Mark III dry cleaning solvent?/Sticking Trigger?

[FredW]

Hi,

I am enjoying my new Mark III but have an intermittent problem with the trigger sticking in the aft position. The first two hundred rounds it stuck about 4 times. I gave it a quick cleaning with the bore snake and a little light oil. The second hundred rounds it only stuck aft once, so it is improving. I went to Rugers video on Mark III disassembly and did a thorough disassembly, cleaning and light lubrication. I haven't had a chance to see if the problem is corrected yet or not. Has anyone else had this problem?

In the video Ruger talked about using a dry cleaning solvent. Any recommendations on what is best for the Mark III?

As always thanks in advance for all the good advice!

Fred

 

[Bullseye57]

Sometimes the trigger plunger hole can get clogged with powder residue and cause the symptoms you've described. The plunger is responsible for returning the trigger to the forward position. It is also on top of the trigger and exposed to lots of powder blowback. You have two options to clean up that plunger hole, polish it or widen it.

Polishing involves a little sandpaper and a drill bit shank. I have used that style of fix many times on trigger plunger holes. I usually use a twist drill shank with a little #600 grit sandpaper wrapped around it to polish the inside of the plunger hole.

To widen the plunger hole is easy since the hole is just a captive orifice for the plunger, opening it up a little is a great way to smooth up a trigger pull. This is the place where most of the powder residue tends to gather, and a tight tolerance between the plunger and the trigger body will quickly make for a gritty trigger pull feel. I've even gone as far as opening up the hole to the next higher drill body size, a #9 (0.196") twist drill works well for this task. Just be extra careful to only open up the hole and not make it any deeper. Creating a deeper plunger hole will affect the plunger's ability to lift the disconnector and cause misfires due to the trigger's inability to engage the sear.

Hope this helps.

R,
Bullseye

 

[FredW]

Hi,

Thanks for the quick and detailed response. I very much appreciate your input and will look for to putting the fix on my gun!

Fred

 

[TiteGroups]

You can also fashion a shield for it from some thin shim stock, if you look around on the rimfirecentral site there's info on it.

 

[Mobuck]

With so many dedicated gun cleaning/lubing products, I don't see the need for some oddball cleaning solvent which might be harmful to the finish.
It's a new pistol and may have some burs. If the problem comes back, do another stripdown and address the specific area noted with some GunScrubber or similar product and re-assemble. If it is a bur or milling debris, it will work itself out.

 

[rugerguy]

we've found and had good results with simply using 'kroil',,,,,,,,,,,,,solvents that dry out ,will NOT "lube" any of the surfaces, causing more drag, and issues.....cleanliness and lightly oil, .22 rimfires are VERY ,very dirty and fouling............ 8) :roll: :wink: