Tanio Koba / KJW M4 GBBR Basic Information and FAQ

[baker_Jeff]

Canadian retailers should have more mags available mid-June, if you can afford to wait

Jeff

[sushi_boy604]

Originally Posted by Rookie Ab

Yes,you need a new one.I would think that all your gas pressure is slipping past and the bolt is not cycling proper.

You could order the Cradle oring piston instead of a stock replacement piston ring.

Is your return belt damaged or stretched? part#26 I'm just wondering how that would happen to the piston ring unless it was being pulled back too far(all the way out) of the cylinder.Then catching the edge of the cylinder as it goes forward.I'm pretty sure that is what the belt is for to keep that piston from pulling all the way out of the cylinder. (my 2 cents)

Thanks guys.

I've been hearing hearing things about replacing it with the stock piston rather than the Cradle piston - vice verser. It feels like there are two options to consider. Is there a reason behind that? I ask because I thought I would be replacing the stock piston but I've stripped it on the sides while trying to place my pliers to remove it.

Also, my first picture shows the cylinder having a piece snapped off. Will I need to replace that too?

Part #26 looks alright. I had issues when I received the gun so I assume it was already damaged in a way where it would create more damages.

[Rookie Ab]

yes,order a cylinder also.

[SKI]

Does anyone know if the outer barrel can be shortened or is it all one piece? I noticed that there is a seam under the front sight but that is not for shortenning the barrel. I don't want to mess with it if it is not doable.

[Karloss]

KJW \ Tanio Koba has release a new version of the famous GBB-R M4. The new model feature short outer barrel and RIS.

[Thenooblord]

plug from other thread:
the band in my KJW M4 just broke, first I tried a wide rubber band, worked well, the ROF was increased and it cycled properly, probably wouldn't last too long though, and it was too stretchy and cant pull the bolt far enough back to lock on an empty mag, then I found an old inner tube, and after ALOT of trimming, i managed to get it to fit, and seems to work well, for now, not sure how long it will last however

[baker_Jeff]

I can get the spare band if you want it Alex :P

[Thenooblord]

this works fine and was free, but i need the piston cups Jeff >:D

[Thenooblord]

BAHAHA! In lieu of sitting twiddling my thumbs waiting for a cradle piston cup to arrive, I SUPERGLUED the cracked piston cup back together... and it works like a dream! lol!
probably not for long, but will last till I get my replacement :P

[Vieler]

hi guys, i have had mine for about 2 months now, i was able to put on a Knight's type RIS, D-Boys Troy Style Tactical RIS Foregrip w/ Switch Pouch (with a little mod), a replica eotech, o-ring piston, velocity reduser, and a cheap led light. Here is what it looks like.

[Thenooblord]

my hopup dial doesnt seem to be working properly, I spin it and it doesnt seem to move the nub, and is it supposed to turn forever, or stop at some point?

[Rookie Ab]

Originally Posted by Thenooblord

my hopup dial doesnt seem to be working properly, I spin it and it doesnt seem to move the nub, and is it supposed to turn forever, or stop at some point?

I had the same problem with my hop up trying to use .28's. In the Arnies forum on the KJ-M4 (a must read) on of the guys suggested shrink tubing over the hop up arm. I used 2 pieces and now I can over hop 28's if I want.

The hop adjuster dial will only increase hop for one revolution and then starts over again. If you turn it the other way you will see it only make one rev and then stops.

[Thenooblord]

ah thanks, is htere any way to tell what point is maximum hop? is there an indicator? and yea im using .28 silicas

[Rookie Ab]

If you turn the hop dial backwards(hop off) it will stop at one point,at that spot on the dial I put a spot of white out on the dial and that way I know when I'm approaching maximum hop, just before it jumps back to minimum hop.

[andrew321]

Here's mine...These photos will be replaced once I can borrow the Rebel to take some pictures..





It looks solid and shoulders nice with the full stock. Ordered 8 more mags tonight!

EdGi full length 6.01 tighbore, Cradle piston, Cradle vel reducer, Acog bolted onto carry handle. Simple and solid, except it's extra loud because it shoots so hot it breaks the sounds barrier...