M14 Bulldog 7.62 replica project
 

just figured I'd throw this up here. I discovered a bullpup designed M14 rifle conversion project, and I thought to myself, if it can be done in realsteel, why not airsoft?

the idea is to basically make an M4 sized rifle that has the internal capabilities to be a DSR one day, though for the time being I know I'm not good enough to be a sniper, so I'm just going to be making my M14 a little easier to handle with this project.

http://www.shortrifles.com/images/opening_picture.JPG
http://www.shortrifles.com/images/Standup_web.jpg
images from shortfiles.com (note, I'm not sure if I'm allowed to post this link here, if not, please let me know. I just want to credit the manufacturers)
so, any thoughts on the project? materials the new stock should be made from etc? first model I'm probably making it from wood, then hopefully CNC machined aluminum once I get a working design

7.62 AUG? You'd be pretty much fucked.

It looks like it would weight a tonne if it were metal, maybe a stronger plastic or nylon fiber would be good for the body?

very ambitious

You might have problems with the trigger assembly since your gearbox will be at the gun's end while the trigger will be roughly in the middle. You might also have problems with the mag feed and hop=up placement. You should look for existing bullup aegs for inspiration and technical design.

I hope you succeed in making this nice bullup

wait for the new WE M14 and do it up right- GBB style!

they're making a GBB M14?! oh man, tempting, but I think I'll use my junker M14 first so I dont break a beautiful gun.

as for the trigger, its electric, I may rebuild the circuit since that's really easy, a momentary switch or something like that, I want to take a look at the AUG, and considering my best friend just bought one, I'm set.

I plan on using the stock hopup system, gearbox and feeding. I might have to make my own mag release, but I'm hoping that this stock will simply allow you to slide in your current M14 system without modification. at least, thats the plan. I'll post pictures of prototypes, should be coming in a couple weeks, I'm off for 2 months then this project will be finished by the summer!

heck, maybe I'll buy a real M14 and one of these stocks just for fun!
Oh, and as for the weight, yeah the real thing weights upwards of 10 kg, but is much lighter in polymer.

Love it, . . . till I have to carry it up a hill.

The last one reminds me of the WA2000.

well, fortunately I'm a rather big guy, gun weight doesn't bother me as much, plus I carry a rather heavy hunting rifle through the bush. Also, if this guns turns out to be rather heavy, I'll opt for squad support and sniper training xD

I also decided I want to keep the WW2 feel to the gun, so this project will be polished wood finish, and probably a lot less RAS rails

I have a solution for the trigger assembly! I'm basically going to build my own trigger circuit in the stock, but in the original trigger circuit I'll stick in a connector I conveniently have laying here, to technically it'll be the stock connection, just moved around. This is so that I can use the original stock, a JAE stock, EBR stock, or a bullpup stock. The gun wont be modified, just played with :D

Try a mosfet for the trigger.

I've never used a MOSFET before, what is it, like a relay?

yeah, like a relay. There are threads on here...lots of threads on airsoft mechanics...also lots of good info on Unconventional Airsoft...and DonP (asc tag) runs that site.

basically you can run wires to whatever switch contact you need to signal the chip to open power up to the motor. So then you're not bound to mechanical limitations for layout. You still need to break the gate contact when the semi-auto cycle finishes...but pfft, why sweat the small stuff :)

Go for it. Design looks cool. Head and scope placement looks kind of wonky...and the brass ejecting on the real thing must be a little distracting :)

Basically making a shell for the M14 and moving the whole thing back. I don't really see that you'll have any issues with the layout...leave room up front to run some sort of LiPo pack.

Or wait a bit for the gas version to come out and build it with that.

If you could make me one that'd be awesome. :)

Tys

Looks like a FAMAS SV mated with a M14 in the last picture. Would definitely be an interesting project to see someone do.

what kind of mechanical limitations are you referring to? whats the advantage of a mossfet or a normal switch?

For the time being, my gun's semi auto cycle doesn't even work, so I've been getting used to a quick tap to fire, but it would be nice to make something thats semi auto and full auto.

