Home made blowback functionality (EBB) for AEG
 

Hello Everybody
I am new person here on forum and would like to ask community: is would be interesting for people, if I can share my work to make EBB function for variety of AEG:
1) Matrix POSh-41 original EBB was converted to EBB with open bolt
2) AGM MP-44
3) AGM MP-40 open bolt
4) Cyma AK104
5) JG AK-74 my modification of existing EBB

Please let me know what it would be most interesting and I will post it

Thank you

I'd be interested to see how you did the cyma ak

Cyma ak
 

Here is a youtube video with how the blowback works: https://www.youtube.com/watch?v=SwufNwmtglI

Link to doc on google drive with steps and photos
https://drive.google.com/file/d/0B2u...ew?usp=sharing

(Had to do this since I coulnd't upload it as an attachment)

Impressive! If you got time make videos for all the guns! :d

So what actually puls the bolt back? Cutting down the bolt isn't a big of an impact as it is the pressure of the springs. Right now I hear your motor whining for sweet mother Theresa to put it out of it's misery.

If you used a shorter and weaker spring I'm sure you could accomplish better EBB. This is very similar to APS' EBB design. If you were able to set up a series of gears that are pulled by a separate electric motor or something other than the piston going back, that would be a real game changer.

A Kwa rm4 erg would be really neat if the fake bolt carrier reciprocated as it would lock back on the last shot fired, giving you a visual indicator that your gun is dry. I would be very interested to see you do one for an M4.

Homemade EBB
 

Answers on questions:
1) EBB is done by adapter which creates mechanical connection between piston
And bolt
2) Bolt is original, but cut almost in half to make it less heavy
3) Bolt spring original as well, but there is another short spring for cover button
( that one AK style)

More videos:
Stg-44: https://www.youtube.com/watch?v=0lZWspWHD_E
Ppsh-41: https://www.youtube.com/watch?v=qDkiTTdbt70