DeB
Private
AGM MP40 - Marui M733 and G3A4 Revenant
Posts: 179
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Post by DeB on Feb 23, 2007 11:12:04 GMT -5
HellO! I have studied the hop up unit of the MP40... so I've changed the pressor and the silicon chamber (what's its name???) with one shortened of my G3... Now it shoots straight but some bullets go in other directions... maybe because the barrel and the hop up chamber are not the same thing but they are attached...
Now, have you tried to change it? maybe with a Kala hop up? The G3 hop up doesn't fit.
Thank you!!! Bye bye!!! ;D ;D
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Post by Guinness on Feb 23, 2007 17:59:39 GMT -5
Well..... I haven't been able to get to my hopup yet- the screw that holds the inner barrel in was apparently welded in place at the factory and I haven't been able to get it loose yet
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DeB
Private
AGM MP40 - Marui M733 and G3A4 Revenant
Posts: 179
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Post by DeB on Feb 24, 2007 3:10:36 GMT -5
What screw is it??
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biged
Master sergeant
Posts: 468
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Post by biged on Feb 24, 2007 6:19:03 GMT -5
The rubber/silicone tube is called the Bucking. The Pressor is also refered to as a "Nub".
I've used 14-gauge silicone wire insulation as a substitute (stripped from the wire) as a nub. You may have to go down to 16 gauge if too much pressure is extered and the hopup is ON even when it is turned OFF. Alot of armalite users go up one gauge to 12 gauge too add more pressure.
Try a different inner barrel and test the accuracy. Swap the inner barrel with one from another gun. The inner barrel will stick out - but at least you can tell if the problem is with the hopup or the inner barrel.
If bb's shoot straight then the inner barrel needs to be replaced. If the accuracy is still bad. Then you still have a problem with the hopup.
///ed///
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DeB
Private
AGM MP40 - Marui M733 and G3A4 Revenant
Posts: 179
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Post by DeB on Feb 24, 2007 7:20:06 GMT -5
Thanks, The problem is that the inner barrel is not compatible with the marui that I have. The bucking is in plastic and then after that zone the bb enter in the brass barrel. in that join there is still some problem I've used 14-gauge silicone wire insulation, me too!
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biged
Master sergeant
Posts: 468
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Post by biged on Feb 25, 2007 6:43:50 GMT -5
If you hold the inner barrels side by side what are the physical differences?
Bucking seam, hopup retaining notches, and hopup hole should be the same.
///ed///
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DeB
Private
AGM MP40 - Marui M733 and G3A4 Revenant
Posts: 179
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Post by DeB on Feb 25, 2007 13:33:05 GMT -5
... side by side... the cannot stay firmly in place, and also I have a G3 barrel, the difference won't be comparable... Maybe I have not understand what you adviced me... Bye bye! PS today I have used it! One magazine, 30 rounds, 2 BB loader, One BB bag. 6 or maybe 7 hit all morning long! yu!uh! I'm so satisfied of my MP40...
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Post by davem on Feb 25, 2007 15:43:23 GMT -5
Everyone likes accuracy, but I havent made any attempt to improve mine. My "indoor range" is 30 feet exactly. At that range I can shred a coke can. Of 30 rounds in a clip, perhaps 26 of them will hit a target about 9" in diameter.. yes, I get 3 or 4 flyaways in that group, that totally miss the target AND the bb trap.
After all, its modelled after a (relatively) primitive SMG, how much accuracy do you want?
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Post by Jager.Drü on Feb 25, 2007 19:28:25 GMT -5
True that, SMGs aren't nearly as accurate and have the rangs rifles do. They are for close range tagets where you can overwhelm with the ammount of bullets you can spit out.
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DeB
Private
AGM MP40 - Marui M733 and G3A4 Revenant
Posts: 179
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Post by DeB on Feb 26, 2007 11:39:19 GMT -5
yes ok, but a good hop up and a good barrel can get bb longer...
I will try a AK47 hop up maybe in next weeks, for now it is ok! Thank you all! Bye!
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Post by schmitty on Feb 26, 2007 12:33:20 GMT -5
Many people have reported that the AGM MP-40 is not as accurate as a stock TM gun. The AGM barrel is NOT compatible with a TM type. To improve the accuracy I believe you would need to swap the AGM barrel AND hop up chamber for a Marui AK type hop up and any TM style barrel. But it is not a direct drop in replacement. The screw holes don't line up. Would take some modifications but is possible.
Schmitty
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DeB
Private
AGM MP40 - Marui M733 and G3A4 Revenant
Posts: 179
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Post by DeB on Feb 26, 2007 13:21:56 GMT -5
Thanks Schmitty! Yes I will change all the Hop up and barrel, the hop up maybe it's better made of metal instead of plastic, to modificate it better maybe...
