upgrade blowback housing for KWA kriss vector
 

I have recently acquired angel custom reinforced speed blowback housing for my kwa kriss vector http://www.evike.com/products/49278/

it didn't come with instructions on how to install it , only a very small flat screw driver was included in the package.

how do I install it in my Kriss?

Try this couple of videos. https://www.youtube.com/watch?v=wT4X-XT5x0k

I checked the video, it was good, but it didn't show me how to install a blow back housing unit

hey guys, I still need instruction on how to install Blow-back housing for my bolt

Try following the exploded parts diagram in the manual.

Fairly certain I recall taking that housing out with no tools.
Gbb assembly drops out, take the cover off the bottom of the assembly and I think the bb assembly just dropped out the bottom and just rotate the housing to get it out.

So, according to the manual diagram, I think that I need to remove part 518 (piston spring hanger roll pin) how do I remove it without causing damage to the bolt. I tried to hitting the pin with a hammer and small screwdriver to no avail. How do I remove it and and install it proper?

Looks like a normal roll pin.
You need a punch of the same size, since you'll have to tap it all the way out. Go to Canadian tire and buy one of those single sleeved twist drills of the proper size. Probably .5mm?
Snap the twist drill part off (as it can break during punching anyway) and use the shank to punch the pin out.

you are saying that I should take a .5MM drill bit. Snap it in half. Use the remaining drill bit to punch the pin out of place.

yes

If you are willing to come to Bolton on I'll do it for you for free and maintain you're entire gun. I really want to comparing this blowback housing to stock

I snapped a .5mm screw driver and that did the trick. Quattroisking, I live in Langley BC