Mark II
Moderators: Bullseye, Moderators
Mark II
Ocassionally, after firing the gun goes into battery and the trigger trips and no shot. I pull the bolt back and the fired case ejects and a new round loads into the chamber, I fire it as if OK. Do you know what's wrong?
NRA Endowment Member
Yes, they don't eject sometimes but the gun seems to cycle and the trigger trips. All I do is pull the bolt back which then ejects the shell and loads the next bullet to fire. Thanks for your consideration of this matter.Bullseye wrote:Jack,
I'm not sure I fully understand the circumstances of your failures. Are the spent (fired) cases not ejecting from the chamber?
R,
Bullseye
NRA Endowment Member
John,
Based on your description it sounds like a weak or worn extractor combined with a dirty or damaged chamber. If a new round is not being stripped off the magazine lips and jamming against the unejected case, then the bolt is not cycling fully rearward but is cycling just far enough to recock the hammer.
Inspect the chamber for any lead build up or gritty residue. Use a wire bore brush and scrub the chamber area in a circular motion with cleaning solvent applied to a patch. Wrap the solvent soaked patch around the brush and insert it into the chamber just far enough to not touch the barrel's grooves. Dip the clean patch into your solvent bottle - do not dip the bronze brush into the bottle or you will contaminate the solvent with the brush and reduce its effectiveness. Rotate the cleaning rod in a clockwise direction several times and remove the brush from the rear of the chamber - do not push the brush and patch down the barrel to the muzzle end of the barrel. Also inspect the top of the chamber for any firing pin dents which will make the chamber mouth opening out of round.
Remove the bolt and inspect the extractor hook for wear.
The hook should have nice clean sharp edges and move freely in the extractor slot. Next inspect the extractor recess in the receiver for any build up. This is the hole on the right side of the breech face where the extractor sits when the bolt is closed. Any build up of grit or lead will cause the extractor to sit back off of the rim of the cartridge and prevent the hook from getting a good grip to hold the case against the bolt face during the extraction cycle. If your extractor is worn consider getting a VQ Exact Edge Extractor from Rimfire Sports and Custom.
Hope this helps.
R,
Bullseye
Based on your description it sounds like a weak or worn extractor combined with a dirty or damaged chamber. If a new round is not being stripped off the magazine lips and jamming against the unejected case, then the bolt is not cycling fully rearward but is cycling just far enough to recock the hammer.
Inspect the chamber for any lead build up or gritty residue. Use a wire bore brush and scrub the chamber area in a circular motion with cleaning solvent applied to a patch. Wrap the solvent soaked patch around the brush and insert it into the chamber just far enough to not touch the barrel's grooves. Dip the clean patch into your solvent bottle - do not dip the bronze brush into the bottle or you will contaminate the solvent with the brush and reduce its effectiveness. Rotate the cleaning rod in a clockwise direction several times and remove the brush from the rear of the chamber - do not push the brush and patch down the barrel to the muzzle end of the barrel. Also inspect the top of the chamber for any firing pin dents which will make the chamber mouth opening out of round.
Remove the bolt and inspect the extractor hook for wear.
The hook should have nice clean sharp edges and move freely in the extractor slot. Next inspect the extractor recess in the receiver for any build up. This is the hole on the right side of the breech face where the extractor sits when the bolt is closed. Any build up of grit or lead will cause the extractor to sit back off of the rim of the cartridge and prevent the hook from getting a good grip to hold the case against the bolt face during the extraction cycle. If your extractor is worn consider getting a VQ Exact Edge Extractor from Rimfire Sports and Custom.
Hope this helps.
R,
Bullseye
Gave rhe gun a proper cleaning. Extractor seems sharp. Hole where it sits has no gunk in it. Chamber seems OK but I cleaned it as you advised. Will test it out asap. Have range duties this weekend so this may be delayed. Will let you know what happens. May try high velocity ammo also.
NRA Endowment Member
Mark II
Got a chance this afternoon to test after my cleaning. Shot 30 rounds of the same ammo I had a problem with and there were no bobbles! I believe the cleaning of the chamber with a larger brush did the trick. I didn't have a chamber brush so I used a larger brush just for the chamber. I'm ecstatic!!! I'm a Ruger nut and am grateful for your help. Thanks again.Bullseye wrote:I look forward to hearing the testing results.
R,
Bullseye
NRA Endowment Member
Bullseye wrote:That's great news John. I recommend you get a .22 cal brass cleaning (bore) bursh for periodically cleaning the chamber.
R,
Bullseye
Are you sure you mean a bore brush rather than a chamber brush? I use the bore brush when I clean the gun but the chamber apparently needs something larger like a chamber brush. This was the first time I had a problem like this in 32 years. I actually bought a 6 MM brush cause I couldn't find a bore brush for the 22.
NRA Endowment Member
A bore brush will work just fine. Get a .22 caliber one like this. Brownells has them in .22 cal. Bore Brush
They're big enough to scrub the chamber just fine. Stick the brush in through the breech end and into the chamber, just rotate it clockwise several times without pushing in too far. Keep the brush out of the pistol's bore, just use it to scrub the chamber and retract it back through the breech. All you want to do is give the chamber a good scrubbing with the brush.
R,
Bullseye
They're big enough to scrub the chamber just fine. Stick the brush in through the breech end and into the chamber, just rotate it clockwise several times without pushing in too far. Keep the brush out of the pistol's bore, just use it to scrub the chamber and retract it back through the breech. All you want to do is give the chamber a good scrubbing with the brush.
R,
Bullseye