I checked out,30 feet are about 9 meters! not a lot, I had hit some "enemies" at 30 meters in open field yesterday, so it isn't so bad in precision but a good barrel and hop up T will work better!
Thanks again! Bye bye! Marco
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biged
Master sergeant
Posts: 468
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Post by biged on Feb 27, 2007 5:15:38 GMT -5
Thanks Schmitty, I still have not handled one yet...
Our batch of MP40's is arriving in the next couple days. (Mine is one of the them) Most likely fire a mag through it - then rip rite into it.
///ed///
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Post by neillblume on Mar 3, 2007 15:08:19 GMT -5
here is a link to a hop fix for the mp40. It is destructive so is not for the faint hearted, having said that its not too difficult - done by a guy here in england called taffy. it replaces the hop bucking and the barrel. we are investigating getting an ak hop unit to fit. This should only be done of your mp40 is firing to the right like mine was. www.diggah.net/docs/Taffys_MP40_Hop_Fix.pdfgood luck!
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biged
Master sergeant
Posts: 468
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Post by biged on Mar 4, 2007 7:12:23 GMT -5
Interesting fix, I'm glad you solved your issue. Your warnings in the PDF should be followed... At the risk of someone failing to perform that procedure correctly. I would strongly recommend waiting for an aftermarket replacement unit for those who have not worked on hopup units before. The MP40's (mine included) did not arrive . Has anyone compared a Marui AK47 hopup with a MP40 hop unit? ///ed///
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DeB
Private
AGM MP40 - Marui M733 and G3A4 Revenant
Posts: 179
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Post by DeB on Mar 8, 2007 13:02:33 GMT -5
Has anyone compared a Marui AK47 hopup with a MP40 hop unit? Not yet... Out of money at the moment... I'm downloading the PDF, I will read it later! Thanks! Also mine is shooting to the right, not every bb but one every 3....
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DeB
Private
AGM MP40 - Marui M733 and G3A4 Revenant
Posts: 179
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Post by DeB on Mar 8, 2007 13:21:14 GMT -5
I read it! It's a good way to try to improve performance! Maybe is not even complicated or difficult!
I think I will try maybe not cutting the original barrel plastic chamber but make something from scratch to center the Marui barrel in it, maybe a brass or steel tube is going to be the way!
I will give it a try! Thanks to taffy!
bye bye!
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Post by taffy on Mar 15, 2007 13:49:33 GMT -5
Has anyone compared a Marui AK47 hopup with a MP40 hop unit? Not yet... Out of money at the moment... I'm downloading the PDF, I will read it later! Thanks! Also mine is shooting to the right, not every bb but one every 3.... The AK hop is similar but not quite the same 9feed tube too long gab between the back of the hop unit and front of the gearbox the wwo fitting tans are not wide enough) it can be made to fit but the effort is as much if not more than re working the existing hop. I read it! It's a good way to try to improve performance! Maybe is not even complicated or difficult! I think I will try maybe not cutting the original barrel plastic chamber but make something from scratch to center the Marui barrel in it, maybe a brass or steel tube is going to be the way! I will give it a try! Thanks to taffy! bye bye! It's not majorly difficult (the warnings there to stop people whinging that it's too hard and their gun is now broke!) I've done two and will be doing a third soon. Everyone who's tried it has had drastic improvments in performance (which is good )
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DeB
Private
AGM MP40 - Marui M733 and G3A4 Revenant
Posts: 179
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Post by DeB on Mar 15, 2007 14:55:01 GMT -5
Hi Taffy! Thanks a lot for your job!!! Maybe tomorrow I will buy a barrel, a hop up bucket and a hicap MP5 magazine so I will get my MP40 functioning like every other ASG!!!!
Thank!
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Post by ketoprof on Mar 28, 2007 10:24:04 GMT -5
Hi all, it's my first post. First of all, sorry for english mistakes in advance. I've got an AGM mp40, I've already made some changes on gearbox (grease, spring, cylinder, piston, heads, single shoot selector); with a 9,6 battery 2000ma it shoots good. ;D Now I'm going to change hop up chamber and barrel with a TM type one. I'll try to use an AK hop up, a metal one I've got, and a madbull barrel. Unfortunately, the back of the AK hop unit and front of the gearbox should be too wide. Looking at the original hop chamber and the Ak hop chamber, in the back part, the first it's about 1cm longer. I will try to fit, there must be a way ... pheraps hooking up a piece of tube of the original TM bb loader. I don't know, I will try and I'll tell you. About hi-cap magazines: I got two UZI magazines, I'll try using them, it should be easier than working on Hop-up and barrel. As soon as I finish I will let you know... wishing I'll not destroy my unfortunate MP40. bye bye
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