endshake first.
I measure .007" max to .002" minimum.
Can't find a published specification for this.
Maybe add one shim?
Any thoughts appreciated.
Thanks.

 

[AzShooter]

Check your firing pin. Make sure the FP channel is clean. Check your strain screw, make sure it's tight.

A shim won't hurt. Give it a try.

 

[ruger 22]

I am getting mine back from S&W next week. Took about 8 weeks. Same issue. The strain screw was loose but tightening did not help. The ammo was Armscor. My suspicion was a broken firing pin spring. Will let you know what they found.

 

[TAROMAN]

Strain screw is tight. First suspect.
My handloads always have Federal primers, too.
Time for a deep dive.

 

[Protocall_Design]

Sounds like .005 worth of endshake. You want that down around .001. Check for broken firing pin and/or fp spring.

 

[stansdds]

I think the 0.005" end shake might be the issue.

 

[TAROMAN]

Gun is back together.
.004" shim installed.
OEM firing pin and spring were OK
I did install the Apex pin. Noticed it's lighter than stock.
Replaced strain screw with a 1/2" socket screw, blue locktite.
No snapcaps, so I made a set. Letting RTV cure now.

 

[TAROMAN]

Update, test fire session went fine. All DA.
Amazingly, I managed to get the new strain screw tension right on.
Blue locktite on it. Added paint witness marks to spot any movement.

 

[ruger 22]

Got my 986 back. It gave light strikes at times. They replaced the firing pin and spring.