MagPul Magazine Problem in KRG Chassis

[Longshot231]

I have two Remington 700 rifles in the KRG Whiskey 3 chassis. Everything works great except for one problem with both the 5 and 10 round Magpul magazines.

Both magazines function flawlessly in the rifle unless I'm in a prone position with something (dirt, rock or barricade) pushing on the bottom of the magazine. The same problem manifests itself if I attempt an offhand shot with the magazine resting on my support hand, like when I shot offhand with an M1A.

With either my hand or something else pushing up on the magazine, I am able to pull the bolt back after the shot but not chamber the next round. The bolt face runs into the back of the magazine since it is now pushed up farther into the magazine well. Only when I relieve the pressure from the bottom of the magazine am I able to chamber the next round.

This problem does not exist with the KRG steel magazines.

Does anyone have any suggestions on how to fix this problem?

 

[spife7980]

Quit pushing on the magazine.

 

[Longshot231]

Quit pushing on the magazine.

I thought about that but the perfectionist in me wants to fix the problem. I like the KRG magazines but don't like the price tag. So I feel like being cheap and stubborn and want to fix the problem.

 

[wade2big]

I have two Remington 700 rifles in the KRG Whiskey 3 chassis. Everything works great except for one problem with both the 5 and 10 round Magpul magazines.

Both magazines function flawlessly in the rifle unless I'm in a prone position with something (dirt, rock or barricade) pushing on the bottom of the magazine. The same problem manifests itself if I attempt an offhand shot with the magazine resting on my support hand, like when I shot offhand with an M1A.

With either my hand or something else pushing up on the magazine, I am able to pull the bolt back after the shot but not chamber the next round. The bolt face runs into the back of the magazine since it is now pushed up farther into the magazine well. Only when I relieve the pressure from the bottom of the magazine am I able to chamber the next round.

This problem does not exist with the KRG steel magazines.

Does anyone have any suggestions on how to fix this problem?

There is no fix other than getting rid of the magpul magazines. They will not work with the 700 action. You can not file enough of the feedlips to make the magazine function. Don’t let anyone try to tell you differently. Ai, accurate mags, and apparently krg steel mags will not do this. You can stand on the rifle and still cycle the bolt.

 

[wade2big]

Ignore the “don’t push on the magazines” guys either. If a mag won’t function with anything touching it then the mag doesn’t function.

 

[scocoabeach]

Is it a Gen 6 stock? Have you tried these steps on page 3 of the manual?

Magazine Fit Adjustment
Requires hex wrench (Allen wrench)
Step 1:
Loosen the M5 screws that hold forend onto
chassis with 3mm hex wrench. Tikka versions have 6 screws,
Remington 700 versions have 8 screws. These screws have
blue Loctite so they may be difficult to loosen.
Step 2:
Slide the forend forward or backward a small
amount to achieve the desired fit of the magazine into the
stock. Re-tighten screws from step 1.
Step 3:
If unable to achieve desired fit, trigger guard can
be moved forward and backward a small amount as well.
Remove action from stock, loosen screw holding trigger
guard to stock, reposition trigger guard, re-tighten screw

 

[Longshot231]

I tried the fix but it did not work. I may just have to bite the bullet and buy a few more KRG magazines.

Or I might try the MPS fix with this product to see if I can get it to work in the KRG chassis:
https://masterpiecearms.com/shop/mag-block-insert/

The videos on that page are a little hard to watch so here's the YouTube links:





The Magpul magazines aren't going to go to waste as I am considering getting an MPA rifle in 6.5CM.

 

[Thunderhorse]

Yeah the Magpul mags don't work at all with Tikkas in a KRG chassis, but I hadn't heard of issues with them in the Remingtons. I don't have a high opinion of the Magpul AICS mags-they are varied too far from the actual AICS pattern which is why these issues exist. You just can't really replicate them in a poly mag without molding in steel pieces like in an AK magazine. Then again, Magpul was also reluctant to put steel reinforcements in their AK mags where they are critical for the lugs-the design doesn't relieve stress from those areas like an AR mag.

I'll shoot their STANAG-4179 pattern mags all day long, but I like Accurate Mag for AICS. Magpul makes good stuff, but IMHO there are some things they don't do best. I bet a Remington 700 in a Pro 700 chassis has no problem with their AICS mags, but I'd not buy magazines of what is considered a standard pattern that only work in one chassis. The whole point of AICS mags is you can have one type of mag adaptable to a bunch of different rifles/stocks/chassis/actions.

I know "buy steel mags" isn't the most helpful answer, but what's the difference in cost, like $20/mag? That's probably how much Magpuls would cost if they molded in thinner steel lips. Maybe I don't have a lot of magazines.

 

[Longshot231]

I looked at a few MPA rifles. I shouldered them with the support hand under the MagPul magazine. Now, obviously, there were no rounds in the magazine in the gun store but I cycled the bolt several times and didn't have any problems.