As for the battery back, at the moment, I have a couple large size Ni-Mh, but perhaps this build would be better with LiPo...

so far my design idea looks more like this: http://upload.wikimedia.org/wikipedi...ntal_Rifle.jpg
just with the internals in the stock. pretty flat, and simple. I'm planning on putting the battery up in the cheek rest or around that area, getting a piece of plastic or some plate held in places with screws overtop of the butt plate.

more thoughts on scope positioning: the SOCOM rifles have a barrel mounted RAS piece that is infront of the bolt system and far enough forward for the positioning I want, I'd like to find a 4x zoom or something simple, maybe a red dot at first with a mounted magnifier? so many ideas, so little time

ehobby had a front set of rails (4 sided) mounted to the barrel:
http://shop.ehobbyasia.com/cyma-m14-...uard-c-62.html

I'm very tempted to just add this to it, would make it looks kinda fun, little more EBR ish...

PS. IF this is successful, I may start making a couple, I plan on designing it so a TM compatable M14 can just slide in with no modifications (minus the trigger electronics). So mabye this summer I'll hit up the classified, I'll keep updating my progress. At the moment, this is all just theory

research mosfets and you'll find tons of info.

Mechanical in that you might not have to figure out how to make a linkage that goes back from the grip, around magwell and connect to the trigger mech already there.

If it's not going to be a select fire weapon...then don't sweat the linkage thing at all, just provide power to the motor when you want it to shoot.

That other rifle looks like ass...sorry.

A mosfet is a electrical switch that can be programmed....

while a normal switch is a mecanical thing....and for your SEMI not working, it's because your cutoff lever is worn out....

good to know! and as for the looks or the other gun, yes, it looks terrible. Like I said, its similar, but not exactly the same, thing wood finish AUG... actually, no, don't think that. I guess we'll see when i get started eh?

maybe I should get a new cutoff lever then... my full auto works perfectly though

yup thats normal..... the macanical switch assembly has a "slider" part that is attached to the rigeer, and when you pull the trigger the slide moves forward and completes the circuit. The cutoff lever is timed so that at a precise moment of the cycle, it will disconnect the slider, so making you only shoot 1 round = SEMI ..... but since its a mecanical thing, it can get worn out, and cause your gun to shoot full auto or burst....(because the circuit isnt disconnected after 1 gearbox cycle)

I have to change mine too, on my AEG....lol

yeah that definitely sounds like what its doing.

I still cant figure out the advantage of a mosfet, as far as I can tell, I still need a switching device to activate the mosfet? I don't entirely understand what I'm reading about them. Does anyone have an example?

mmm sounds like you're going to ahve problem with fitting the motor.... lol....IMO wait for the gbbr m14, and buy the stock! and mod it to make it fit! :)

Look at the Assembly videos about it on youtube :

YouTube- M14/ M1A BullDog 762 Assembly Part 1
YouTube- M14/ M1A BullDog 762 Assembly Part 2

No not always. You can have a non programmable mosfet. They are a fairly new thing to the airsoft usage. Where as straight forward mosfet circuits are not. This is what I am using.

MOSFET is an electrical switch. Microcontrollers (8-bit ATMEGA or PIC, or 32-bit controllers) are what you can program.

hey thanks for posting that video, I think for my first production I may stick with a simple bar and use the regular trigger assembly instead of new contacts... we'll see how it works. This does give me some great insight on how it works, thankfully the plans I'm drawing out are pretty close to what he's made. Mine wont have an aluminum wrapped stock, since there are no ejections to worry about... or bolt, for that matter. Should be fun! I'm starting cutting the wood tomorrow

Oh! and PS. once this is done, I'm moving on to make an SVU (SVD bullpup) ... that is, once I have the money, I wanted to make a full DMR this time, upgraded internals and externals, maybe 1.5 grand? if I'm lucky

haha get that budget to 2k...and you could buy the Real m14 Bulldog stock, and a gbb m14 (once WE releases them... :P)...I might try to do that in the future....since a m14 is too big for me....and i love the bulldog m14 stock!!!

haha well that might be a great idea to make one from a real stock, would be super cool.

however, I think at the current time, I'm going to be replacing the broken pieces, upgrade the bucking and finish this stock, then its going straight to the Classified forum... unless I end up falling in love with the bullpup design xD in which case I'm making an AK and buying an AVD front end and making that a bullpup

lol good luck with that project man! dont forget to post pictures of your progress ! ;)

I wont, but I'm leaving in 2 weeks for Germany, so my brother might take over this project, pictures will come this summer when I'm back