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Old 09-13-2015, 07:59 PM
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Know of a good lower receiver for a M4 with high magazine compatibility?

So a little over 2 years ago I decided I would invest in a high end AEG M4. I just wanted to graduate from my JG. So i went and bought a GP/Magpul M4. Everything seem to function just fine for a while then i ran into feeding issues. I tried everything i could think of at the time to try to fix it. I rebuild the hopup unit several times to ensure i was doing it correctly and even just bought a entire new one then installed it. Nothing i was trying helped much. I eventually shelved the gun hoping i would get around to sending it into a AEG smith.
I recently stumbled across a discussion which talked about the receiver on my specific gun. Apparently unless you use the gun manufactures dedicated Pmags then the gun feeds incorrectly. Now i originally thought that because it was an AEG built by GP/Magpul that Magpul P-mags would work. Well they don't. It all has to do with the shape of the mag well on the guns receiver. Now i am looking to try and just replace the lower receiver because of cost and use my existing upper. I need some input on what kind of lower receiver i should get that is know to have high magazine compatibility with other brands.

Thanks.
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Old 09-13-2015, 09:19 PM
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Most mag wells are built on the big side to allow for variations in mags; I've found my VFC lower is built a bit tighter; I haven't found any mags that don't fit yet, but it fits the amoeba p-mags I have like a glove and feeds perfectly; Seriously, you can hold the gun by the mag and shake it and nothing is going to move.

The only downside is the cost associated with the VFC, but after spending a year or so fighting with other receivers trying to get them to feed reliably without having to hold the mag or shim it, $400 is totally worth it.
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Old 09-13-2015, 10:43 PM
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I found this is this what you mean? http://www.evike.com/products/50909/
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Old 09-14-2015, 06:37 AM
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Most feeding issues with magazines are due to the bottom of the hop-up not connecting very well with the top of the magazine where the feed "tube" is, OR, someone left their AEG mags stored loaded for awhile. I've normally had luck filing off a very small amount of material on the spring loaded "BB stopper" in the magazine with a rat-tail file, but the downside is that you can completely ruin the part if too much comes off.

Can post pictures if needed.
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Old 09-14-2015, 09:29 AM
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Quote:
Originally Posted by shmartin View Post
I found this is this what you mean? http://www.evike.com/products/50909/
Yes, that is the correct lower, but I can't tell you if it'll fit your upper receiver or not; I use VFC uppers for my lower, and have found at least one other branded upper that fits but I have no idea who made it (Got it 2nd or 3rd hand)
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Old 09-14-2015, 11:08 AM
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Quote:
Originally Posted by Flenner View Post
Most feeding issues with magazines are due to the bottom of the hop-up not connecting very well with the top of the magazine where the feed "tube" is, OR, someone left their AEG mags stored loaded for awhile. I've normally had luck filing off a very small amount of material on the spring loaded "BB stopper" in the magazine with a rat-tail file, but the downside is that you can completely ruin the part if too much comes off.

Can post pictures if needed.
I am almost positive it has to do with the lower receiver's mag well. My magazines wobble a lot inside the mag well and i remember when i was first trying to fix the problem thinking wow this wobbles around alot but made nothing of it at the time. If i hold the mags in the gun with some forward and upward pressure the gun seems to feed fine. The proprietary magazines that were designed for this gun had a extra lip on the back of the magazine. No one want to have to hold there mag in while in a fight.
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Old 09-14-2015, 11:09 AM
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Anyone have an opinion on this one http://www.evike.com/products/32326
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Old 09-14-2015, 12:58 PM
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You can apply friction tape in your magwell to remove wobble. Or you can texturize your magazines with paint. You have several mods available to you that won't cost you $100. Also, you may still have to do modifications to the Madbull receiver after you get it.
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Old 09-14-2015, 03:15 PM
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Well i am in the process of rewiring my gun the stock wire casing is exposed because of it rubbing not being long enough. Also I broke the selector switch plate during disassemble. So i need to get the gun back to a functional state before i can try trouble shooting the problem again. Ultimately it comes down to do i change the receiver or replace all my magazines with ones that work. I haven't decided which route i want to take yet. I am still open to suggestions though.
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Old 09-14-2015, 03:32 PM
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Getting new mags is probably the easiest route. I'm positive you will have less head aches if you just buy new mags.

I honestly use MAG brand m4 magazines. I also use them as loners and I have never had anyone have any issues with them not feeding in their gun.
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Old 09-16-2015, 11:29 AM
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Quote:
Originally Posted by Texx View Post
You can apply friction tape in your magwell to remove wobble. Or you can texturize your magazines with paint. You have several mods available to you that won't cost you $100. Also, you may still have to do modifications to the Madbull receiver after you get it.

My fix when I had this problem with a JG was putting some type of tape in the magwell like the above quote...I ended up using the male side of a velcro strip, and it worked and still works today. I'm not partial to new magazines because they can cost an arm or leg to some players. Do whatever possible to not buy new

+1 Texx.
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Old 09-16-2015, 07:08 PM
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I am going to try this to see how it work out. Just waiting for some replacement parts.
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Old 09-21-2015, 05:56 AM
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Well. I have some good news. I am positive i found whats wrong with my gun. The piston head is partially cracked. I think its the culprit it probably has enough compression still to push the bb's down the barrel but not out making it look like a feeding problem. I wont know 100% till i get replacement parts. If replacing it doesn't fix the problem it still needed to be replaced regardless.
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Old 09-21-2015, 06:13 AM
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Good to hear you found the problem. Cheaper than a new lower lol.
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Old 09-22-2015, 05:52 PM
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Quote:
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Good to hear you found the problem. Cheaper than a new lower lol.
So true. I originally was going to send it to a smith to fix it because i was originally told by a close friend to not disassemble the gearbox myself. Do to the likely hood of screwing it up during the process. I just decided to do it myself regardless because i needed to have the gun rewired anyway and the smith might not understand 100% the way i want it done. So i just looked at multiple videos and schematics of my gearbox and got to work. I did break a flimsy plastic selector plate which i now replaced with a metal one.

Overall i am glad i did it myself i learned a lot about the internals of the gearbox and if i ever have a problem what to look for. Plus a airsoft smith would have charged me a ridiculous amount of money to fix it and to do the custom wiring job i wanted. I am making my gun capable of using 2 small type battery packs simultaneously for 2x the capacity. I could later make it 3 if i wanted by added a hand guard mounted battery box.
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Old 10-05-2015, 02:30 PM
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Just finished fixing my gun so the problem was in fact a partially damaged piston head which was giving off the classic signs of a feeding issue. So glad its final fixed cant wait to take it to the field.

Last edited by shmartin; 10-05-2015 at 02:38 PM.
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