40MM grenade info.

[Lord of Rebirth]

Ok so I'm not looking to buy any 40MM grenade stuff as I'm not age-verified and I'm not gonna try and play the system. What I'm looking for is specific info on 40MM grenades and how they work and such. I'm gonna be hand making a friend a rig and she is gonna be the team grenadier so I need some info on stuff like exact size of shells and stuff.

I'm also working on the early stage of a pet project to make a bolt action 40MM shotgun so some measurements and functionality info would be a great help.

[TokyoSeven]

Long story short, BBs are loaded in the front of the shell and retained in their holes by Orings. Gas is injected into the bottom of the shell and is stored in a reservoir. When the contact on the back of the shell is pressed the gas inside the reservoir is released and pushes the BBs out of the shell.

Dimensions of grenades vary, they may all have the same diameter but there are all sorts of different lengths.

[Lord of Rebirth]

I knew most of that. How accurate is the 40MM diameter? And what is the variance of most launchers' barrel inner diameter? Also what does the firing pin look like, where is it and what size is it?

[Thenooblord]

its just a pin in the back of the launcher, you can fire a grenade with your thumb, so it doesnt have to be precise by any means...

[ShelledPants]

You could always buy 1 grenade and build the system around it... instead of building a system and then buying the grenade...

[Lord of Rebirth]

Ah. That is great. How does barrel length effect it? I'm far more interested in the shells that fire less BBs such as the 60 and 80 rounders which I hear fire longer distance and I'd assume straighter but on the larger shells like the 208s and 240s would a 20" barrel cause BBs to bounce off the side walls and interupt the paths of each other?

Good point ShelledPants but do you not need to be AVed to get a grenade?

[H1TMAN]

nope. Airsoftparts.ca has plenty of grenades to choose from.

[ThunderCactus]

Barrel length has nothing to do with it, barrels only make a difference when your bb is able to fly directly down the center, there's no way to do it with an M203, so 1", 3", 6" barrel makes no difference.
Correct, the KA 60 and 96 rounders do shoot further than the 120 and 192 rounders.
Buy king arms shells, they're REALLY good and they offer replacement parts for when they do wear out (and they do wear out).
Store them with gas in them, same idea as a GBB mag.
The 40mm diameter is no accurate at all, as I recall they were 39mm, but you might as well just buy one from ehobby and measure it yourself. You don't need to be AV'd to buy from ehobby and it's not something they would likely stop at the border lol

The gas is held in a central chamber, the BBs on the outside wall. The gas is held it by a bearing locked valve. When you push up on the firing pin on the back, the bearings are unlocked and the valve gets pushes open by the gas pressure. The gas then escapes through the only place it can, where the BB's are.
After firing, you need to reseat the valve by pushing the firing pin in as far as you can, then reseating the firing pin. This assures the valve is in a sealed position and all the bearings are in the locked positions. You can then reload the shell with gas and BBs.

Anything else? lol

[Caboose03]

Originally Posted by ThunderCactus

Barrel length has nothing to do with it, barrels only make a difference when your bb is able to fly directly down the center, there's no way to do it with an M203, so 1", 3", 6" barrel makes no difference.
Correct, the KA 60 and 96 rounders do shoot further than the 120 and 192 rounders.
Buy king arms shells, they're REALLY good and they offer replacement parts for when they do wear out (and they do wear out).
Store them with gas in them, same idea as a GBB mag.
The 40mm diameter is no accurate at all, as I recall they were 39mm, but you might as well just buy one from ehobby and measure it yourself. You don't need to be AV'd to buy from ehobby and it's not something they would likely stop at the border lol

The gas is held in a central chamber, the BBs on the outside wall. The gas is held it by a bearing locked valve. When you push up on the firing pin on the back, the bearings are unlocked and the valve gets pushes open by the gas pressure. The gas then escapes through the only place it can, where the BB's are.
After firing, you need to reseat the valve by pushing the firing pin in as far as you can, then reseating the firing pin. This assures the valve is in a sealed position and all the bearings are in the locked positions. You can then reload the shell with gas and BBs.

Anything else? lol

actualy barrel length does have an effect on it, its like a realsteel shot gun basicly and the longer the berrel the tighter the spred. if u want a real tight spred and longer barrel will help do that. most store bought grenade luanchers ar all too short to make a noticable diference how ever since you said your building custom plateforms you may want to keep that im teh back of your mind

[Lord of Rebirth]

Sounds simpler and easier to work with than I though. Any idea on the weight range of shells? I'm tempted to work on a Mk-19....

[Lord of Rebirth]

Sorry to double post but ThunderCactus said shells would not likely be stopped at the border if bought from ehobby. Is this true? Is it just the shells? They have some nice stuff and goo prices but I don't wanna lose my money trying to import something i can't import.

Also what is the ruling as to bringing some back across the border while on a trip to the US?

[Caboose03]

Originally Posted by Lord of Rebirth

Sorry to double post but ThunderCactus said shells would not likely be stopped at the border if bought from ehobby. Is this true? Is it just the shells? They have some nice stuff and goo prices but I don't wanna lose my money trying to import something i can't import.

Also what is the ruling as to bringing some back across the border while on a trip to the US?

Id just buy them from local places or airsoftparts.ca when I look at teh shipping from Ehobby its pretty steep so u really dont save that much then buying local

[ThunderCactus]

I've bought all mine from ehobby, one package got inspected and sent through.
If your making a shotgun, then a 20" barrel would make a difference, but any standard 40mm launcher length barrels won't make a difference (that was the point I was making)
If you just want to make a realistic shotgun, airsoftsurgeon makes buckshot and slugshot shells you could use as an alternative.
But I have to admit, even I thought of making a 40mm pump action shotgun....
http://www.redwolfairsoft.com/redwol...gshot_5pcs.htm

[Drake]

Originally Posted by Lord of Rebirth

Sounds simpler and easier to work with than I though. Any idea on the weight range of shells? I'm tempted to work on a Mk-19....

lol a Mk19?

Given the shells cost $50+ a piece, you better have some pretty deep pockets if you plan on having even 10 shells for it.

[Assault Pioneer]

Originally Posted by TokyoSeven

Long story short, BBs are loaded in the front of the shell and retained in their holes by Orings. Gas is injected into the bottom of the shell and is stored in a reservoir. When the contact on the back of the shell is pressed the gas inside the reservoir is released and pushes the BBs out of the shell.

Dimensions of grenades vary, they may all have the same diameter but there are all sorts of different lengths.

hehehe


It sounds dirty when you say it