MP40 Hopup/barrel replacement?

UP! Every little piece of info is valuable! Did firesupport do this mod on your AGM? Did you do the mod yourself? Please send me pictures or info!

thx in advance!

The cheapest way is the one I sent you

I have yet to see a fire support one, be intresting to se how they did it,

Steve.D

Locutus has had his AGM done by firesupport, he's going to send me pics of the mod...

I don't really want the cheapest, I want the one where I can change hopup rubbers/barrel/... easily and where everything is put together as mechanically as possible (vise, clamp, ... no glue)
So it can be taken apart and put back together...

If that fails, I'll definately do your mod But I just HAVE to try!

hi mate,
pm'd the info & pics you needed with a bit more information on the modification fire support did.

cheers

This looks pretty close to the MP40 hop but takes a "normal" aeg barrel and hop rubber. I've ordered one, just out of curiosity. http://www.redwolfairsoft.com/redwolf/a ... odID=24961

Biggest problem I've found with the MP40 hop, both standard and modified, is getting enough action on the bb. Last one I modded, I used the old "biro" insert but that still wouldn't put enough hop on, so I kept the biro bit in but also put in a normal hop nubbin as well. The gun now shoots very well with this setup and an MP5 tighter barrel.

i did taffys hop fix and it worked moderately well, i recently paid firesupport to do their mod on my mp40 and i must say its worth evey penny!

Thx for the replies, and thank you again Locutus, your pics helped me a LOT!

@Sgt.Heide: It does... Let me know if the type 56 hop worked... It does look quite plug&play to me Maybe a bit sanding too, but definitely lesser then if you'd had a standard AK hopup...

sorry for the necropost but could you please pm me the guide please steve as it wont allow me to pm you.

thanks

MP40's will take AK hop units and normal aeg barrels with some fairly simple modification to the hop unit.

HoChi, send me a pm instead... I have the guide.

Thanks to Yith/Steve D. for the hop mod! My Mp40 shoots as far as my MP44 if not as hard. Amazing what changing the barrel can do. I'm just curious though, has anyone tried modding the AK hop unit to fit in the AGM MP40? Just asking since Steve D's method is rather permanent. You will still be able to replace the hop rubber afterwards but not the barrel. Unless you can get the spacer off without damaging it. Has anyone been successful converting an aftermarket AK hop unit to fit?

Thanks to Yith/Steve D. for the hop mod! My Mp40 shoots as far as my MP44 if not as hard. Amazing what changing the barrel can do. I'm just curious though, has anyone tried modding the AK hop unit to fit in the AGM MP40? Just asking since Steve D's method is rather permanent. You will still be able to replace the hop rubber afterwards but not the barrel. Unless you can get the spacer off without damaging it. Has anyone been successful converting an aftermarket AK hop unit to fit?

Yes, and its very simple and fairly quick if you have a belt sander. If not it could take a while with files and sand paper.

The barrel clip on the AK hop unit is square, round the corners off flush with the hop unit.

The feed tube needs shortened, but dont make it the same length as the original, leave it an extra MM or two longer, as it'll ensure good feeding with all mags.

The diameter of the feed tube needs taken down, to fit through the plastic magwell insert. Make it a tight fit, this way theres no glue involved in holding the hop unit in place, and its solid as a solid thing. A slight chamfer will need to be put on the lip of the feed tube to allow it to engage the spring loaded clip that retains BB's in the mag when not in the gun. Swap the slider for the original Mp40 one. You may or may not need to shorten the slider also. I've got mine setup with a madbull blue hop rubber, big-out h-hop nub and a generic chinese aeg barrel(likely a 6.03), and it shoots very well. Every bit as good as my HP PPSH with the same madbull blue/h-hop/barrel setup. Great range.

@Graeme - Thanks! I'll try that. Did you have to do anything about the tabs for the screws on the hop units not matching? It it ok to leave the AK hop unit unscrewed to the receiver?

Aslong as you make sure the feed tube is a tight fit in the magwell liner there will be no issue with it not being screwed together.

Going with Graemes AK hop chamber mod:

The barrel length you require is between 240mm and 250mm

The AK unit will remain in place with AGM mags, but with KA mid caps, you might find that the hop will move up as you put the KA mag in. This is because the magazine feed hole is narrower in KA mags than AGM mags. The removable plastic magazine housing is also VERY fragile so the less strain on that the better.

My solution is as rough as a badgers arse, but it works.

What you do is file a 5mm wide by 3 mm deep channel across the underside of the hop "block" from one side to the other and then secure the hop unit to the hop block with a cable tie, making sure the cable tie is sitting in the groove that you just filed out. The groove is required to make the plastic magazine housing sit flush when screwed into the block when the cable tie is in place. The purpose of the cable tie is to stop the hop moving upwards when the magazine is inserted.

Make sure the groove for the cable tie is far forward enough so that when the cable tie is tightened on the top side of the hop chamber, it doesnt interfere with hop adjustment. Then clip the cable tie ends so you can open and close the port cover easily.

You could drill and tap threads to secure the AK chamber lugs to to MP40 hop block, but they are too close to the original MP40 chamber lug holes. If your like me you might not want to burn them bridges if you change your mind and want to revert to the original hop chamber.

My hop fits as snug as a bug in a rug in the plastic mag well liner, and its plenty solid enough for it? Strange, chinese random quality control at its best! I had considered drilling and tapping new holes in the metalwork I have to admit, but mine seems plenty solid.

I know!!
After only 7 months airsofting I have already cultivated a love hate relationship with the chinese manufacturers!

A discovery(to me anyway!), worth mentioning.

IF, and I know its a big if, you can split the mp40 hop unit from its barrel(its bonded, some cases quite well, others not so it'd seem), you can swap the hop rubber for a normal AEG hop rubber, cut down a bit. It performs well too. The stock hop rubber is quite tough, I don't think the mp40 generates enough power to make use of such a hard hop rubber to be honest. I've got the stock hop rubber out of a Zeta Mossy(its all i had! but its nice and soft!) in it and an H-hop nub, and it seems to do quite well range wise. Still a bit of a spray to it, but it is a short barreled SMG I guess.