Magazine feeding issues.

[codybrown]

I recently bought a Christensen barreled action, it's from a mpr model. I picked up a stockys stock with a modified Magpul bottom metal that accepts aics magazines, and a mdt magazine. I couldn't get it to pull a round from the mag about 95% of the time. I dropped a different action in the stock and a 308 mag and it'll pull rounds no problem.

I just got a ag composites stock and put a grayboe m5 bottom metal in it and bolted the action in it figuring that the modified Magpul metal was the issue. I used the same mdt magazine, and it's still not pulling rounds. The bolt will just kiss the case head, but doesn't have enough contact to push the round from the mag. I can push the mag up from the bottom and it'll feed correctly.

I'm new to m5 metal and mags, didn't think I would have this many problems. My 2 thoughts are either the magazine isn't locking in far enough upward, or the action isn't compatible with aics mags. I can't believe that is the case though. The magazine does have a fair amount of play if I grab it and wiggle it if it's locked in. The mpr comes in a chassis and it says it's compatible with aics magazines. My next step was going to be buying a different magazine and trying that.

Anyone have any ideas?

 

[DaveTooley]

It sounds like the feed lips need to be adjusted to allow the case to ride a bit higher. A nose up alignment also helps feeding. The trick is not to go too far allowing the case to pop up prematurely.

 

[Twdmar]

Since the mag can go up further, I would consider peening the end of the magazine release where is sits under the tab on the back of the magazine, so it's a bit longer (or put a spot of weld).
Before you get crazy, you can build up some tape to see if making the mag release longer helps.

 

[ShtrRdy]

Nowadays there are a number of Accuracy International type of mags. Is it possible you have an AW or AX type of magazine? Please post a picture of the magazine you have.

 

[codybrown]

 

[ShtrRdy]

Okay, I'm a bit confused. In the original post you mentioned trying a 308 mag and the picture shows a 223 mag.

I wonder if an MDT adjustable mag catch would fit in your bottom metals?

https://mdttac.com/mdt-adjustable-magazine-latch-acc-premier-gen2/

 

[codybrown]

I dropped a different action and a 308 mag in the stock to rule out a stock issue. The other action is a 6.5x47 hence the larger mag.

 

[DaveTooley]

Might still be a stock issue. From here it appears you need either a longer latch/lever in the bottom metal or inlet the bottom metal deeper into the stock.

 

[codybrown]

It does the same thing with two different stocks. He bottom metal is brand new, the magazine is used, and has the wear in it from the previous owner. My thought was to try a different magazine to see if that changes anything. Putting the 308 magpul magazine into that current bottom metal, the magazine locks in tightly. The MDT 223 magazine has quite a bit of slop in it and I can rock it forward and backward.

 

[DaveTooley]

True, but he's looking for solution. And we don't know if a new magazine would solve his problem.
Larger diameter cases are able to ride higher in the magazine with the locator tab in the same place.

 

[codybrown]

I should also clarify, both the MDT 223 magazine and the Magpul 308 magazine sitting in the same bottom metal, the MDT has a significant amount of play in it.

 

[Larryh128]

I recently bought a Christensen barreled action, it's from a mpr model. I picked up a stockys stock with a modified Magpul bottom metal that accepts aics magazines, and a mdt magazine. I couldn't get it to pull a round from the mag about 95% of the time. I dropped a different action in the stock and a 308 mag and it'll pull rounds no problem.

I just got a ag composites stock and put a grayboe m5 bottom metal in it and bolted the action in it figuring that the modified Magpul metal was the issue. I used the same mdt magazine, and it's still not pulling rounds. The bolt will just kiss the case head, but doesn't have enough contact to push the round from the mag. I can push the mag up from the bottom and it'll feed correctly.

I'm new to m5 metal and mags, didn't think I would have this many problems. My 2 thoughts are either the magazine isn't locking in far enough upward, or the action isn't compatible with aics mags. I can't believe that is the case though. The magazine does have a fair amount of play if I grab it and wiggle it if it's locked in. The mpr comes in a chassis and it says it's compatible with aics magazines. My next step was going to be buying a different magazine and trying that.

Anyone have any ideas?

Normally what will happen is the mag isn't able to engage the mag release if that makes any sense. IS THE MAG locked in when seated or can you pull it out without hitting the release? If you can pull it out the mag release needs to be adjusted to engage the mag. Normally this requires removing material until it locks in.

 

[DaveTooley]

You have 3 options
try a new mag, maybe a different mfg.
longer latch/lever in the bottom metal
or possibly inlet the bottom metal deeper.

 

[codybrown]

Normally what will happen is the mag isn't able to engage the mag release if that makes any sense. IS THE MAG locked in when seated or can you pull it out without hitting the release? If you can pull it out the mag release needs to be adjusted to engage the mag. Normally this requires removing material until it locks in.

The mag locks in solidly. But it has a fair amount of play where you can rock it forward and backward with it latched.

 

[Sniperhandle]

You can see the relationship of the bolt to the mag if the bolt is open all the way, Just slowly push the bolt forward and see how low the bolt is inside of the feed lips. Pillar Height has been one Issue I have had to deal with before, I have had to machine the inlet down just slightly making the dbm sit higher for good feeding.
Dave Tooley has given you all of the solutions, It can only be a few things.

 

[ShtrRdy]

I should also clarify, both the MDT 223 magazine and the Magpul 308 magazine sitting in the same bottom metal, the MDT has a significant amount of play in it.

Oh, okay. So your barreled action is a 223 Rem? If that's the case I've had good experiences with the Accurate Mag in 223. AICS clone. You could try comparing dimensions between your Magpul AICS and your MDT AICS.

 

[Carl S]

I would check the inlet on the bottom metal.ive had that issue a few times.its something that gets overlooked.also as Dave said the mag feed lips may need a tweak.they don't need much to make a difference.

 

[ShtrRdy]

I would check the inlet on the bottom metal.ive had that issue a few times.its something that gets overlooked.also as Dave said the mag feed lips may need a tweak.they don't need much to make a difference.

It looks like the magazine he wants to use is for a 223 Rem. The way magazine manufacturers handle that for an AICS clone mag is they insert a polymer liner onto a regular AICS mag to take up the space not needed for a 223. What that means is the feed lips are a layer of polymer between the steel magazine feed lips and the cartridge.

 

[codybrown]

Correct. I messed around with it more tonight. If I hold light pressure on the bottom of the mag it'll feed reliably. I'm going to try to find one of the adjustable mag catches in stock, if I can't, I'll try a different mag.

Thank you everyone for the help, I'll report back when I have an update.