When I look at the back of the magazine well in the KRG chassis, it appears to me made the same way as the MPA chassis. That's why I'm wondering if the MPA mag block insert would work in the KRG chassis.

Heck if I could find some delrin, I might try to fashion a mag block insert myself. However, I can't find any delrin that I can get my hands on locally. So, if I had to buy it, I might as well get the MPA mag block insert.

Any other ideas would be greatly appreciated.

 

[SuperSneakySniper]

Sorry to bring an oldish thread back but is this problem strictly the magazine's fault? Ive had this issue with the Magpul Pro chassis, but not the MPA chassis, using steel mags and the same actions.
Im curious because I want a Lone Peak/KRG build and dont want to run into this issue again if possible. Has anyone ever had issues like this with Steel mags or a certain action?

 

[wade2big]

If steel mags can be overinserted in your action, bend the feedlips to fit. The chassis or stock has nothing to do with the bolt binding issue. Its mag/action related.

 

[SuperSneakySniper]

If steel mags can be overinserted in your action, bend the feedlips to fit. The chassis or stock has nothing to do with the bolt binding issue. Its mag/action related.

Well that's the weird thing, for some reason my Impact action and Accurate Mags work flawlessly in MPA chassis, but once I plopped it into a Magpul Pro chassis, the bolt wouldn't go forward when I put pressure on the mag. Same exact action and mag. I modified the feed lips and it works fine now, but I was just curious as to how I could avoid having to do that in the future. Maybe modifying feed lips is a normality for the hobby? It's the first time I've had to do it.

 

[wade2big]

That is weird as I haven't seen a stock or chassis that has anything to limit upward travel of the magazine. Did you by any chance just not notice it in the MPA chassis? I haven't had to modify metal magazines (AI or Accurate) on any of my actions but I do know some people have to.

 

[SuperSneakySniper]

That is weird as I haven't seen a stock or chassis that has anything to limit upward travel of the magazine. Did you by any chance just not notice it in the MPA chassis? I haven't had to modify metal magazines (AI or Accurate) on any of my actions but I do know some people have to.

Yup, I tested both chassis by resting the gun on the magazine and cycling the bolt, MPA worked, Magpul was a no-go. I only tested using a stock Accurate Mag (SA .308). Didn't have any polymer mags.

I'm glad I was able to modify the magazine to work properly in the Magpul, but I worked on it like a barbarian with a bench vise and steel file, and I doubt it's as positive as an unaltered factory mag would be. Basically I just got it to hold the rounds, and they stay when I give the mag a few upside-down slaps, but in my mind, it doesn't feel as secure lol. So I'm doing research on how to build a rifle that doesn't need special magazine attention.

 

[Longshot231]

I saw this on the MPA website and got one myself. I haven't needed to use it but it looks very well made.
https://masterpiecearms.com/shop/mpa-mag-feed-lip-adjustment-tool/

 

[wade2big]

Is there an

Yup, I tested both chassis by resting the gun on the magazine and cycling the bolt, MPA worked, Magpul was a no-go. I only tested using a stock Accurate Mag (SA .308). Didn't have any polymer mags.

I'm glad I was able to modify the magazine to work properly in the Magpul, but I worked on it like a barbarian with a bench vise and steel file, and I doubt it's as positive as an unaltered factory mag would be. Basically I just got it to hold the rounds, and they stay when I give the mag a few upside-down slaps, but in my mind, it doesn't feel as secure lol. So I'm doing research on how to build a rifle that doesn't need special magazine attention.

Is there a stop in the mpa magazine well?

 

[SuperSneakySniper]

Is there an

Is there a stop in the mpa magazine well?

Im not sure but I think ill ask em. Unfortunately the MPA chassis is not with me.

 

[Jthom091]

I have also had this problem in the past

 

[Stoweit]

I had an MPA, with Curtis action and it would not cycle with MP magazine with pressure on the bottom of magazine. No pressure it worked great.

 

[aljones_315]

I thought about that but the perfectionist in me wants to fix the problem. I like the KRG magazines but don't like the price tag. So I feel like being cheap and stubborn and want to fix the problem.

sounds very similar to the mpa chassis issue all though it was not unique to magpul mags watch a you tube video in reference to the mpa chassis mag rock issue and then try to relate those moving parts to your chassis it may atleast help you pin poing the flaws and see if its more a chassis fix or if you can do something to the mags them selves

 

[aljones_315]

I had an MPA, with Curtis action and it would not cycle with MP magazine with pressure on the bottom of magazine. No pressure it worked great.

mpa now sells a $10 fix it kit for that mag rock issue

 

[wade2big]

Trust me it’s a magpul magazine problem with a lot of actions. If they work then use them as they feed smooth. They just don’t work reliably with many actions.

 

[Txmxracer]

I have found that the Magpul mags work fine in my MPA chassis but not in my KRG Bravo. Its a shame because it would be nice to use the same mags in everything.

