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RUGER Mark III Feed Ramp Jams

This is a discussion on RUGER Mark III Feed Ramp Jams within the Ruger Rimfires forums, part of the Pistol & Revolver Forum category; About a month ago, I finally gave in to a long time dream and bought myself a RUGER Mark III Hunter. I have always associated ...


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Old December 31st, 2008, 12:36 AM   #1
 
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RUGER Mark III Feed Ramp Jams

About a month ago, I finally gave in to a long time dream and bought myself a RUGER Mark III Hunter. I have always associated the name RUGER with quality, however this time they seem to have a flaw in the design. Whenever I use any hollow point or any solid point 22LR with a flat nose, I get frequent Feed Ramp Jams where the sharp lower edge of the Feed Ramp cuts into the nose of the bullet just below the hollow point hole. I even have had it happen on a few occasions to a round nose, but that is rare. It appears to me that if they had designed the Feed Ramp to come down 1/8th inch more, NONE of these Feed Ramp Jams would be happening.

As anyone familiar with using a Rimfire weapon with a magazine knows, there is quite a bit of play in nose of the bullet about to be fed into the chamber. Therefore, I think it is the rounds that are hanging low that catch the flat nose area surrounding the hollow point hole, thus if RUGER would redesign Mark III Feed Ramp to come down 1/8th inch more, that should solve the problem. Am I correct?

NOW the problem is we are stuck with weapons prone to frequent Feed Ramp Jams, which is VERY frustrating. I am only going to buy round nose bullets from now on to minimize the problem. My question however, is there anything I can do to the Feed Ramp or Magazine that would reduce the likelihood of these Feed Ramp Jams from happening? Would taking a fine miniture file (such as one of these: http://www.garrettwade.com/product.a...cd2=1230711049 ), and slightly rounding that sharp bottom edge of the Feed Ramp improve the likelihood of a low hanging round sliding up onto the Ramp instead of jamming?

How about you Iowegan? Since you are a retired gunsmith, do you know how we might fix the Feed Ramp Jam problems that most of us MARK III users are experiencing?



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Old December 31st, 2008, 08:08 AM   #2
 
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I've no feeding problems with various ammo, HP or not, in my Mark III.
Your troubles could be from magazine issues. Click this; it's in reference to a Mark II, but the info regarding the magazines may be relevant to your issues. As suggested in that post, I did the quick filing on my magazines before even shooting my Mark III for the first time, so it may have helped - but I'll never know. Good luck.
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Old December 31st, 2008, 09:18 AM   #3
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VCO67, First of all, it's not a design issue. Ruger has been using the same feed ramp design on their MK series barrels since 1949 with a reputation of being "garbage eaters", meaning they will reliably feed just about all ammo.

When a MK series pistol is working right, as the cartridge is stripped from the magazine, the nose of the bullet should be pointing slightly up. The base (rim) of the cartridge has to slide up against the breach face until it is positioned in the "pocket" of the bolt. The nose should contact the feed ramp about in the middle then guide into the chamber. There are two known issues that prevent the nose from pointing up and in fact make the nose point down.

The first possibility is the bolt's breach face. If it is rough or has any obstructions, the base of the cartridge won't slide into position and will force the bullet nose down. This is not a common problem but it does show up now and then.

The next and most likely problem is the feed lips on the magazine. These are "stamped" parts and often have razor sharp edges under the lip that bite into the rim of the cartridge. Again, this will cause the nose to point down instead of up and will force the nose to strike the bottom of the feed ramp. The fix is easy ... take the magazine apart so you can access the lips better and so you can clean up the "crumbs" afterwards. Use a file to dress the sharp bottom edge of the lips so they are more rounded. jeepincalifornia's link has a good picture and procedure for dressing the lips.

When I bought my MK III, the two magazines that came with it work pretty good but I bought another new spare and it was terrible. After dressing the "lips", it worked just fine. I have since smoothed up the lips on my other two magazines so all of them now feed flawless with any ammo.
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Old December 31st, 2008, 09:53 AM   #4
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VCO67,

I have had my MKIII 22/45 for about the same amount of time. I got tons of great information off of this forum but here's the advice that led me to many hours of near flawless shooting.

It's too late now but I cleaned my gun before firing it and, as advised, disassembled and thoroughly cleaned my magazines just the one time so far.

I use ONLY high velocity rounds since sub-sonic and some standard velocity rounds cycle the bolt more slowly and have led to jams in my friends' Rugers (MKII and MKIII versions).

Lastly, just prior to inserting the magazine, make sure the first round sits proud (nose high) as this ensures the first round will chamber properly.

Oh yeah, try to use the better ammo. I have found the Wal-Mart Federal 550 bulk 36 grain HP rounds to be just fine, inexpensive and fairly clean firing cartridges.

I hope that helps!
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Old January 3rd, 2009, 03:02 AM   #5
 
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Good Advise!

Thanks everyone for the info! Yes, I followed the advise and filed on the magazines. It seems to have worked! I got a brick of Federal 550 copper plated hollow points at WalMart and after firing a 170 of them; NO FEED RAMP JAMS and the Federals seems to work extremely well in my Mark III (No duds, No squibs, and only one empty shell stovepiped). I still have half a brick of those Golden bullets to use up, but I will not be buying anymore of them. I appear to have filed too much on the first magazine, as I see a round hanging too high in it occassionally when I snap the clip in. I filed less on the second magazine and it works better.
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Old January 3rd, 2009, 08:21 AM   #6
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VCO67, On the magazine where you filed too much ... use a pliers and bend the top lip in just a little. Use your good magazine for a reference for the angle you want.
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Old January 8th, 2009, 01:13 AM   #7
 
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Best pictures of how to round corners off the magazines.

This is the best pictures of how to round those corners on the magazines, which was posted on another thread (ref. the mentioned site: http://xavierthoughts.blogspot.com/2...ine-tweak.html ). That is how I rounded the second two mags and they work nearly perfect. As I stated above I rounded the first one too much towards the back of that point, which allowed the round to pop the nose of the round up too much. Thanks everyone for the tips. . When I emailed RUGER (before finding this forum), all they said was that I would have to ship the weapon back to them for possible repairs. You'd think they would share these kind of tips before they would resort to "ship it back".

NOW WHERE DID THAT BLOG GO? It appears to have been removed.

OKAY, I took a photo of mine, to solve that problem, just click the picture to see it enlarged:


Last edited by VCO67; March 9th, 2009 at 06:59 PM.
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Old January 10th, 2009, 07:15 AM   #8
 
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It's OK if the blog is missing, Xavier got the idea for it from this web page http://www.1bad69.com/ruger/stovepipe.htm

Here's the magazine feed lip mod in its original posting.

R,
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Old January 29th, 2013, 12:13 PM   #9
 
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My MII was stove piping all the time. Bought it used and only fired it a couple times. Was thinking about selling it because of this problem. Found this thread. And now no more problems. Took all of about 5 minutes to do on both much mags. Just put 100 rounds thru it. Not one stove pipe. Thanks.
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Old January 29th, 2013, 05:30 PM   #10
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Guess I'm lucky. Have a 2008 production Mark III Target, and five extra mags bought soon after, for a total of seven. Only the "extras" have the solid black eagle base, the two that came with the gun have the red and silver eagle.

Anyhow, I have good performance with stock mags. It will eat Federal bulk, etc. with only a rare FTE, usually when it it is getting pretty dirty. My total mods are the VQ kit and hammer bushing, with a LCI plug.
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