G&G MP5 SD5 BB strength?

[mirinjawbro]

Hello all

have a G&G MP5 SD5 Full metal (blowback version)

how strong are these internally?

i talked a while back about messing around with a project gun, but this is already here

thanks

 

[Lozart]

Strong how? What are you planning? 

 

[mirinjawbro]

upgrade motor / spring . maybe diff inner barrel.

 

[Lozart]

upgrade motor / spring . maybe diff inner barrel.

High torque? High Speed? DSG wanker gun or DMR?

 

[mirinjawbro]

not sure yet

any advice?

 

[BigStew]

The blow back mech puts more strain and more holes in the gearbox so they are weaker than a convention v2 gear box which can crack at the front any way. You need to decided what you want the gun to do 1st before you can think about upgrading.

 

[Cr0-Magnon]

Edit: wrong thread ?

 

[Lozart]

not sure yet

any advice?

Without knowing which way you're planning to go, not really.

In general though, they're...ok. I did a build with 16:1 gears and a basic mosfet a few years back and it's held up OK so far but the blowback function is pneumatic and uses a hole in the top of the cylinder to bleed off air to make it work. My advice there would be to swap the cylinder for a standard one without the hole as it will help with power and consistency enormously. IIRC the gearbox has cast ridges on the inside that makes it a pain to use something like a Gate Aster as the ribs need removing to be able to put the stickers on the gearbox.

I wouldn't go mad with it though, the front of the gearbox shell is known for being a bit fragile (unless of course you just HPA it in which case the world is your crustacean).