Need New AGM gearbox.

[dlc43]

I just got my AGM Mp40 yesterday.
after attempting the full auto only conversion and spending 5 hours attempting to reassemble the gearbox without everything flyin apart I finally pitched the gearbox into the trees behind my shop in a fit of anger,
Does anyone carry replacement gearboxes for these?
It's a brand new gun and I hate to just toss it in the dumpster.
It just wouldn't go back together.
And yes I had all the parts in the right place they just wouldn't stay lined up on assembly.
Finally became disgusted with it.
I need a new gearbox though if anyone knows where to purchase one.
Thanks.

[YankeeDiv26]

lol we've all pitched somethign into the woods at one point in our lives. i suggest moving this to the airsoft and impression market thread to please the gods err i mean mods and to get more views.

[DeB]

It will be quite hard to find one... don't you can go to rescue the gearbox from the wood??
Or it is damaged??

Try to contact some seller (WGC, gunner) to ask for replacements parts i think it should the only way...

[killbucket]

When I take mine down for a new spring, I will devise a jig for doing this, as I'm sure to need it in the future. I will post the plans for all to use. The factories HAVE to be using a fixture of some kind...

Much easier to just wedge the selector plate on the gearbox. I wouldn't open the box just to remove those parts. (ten seconds to open, five hours to close!) You can pull the wedge and fire once after a day's use to unload the spring.

On my Browning conversion, the plate is held into full-auto mode by the mounting bracket. Since there is a window in the cylinder, I will put a mark on the piston at full forward. Then I can tap-fire it off spring tension at day's end. I may add a cam lever to release the plate, just gotta find time to design the thing.

[Gordak]

The box basically would cost as much as the gun, so you might as well get another gun
and sell your current one to someone who wants a wall hanger.
-Gordak

[2ndranger]

I can say I broke my fair share of Items in a fit of anger... just hold your breath and count to 50...then everything went black and I cant remember from there...

Schutze

[heinz]

I just try counting to 10 before chucking something. But I use that ten seconds to find something cheap to chuck

[dlc43]

gordak said:

The box basically would cost as much as the gun, so you might as well get another gun
and sell your current one to someone who wants a wall hanger.
-Gordak

The problem is from everything i have read on this gun the grease has to be replaced so a new gun is going to be the same problem.
I really cant afford to get $300 tied up in one of these.
I guess I will stick to my thompson and forget doing german at this point.
It sounded easy from the posts but believe me it's not.

[killbucket]

Replace the grease? Why not just squirt some in thru the motor hole, and the trigger lever hole. It should work its way around.
At $129, I'm not sure how many I will be rebuilding. Depends on how long destruction takes to happen. What exactly have you learned?
I usually open boxes to install upgrades before they can fail.
I've had my share of 3a.m. tears and frustration Just keep at it. The A/R latch is probably the worst, followed by the trigger and it's spring.

[dlc43]

Actually I went and found it, Scrubbed the crap out of it and as of the 173,543rd attempt at putting it back together it worked.
The reason I have heard for replacing the grease was the grease they come with is petroleum based and eats the hop up seal.
I wiped alot of this grease out of the hop up mechanism myself afterv only 150 shots.
I replaced the grease with synthetic teflon based grease.
The action itself was packed full of grease when I opened it up.
I just read that the petroleum based lube will eat rubber seals.
I would have probably lived with it till it failed however except i wanted to get rid of the semi auto switch.
It is working again amazingly.
I want to upgrade it eventually but I am going to wait tilll something breaks before I go digging into it again.
Pain in the a$$ I tell You!

[biged]

I repaired and upgraded over a 1,000 guns.
I've been sent alot of gearboxes in a ziplock bags to re-assemble.

There was a photo circulating 4 years ago of the Marui plant.
Three blocks on a table to hold the box. The rest was done by hand.

There are alot of links and videos on how-to close up a box here's my advice:

Get a set of picks like these.
www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=94500
Aside from a screw holding screwdriver, they are the most used item in my toolbox.

1. Make sure the piston is in the gearbox rail correctly.
2. The nozzle and tappet plate are correctly attatched.
3. The Sector gear cam is at 1 o'clock.
4. Anti-reversal latch spring is in the correct position.
5. The trigger & trigger spring are in place.

With my right hand I put 2 fingers (Index and middle) through the right side of the gearbox cylinder hole. The with those same fingers push down on the cylinder and put my thumb on the bottom outside edge of the gearbox to hold it.
With the spring guide in the spring push it into the piston and correctly set the spring guide into the gearbox with my left hand.
Manuver the right side of the gearbox off your fingers and onto the left half of the gearbox.
Get the front of the gearbox on first. Sometimes you have to get the back on first. Monster M170 (500fps - take 2 people to put in safely) springs com to mind.

If it does'nt close: (They hardly ever close rite up)

When the bottom half does not close:
With the straight or offset pick reach through the holes and align the bushings/gears and the anti-reversal latch.
They are the culprits 99% of the time.

When the upper half (or back) does not close:
Reach inside the back by the spring guide with the straight pick to wiggle the spring guide. It lifts up or tilts not going into the gearbox slots/holes.
Also depress the nozzle, this assures it is working and the tappet plate is in it's track.
Finally check the trigger. Trigger springs sometimes pop out, which you can push back in with a pick.

After you get 1-2 screws in it, check the nozzle and trigger again, slide the selector plate to make sure the safety is working. Check it now before you reassemble.

How do you get a room of airsoft players to quiet down?
Close up a gearbox...

///ed///

[DeB]

dlc43: I think that you have never tried to open and close a versione II gearbox!! It is painful, not the AGM one!!! But I have understood that you have repaired it. So good job anyway!!

[lopik]

Hi!
i have another questions about gearbox and upgrade of MP40:

1)which shape of battery pack do you use for upgraded (M120) ...9,6V?
2)which nozzle is similar with MP40?...i can only say that G36C not:)
3)How can I simply get to the barrel...how should i take out the "flash hider" if it is needed...the outer lbarrel is very solid and i dont want to destroy it!

sorry for my english:)

[Russianboy]

2ndranger said:

I can say I broke my fair share of Items in a fit of anger... just hold your breath and count to 50...then everything went black and I cant remember from there...

Schutze

LOL, I've been known the throw a gearbox a time or 2. (good thing they were cheap gear boxes).

[CharleyNovember]

I think that is why he has me work on gearboxes...of course the wait time sucks for him.

[DeB]

3)How can I simply get to the barrel...how should i take out the "flash hider" if it is needed...the outer lbarrel is very solid and i dont want to destroy it!

You have to unscrew the muzzle, pull out the aim cross, then unscrew the big exagonal.
after that you should unscrew the screw under the big exagonal and the two screw on the top of the magazine housing and pull out the plastic in the mag housing. there are other two screws on the left and right to unscrew they are external you can see them in front of themag housing.

after that you can pull out all the barrel and hop up unit.

Sorry for my english too...
Ciao!

[lopik]

thanks Deb!!!

i will look at it and try to improve hop up chamber cause my "bullets" have very different distance of shooting...hop-up doesnt work properly:(

Have you tried to use another hopup chamber? Somebody has mentioned an AK hopup chamber but not the results of this project.

thanks in advance

[DeB]

the AK chamber will be compatible only after a lot of modding... nothing of impossible but time consuming.

There is also an old post where taffy (search for "taffy") had made a simpler and positive mod to the original chamber.

Bye!