 

[SierraCJ5]

I have found that the Magpul mags work fine in my MPA chassis but not in my KRG Bravo. Its a shame because it would be nice to use the same mags in everything.

Magpul mags work great in my KRG Bravo

 

[wade2big]

Magpul mags work great in my KRG Bravo

Which action?

 

[Stoweit]

mpa now sells a $10 fix it kit for that mag rock issue

Will that fit in a Magpul 700 Pro chassis ?

 

[atomic41]

Magpul mags have worked flawlessly for me in a R700/Bravo, and a Nucleus/Bravo.

 

[wade2big]

Magpul mags have worked flawlessly for me in a R700/Bravo, and a Nucleus/Bravo.

Until you press against then or set the rifle weight on them. At least with the rem 700.

 

[SierraCJ5]

Which action?

Nucleus

 

[EXTREMEPREJUDICE]

There is no fix other than getting rid of the magpul magazines.

Yeah, I hate to say it but for me they are/were a mishit.

 

[wade2big]

Nucleus

Good to know that they work with a Nucleus action. They also work in a Curtis Axiom with a few swipes of a file to the feedlips. Complete no go on a 700. There was also a older thread where they are a no go on the newest Curtis action with the integral recoil lug.

 

[308pirate]

Everyone send me all those defective Magpul magazines. I'll take em all.

 

[aljones_315]

Will that fit in a Magpul 700 Pro chassis ?

that it cant say as i font have a magpul pro but the fix mpa came up with is a smal shim that takes up the extra space behind the mag latch on the chassis now when pressure is applied to the mag there is no where for it to rock into the void is filled and the rifle feeds just like there is no pressure on the mag at all

 

[Stoweit]

Thanks aljones

 

[Longshot231]

I don't know if this will fix my problem with the KRG / Magpul magazine issue but I placed an order for two of them.



Here is the link to the mag block.

https://shop.shortactioncustoms.com/

 

[Longshot231]

I tried the Short Action Custom mag block for the KRG chassis.

It was good for what the video showed but unfortunately, it didn't prevent the bolt from stopping against the back of a MagPul magazine when I pushed up on the bottom of the magazine.

On the other hand, I don't regret purchasing the mag block. It's good for keeping the forward stock screw from falling out. That's good for easier disassembly and reassembly of the rifle.

It also makes inserting both the KRG and MagPul magazines a little smoother.

I need to find some scrap aluminum or delrin to fashion into a block that I can put into the slot above the magazine catch. This is the approach that MPA uses with their magazine block.

 

[stilesg57]

Any word about how the Magpul AICS mags worth with a Howa action? And in which chassis(s)?

As someone who loves other Magpul mags for ARs and Glocks I was planning on getting Magpul AICS mags for my first long range build. This thread makes me nervous.

 

[Stoweit]

Stick with steel mags for bolt action. Had to sand feed lips with a Curtis action. AICS and Accurate Mags are no problem.

 

[Shifty6BR]

Same thing with my 591 in a t4a. I started to work down the feed lips but after seeing that I would have to remove quite a bit of material I decided fuggit and quit caring. I would have to force the mag up a bit to induce the blockage like resting the 17lb + rifle on it or jamming it up by hand, which neither I do not do.

Ai branded metal mags no problem whatsoever. Still use the magpul tho, such is life I guess.

 

[SonicBurlap]

I tried the Short Action Custom mag block for the KRG chassis.

It was good for what the video showed but unfortunately, it didn't prevent the bolt from stopping against the back of a MagPul magazine when I pushed up on the bottom of the magazine.

On the other hand, I don't regret purchasing the mag block. It's good for keeping the forward stock screw from falling out. That's good for easier disassembly and reassembly of the rifle.

It also makes inserting both the KRG and MagPul magazines a little smoother.

I need to find some scrap aluminum or delrin to fashion into a block that I can put into the slot above the magazine catch. This is the approach that MPA uses with their magazine block.

Which KRG chassis did you try the SAC KRG mag block in the Whiskey-3, the X=Ray, or the Bravo, or will it work in all of them?

 

[Longshot231]

Which KRG chassis did you try the SAC KRG mag block in the Whiskey-3, the X=Ray, or the Bravo, or will it work in all of them?

I installed the block on both rifles which have the Whiskey-3 chassis.

 

[SonicBurlap]

I was just wondering if anyone knew if they work in the X-Ray and Bravo as well?

 

[Massoud]

For anyone looking at the SAC mag block thing, it's just for the Whiskey-3 and may fit early X-rays with the forend without the Mlok slots on the side.

Note that we were working on something at the same time so any W-3's shipping since June '19 are incompatible with the SAC block. We incorporated a feature that does its purpose into the Rem 700SA and Tikka T3 inlet.

For the Rem 700LA, the block will still work with CIP length mags but not when using the spacer for standard magnum length mags.

Thanks guys,
Justin