Upgrading mp5k pdw barrel/cyl head/piston head

[Flea-ish]

I'm gonna do some upgrade work on my mp5k pdw over the next little while.

1) standard barrel right now (141mm), putting in 265mm 6.03 tightbore to extend into a suppressor.
so far: http://www.airsoftparts.ca/store2/in...oducts_id=1031

can i cut a 300 down without running into trouble?
and do i need a larger cylinder as well to even it out?

2) cylinder head: is a silent one practical?
so far: http://www.airsoftparts.ca/store2/in...roducts_id=774

3) piston head: aluminum or poly, to bearing or not to bearing?
so far: http://www.airsoftparts.ca/store2/in...roducts_id=780

[ShelledPants]

You could cut down a 300mm but ensure there is no deformation in the end, and crown the barrel with a file so that the BB breaks away freely. You're better off buying the proper length barrel.

You will need a cylinder with a hole halfway down the shaft so that there is a proper amount of pressure on the bb giving it the best fps.

A silent cylinder head is practical but only with a proper piston head, get them as a kit like the Systema Silent set. Otherwise:

Modify is great, go for a polycarbonate piston head with a bearing.

This is all my personal opinion, but I've built a similar system and it is great.

[Mitchell12]

If your dead set on doing it your definitely gonna want a lathe.

[Amos]

http://www.airsoftparts.ca/store2/in...roducts_id=543

Just get 247mm instead.