Ruger MkII short cycle solution?

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Otto Mattik

New member
I've about had it up to here with this gun. First it wouldn't extract, so I got one of those Exact Edge extractors and now it extracts just fine.

NOW it has decided to short cycle or something that keeps the bolt from closing into battery so the dang round won't go off.

What next?

I'm at wit's end. Weak spring? Too STRONG spring?

The bolt will only close properly if dropped by pulling back and letting go (which is correct anyway but noted here only for possible diagnosis) Just letting it go eeeeeaaaaassssyyyyy will not work.

The exact model is Mk4B with the SHORT barrel. Could THAT be the reason? Not enough poop from short barrel??

:confused::confused:

roogernbladeqn4.jpg
 
does it do this with all brands of ammo? when was the last time you used bore solvent on it. too many unknowns. need more details
 
ALL brands. I doused it liberally with all sorts of bore cleaner, solvent, and cleaned it METICULOUSLY before trying a PILE of ammo to see if that was the problem.

I...thought... I had it. Remington HS round nose seemed to work FLAWLESSLY.
Until yesterday. After cleaning thoroughly after the AMMO session, I took it out yesterday and got 14 rounds of the Rem off before it failed again.

It also SEEMED to work fine with MiniMags, but I don't want to USE mini mags all the time.

It's a RUGER plain vanilla auto pistol. They are SUPPOSED to work.

I even took out the recoil spring retainer half moon thing and polished off the casting irregularities thinking MAYBE they could be dragging on the receiver.

I'm stumped. Clean gun, various ammo. New Exact Edge extractor.

A real disappointment.
 
I've even run it BONE DRY to test that out.

It's still not even a SINGLE SHOT pistol.

Maybe the ramp. :confused::confused:

But only a GUNSMITH is gonna touch the ramp.
 
Otto: Before you throw it over the hill;), check to see if there is interference at the extractor/extractor slot as the bolt closes. Sometimes the extractor hits either the slot itself or carbon build up in the slot and cause this type of problem.
 
OK, but it doesn't get that far. It stops with a full third of a brass case still sticking out. A sharp smack on the bolt will chamber it.

And SPORADICALLY.

I ...hate.... "sporadically."

:(
 
is there any damage to the lead on a bullet that doesn"t load...problem my be a bent clip lip...
if the bullet comes out of the clip to low it maybe hitting the ramp to low..
these guns are usally very reliable..just my .02 $ worth of hot air
 
If you are using a single magazine, try another or try yours in another pistol. New mags are cheap enough to make buying one or more worthwhile.
 
Sounds like a magazine or feed ramp promblem to me. All three of my MK II'1 feed and function fine. Yours should also. I had a bad mag with my firts MK II. The 2nd mag worked fine so I just bought a few new ones and they also work.

How many rounds through the gun so far? If you ultimately can't get it to run, send it back to Ruger.
 
TWO mags. I tellya. It's MADDENING.

It makes it tougher and tougher the more I do with it. Eliminate EVERYTHING I can think of.

Except the gun. And that's gettin CLOSE.

I have a GREAT old Hi Standard Trophy but THAT one will crack the frame if I use hi speeds.

Seems someone could come up with a dead simple blowback .22

I may get a Buckmark but even THOSE have the loose topstrap issue.

Just a Woodsman or Hi Standard on a HEAT TREATED frame.

Aaaaarrgh..
 
with only 1000 rounds through it I'd call ruger. thats just too strange. never had a problem like that with any ruger mk ive owned.
 
To eliminate the chamber, simply point the barrel at the floor, drop in a live round. It should fall in with no resistance. If it doesn't you need to clean the chamber.

It may be the spring, that is an easy fix, ruger might send you one free.

I would not loose sleep over this, it is probably a simple fix.
 
I happen to be playing with mine (Ruger MK II) tonight, since I just got back from the range.

Reading your post, the chambering problems started after you replaced the extractor, right? I had never had reason to watch the process till now, by chambering a round very slowly, I saw the whole process. The leading edge of the bolt pushes the cartridge forward in the magazine, until it hits the "V-cut" in the magazine lip, when the spring force of the magazine pushes the rim of the cartridge under the lip of the extractor, which then guides the cartridge into the chamber, with the help of the feed ramp. Sounds like your problem the whole time has been related to the extractor, since if I read right you have tried a different magazine and that didn't help, and you had extraction problems from the start. Is this a pistol you bought new? If not, maybe look at getting a new set of standard factory springs and extractor. Does the new extractor allow the cartridge to sit straight as it is fed, or does it cock to one side?


For what it's worth, mine is 20+ years old and I would hate to even estimate the number of rounds through it, all original parts, no problems.
 
Hate to say it, but the problem was WHY I replaced the extractor. It was just the first of my attempts to make this thing run.
The difference was that with the stock extractor, it was not pulling the fired shell out of the chamber and the new one was just jamming against the bottom.

But I can see how maybe it could be.

Because the first extractor may have allowed chambering if the old one HAD come out.

This thing has driven me nuts.

And the Hi-Viz sight didn't even correct it.....:D

The extractor SEEMS to fit. It goes into battery EMPTY just fine. I can let the bolt go as sloooooowwwww as possible and it still closes fine.

EMPTY.

Also.... when dropping a round into a down pointed chamber it just goes ker-plunk..... no resistance at all.

Thinkin out loud the old extractor DID pull the empties PART WAY out as the new round always jammed against the SIDE of the partially extracted (or just blown back) empty case.
 
A couple of comments.

First, H-S has used the name "Trophy" on two or three different pistols, but the earliest was made in 1958. So your Trophy should work just fine with high speed ammo and you won't crack the frame (or anything else) by using it.

Second, when a blowback pistol like that Ruger is fired, the extractor doesn't pull anything out of the chamber. The internal pressure PUSHES the cartridge out of the chamber and pushes the bolt back; the extractor only serves as a pivot point for the ejector and, of course, allows the shooter to remove an unfired round.

Jim
 
"Second, when a blowback pistol like that Ruger is fired, the extractor doesn't pull anything out of the chamber. The internal pressure PUSHES the cartridge out of the chamber and pushes the bolt back; the extractor only serves as a pivot point for the ejector and, of course, allows the shooter to remove an unfired round."

Good point, Jim. It's a pity Otto didn't know that.

From Otto himself: it seems to work fine with Minimags.

From myself - I have exactly the same Ruger, 4" barrel. Initially, it did have sporadic ejection problem, sometimes, with standard velocity ammo. And it did shoot fine with high velocity ammo. Guess what - knowing a bit about basics of blowback operation, I managed to apply simple logic - damn recoil spring, same spring as the one used in 6 7/8" Government model I also got (works just fine with any ammo) is a bit too strong to get fully compressed
in case of 4" barrel. Ruger uses the same recoil spring for both 4 and 6 7/8
barrel models! Naturally, I took wirecutters and cut a couple of coils off.

No more problems.
 
Damn! I was JUST about to try that too.

Theorizing that the 4" bbl PLUS being a BULL BARREL could reduce the recoil force and do exactly what you said.

The MiniMags, though, did not work "satisfactorily".....just better. Still another tipoff, though. Strangely, it worked FAIRLY well with Std Vel CCI blue label that I use for most shooting.

Oh, and that High Standard. They DO crack frames. I believe it is the Hamden models that are affected, but I can't find the old High Standard forum.

This one confirms, though.
http://disc.yourwebapps.com/discussion.cgi?id=226190;article=8473;search_term=frame+crack
 
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