Realistic lock-back blowback?

[ScaredShooter]

Forgive me if all my terminology isn’t correct, I will accept constructive criticism.

So, I have an idea. Bear with me here.
This is a Marui Type 89 mag. Notice the little plastic follower piece. When you fire the last couple rounds, it pushes the final BBs up into the hop-up, so every round is fired.


Now, what if someone were to make one of these, in an electric blowback gun… When the follower reaches the top, and the last BB is fired, the follower hits a little button somewhere in the vicinity of the hop-up which lets a mosfet or simple computer brain know that the last round was just shot. This time, when the electric blowback cycles, the bolt mechanism is electronically or somehow locked all the way back. Ta da! Would that not be awesome? An AEG with a bolt/dust cover that locks open on the last shot, like real steel?

Please don’t tell me KWA is already designing one. Because somebody else (cough… madmax) told me they thought one might already be in the making. I said that would be crushing, sort of like in 3rd grade when my friend designed a hardtop convertible about a week before he found a Mercedes ad in a magazine for one..

I suppose I relinquished any aspirations to patent the design when I posted this.. But, what does everyone think? Could this be functional? Are there huge mechanical complications that I’m overlooking? Thanks for the input.

-Scared

[ScaredShooter]

Better yet, maybe the follower could have a copper metal tip. When it hits the top, instead of having to press a button, it would just complete a circuit as the final contact point. Then, the blowback mechanism would hold open.

[ScaredShooter]

I think that physical "last round fired, bolt locked back" guns are only going to be found in GBBRs.

This makes me very sad. Like after designing the record player, being told that people would never be able to listen to music in their cars.

How far does that follower go? I figured it would have to go up quite a ways in order to feed the last shot into the hop-up.

[Patrick750]

I think that physical "last round fired, bolt locked back" guns are only going to be found in GBBRs.

and systema max's

[timmah]

I think it'd be too difficult, especially considering the follower isn't supposed to push upwards in to the gun. An computer sensor would be easier, and in fact they are already made for AEGs.

I think this something like what Nasty was referring to.... http://unconventional-airsoft.com/webst ... cts_id=209

[ScaredShooter]

That's not what I would want. I would want it to always occur when the last round is fired and it's empty. That could be after 15 rounds or after 110, depending on how many shots you loaded into the mag.
And I guess I'm not following on the specifics of how this is too complicated.

[Nox]

nah, just have the follower break an 'eye', like in a CD player. If it follows a track that is seperate from the bb's then all it has to do is break the beam between the eyes and it would tell some circuitry to hold the bolt back.
They have IR beams in all sorts of things from safety devices to servo limit switches to CD players for the door retracter.
And they're *tiny*.

[CommieHunter]

Sorry, it has been made.

Tokyo Marui has done this in their M4 SOPMOD and RECCE series rifles, as well as their SCAR.

KWA is making it in their new M4 and AK line.

You can do it, but to custom make one is so far outside the realm of normal modding that it'd be very hard to make it work reliably.

[ScaredShooter]

Ok. Well Nasty, I'm not against Mosfets, in fact, I suspected that they would be part of the answer from the start. I just wasn't interested in that system posted by ti-ti-timmah (no pun intended timmy), because it commits you to a certain ammo count, whatever you prgoram, be it 30 or 40 rounds etc. I wanted this to be based off the BBs being completely gone, not after firing x number of rounds. Furthermore, the mag I posted at the top from a Type 89 (correct me if I'm wrong) does seem to have a follower nub that actually goes up into the gun, no?

Well, I wasn't really intending to custom build one, but it seemed like a cool idea to me, just for some AEG manufacturer to do.

And I liked what Nox said about a little IR beam, the thought was in my subconscious

CommieHunter, I guess part of me is happy it's been done and that I wasn't the first dreamer to conject such a plan.

[Low recoil]

Isnt KWAs new m4 going to do that
The KM4

[VogonFord]

The TM SOPMOD and Recce are blowback and the bolt locks back.

[VogonFord]

TM does cool things still :P You should check out their current product line. It's pricey but neat. FN Five-seveN, Type 89, G36K and AK-74M with EBB with metal where there needs to be metal. They're starting to really step up their game, although they're still not giving a rat's a$$ about selling in the US.

[ScaredShooter]

Yes, they are indeed pretty impressive. I don't quite understand, why have their guns had metal now? In the past my understanding was that they were limited by local law regarding how much metal could be on their guns. Now, it seems their construction is like everyone else's..?

[ScaredShooter]

Isnt KWAs new m4 going to do that
The KM4

You could always take a peek around before you ask questions like that.
(Yes)

[VogonFord]

The law has to do with the ability to convert it to a real gun. They just play it really safe because a lot of companies got screwed over in the 90's by making guns too realistic. There isn't actually any ordnance banning metal guns, they just don't want to jeopardise their business in a country that is already very much anti-gun and anti-military.