GBB Rifle Mag in AEG

[pizzainthemorning]

Before anybody tells me a GBB mag is meant for a GBB rifle and AEG mags are for AEG's... I know. I've got a mod in mind and I'm wondering if anybody knows if any GBB rifle mags fit in the magwell of a corresponding AEG. Specifically I was thinking AR variant but any info is welcome. I just need to know if it will fit in and properly engage the mag catch. I have a feeling like they'll be too big.

Thanks,

Alex

[xelamander]

go try it then.

[Dart]

*scrathes his head* ok only two things could come of this.

A: a mod to make your mags cost you twice as much
B: a AEG GBB hybrid bastard child.... AEG with GBB kick? the hell are you doing!

[cbcsteve]

It won't work, the mechanics internally of AEGs won't engage the mag even if it did fit.
- A proper mechnanism must engage the gas valve
- Modification of the hopup will be needed

Trust me I thought about it long ago, but after taking a look at the mech inside a GBB-r its best to just buy a GBB-r and tinker with that than tinker with an AEG

[Styrak]

Not to mention GBBR internals have NO similarities to AEG internals, even in the magwell/hopup area.

[pizzainthemorning]

As I said earlier, I know the mechanics and EVERYTHING is different. GBB mags are meant for GBB's, AEG mags are meant for AEG's.

Forget hop ups and gas valves and anything else incompatible for a minute. I just want to know if they'll fit in the magwell of an AEG and engage the mag catch. I can't try it because I don't have any GBB rifle mags.

Thanks,

Alex

[Brian McIlmoyle]

Not likely... GBBR mags are taller in the top end... instead of having a hole that the lower extension of the hopup extend into.. they have a projection above the mag for the nozzle to feed bbs into the chamber.. Like a GBB mag for a pistol

so... no they can't fit

[The Saint]

You could always be a little more forthcoming with your idea.

You need someone with a PTW and GBBR magazine to do a test fit. A PTW is most likely to accept a GBBR magazine, since its own magazines are realistically dimensioned.

A Marui SOPMOD/SOCOM likely wouldn't work because of the location of the dry fire stop mechanism interface.

[Ronan]

Wanna share more info?

So far it sounds:
Can a GBBR AR mag fit ina AEG. The answer is no.

[ujiro]

It almost fits. It went into my TM lower, but with some force. The magwell would need to be shaved down just a bit and it should work. As for the mag catch, well the mag catch is at a similar distance from the back of the magazine body, but obviously there is more stuff above it on the GBB mag than on the AEG mag. However, positioning alone, if you could get the GBB mag going high enough up into the AEG body, I am fairly certain the mag would catch on the mag catch

[pizzainthemorning]

Didn't mean to sound so secretive.

Essentially the idea is to make a gas blow back airsoft rifle using a drop in mechbox and modified mags. The mags will either be custom made, or possibly from a pre-existing brand. The mag well of most guns would have to be modified by drilling a small hole to allow the hammer to strike the valve. In addition, cocking handles would have to be functional. A normal mechbox will be gutted leaving only the trigger, trigger spring, nozzle, cylinder, and piston. The main power spring in the mechbox will be replaced with a light return spring. This will serve to return the modified piston/piston head to the resting position. The piston head will be modified such that it attaches to the nozzle (this is subject to change). At rest the nozzle will be fully forward, bb in the hop-up unit. When readied the nozzle will be fully back with a bb in the chamber. The piston will also be modified to accommodate the hammer/firing pin (Whatever term is more accurate). The hammer will be a simple linear drive with an in line hammer spring, interacting with the trigger directly via simple sear. Action will be as follows.

From a readied and cocked position the trigger is depressed disengaging the sear with the hammer. The hammer spring forces the hammer to strike the magazine valve in turn letting gas through the vent. The gas travels through the vent and splits in two directions, towards the bb/barrel, and towards the piston. Gas propels the bb down the barrel while at the same time fills the cylinder, moving the piston back and compressing the weak recoil spring. When the piston moves all the way to the rear due to the expanding gas it comes into contact with the hammer arm, a small protrusion from the hammer, and forces it backwards. This motion compresses the hammer spring, re-engaging the sear, and readying the hammer for another shot. The piston, now finished being pushed by the venting gas, is now pushed forward by the return spring, moving the nozzle with it to chamber another round.


There's more to it and I'm thinking out problems/modifying the design as I go, but here's a ghetto picture. Blue represents gaseous movement, and green represents kinetic movement. Something like that anyway.

Alex

[The Saint]

I don't think what you're suggesting would work, because it's like a standard GBB setup minus a float/rocket valve.

Without the rocket valve, all that's going to happen is that the BB will leave the barrel, followed by your entire mag of gas.

In addition, I really don't think the BB will provide enough counter mass to create a pressure zone to push back a piston and recoil spring on the scale you're suggesting. And once that BB is out of the barrel there's nothing to stop the rest of the gas of blowing out the barrel, since your piston won't actually back far enough to rest the sear.

Finally, if there's a port cut into the nozzle's bottom to let the gas in from the magazine, and the nozzle is connected to the piston, as soon as that piston starts any sort of rearward movement, won't the gas flow be cut off?

[Ronan]

Ok... i'll bite. Why do this?

Reason people buy GBBR is not because they run on gas, but because of the realism they give (mostly the blow back, and then the field strip).

People are already having a hard time with the WETTI system because its not a 'true' field strip. So imagine your system, that won't provide a blowback or a field strip.

Oh and if their was a market for that, it would already be fondle by current airsoft companies.

[pizzainthemorning]

Well the reasoning behind it was just a possible project, something to do. The good thing about it is that unlike most GBBR's, it's just a drop in design. So if you want to switch up from AEG to GBB it would be a simple disassemble. Any aftermarket barrels/hop units you could also be compatible. If you've already put a decent amount of money into a nice AEG, swapping out the mechbox might be a nice alternative to buying an entirely new rifle. Same as buying a gas bolt for a spring sniper rifle I suppose.

In terms of design problems, I'm working them out, it's just in the "idea" phase. The nozzle was the main point that's subject to change, and I was thinking of having the mag vent into the cylinder rather than the nozzle.

I have to take a look at my GBB pistol design a bit more because I did a bunch of this from speculation, but I don't see why the entire mag would drain in one shot. The only way that gas vents is because there's pressure on the valve. If the hammer only provides temporary (not constant) pressure at the moment of its strike, then there should only be a temporary vent.... Then again I do have a memory of draining an entire mag by shooting it with the slide off.

Still, lets say I put in a rocket valve of some type, a hi-flow valve in the mag, and a strong as hell hammer spring designed to give me a lot of gas in one shot, I think it should be able to handle pushing that piston back (remember, the spring would be a lot weaker than a stock AEG spring).

Anyway, it might take some work, may work and may not, but I couldn't help but notice that a mechbox is already set up with a nozzle, cylinder, piston, and return spring, just like a GBB. Why not try and utilize that set up? I know buying a GBBR is easier, but it's not about doing what's easiest.

Alex

[Ronan]

You still miss the point of a GBBR.

Blow Back
Field Stripping

People don't GBBR as an alternative to aeg, but buy them because of the feeling the blow back gives.