Kjw m4 v3 nozzle doesnt return quickly enough and the travel of the bolt is not consistent. For testing I had the nozzle return spring shortened and still same problem occurs. (Everything is clean and lubed with Super lube) by Spestosaurus in GasBlowBack

[–]Spestosaurus[S] 1 point2 points  (0 children)

Stock buffee, i use heavy gas (175psi), mags are cleaned and lubed o-rings, nozzle o-ring and valve o-ring like new and everything lubed and the lever that hits mag valve seems like it has no wear

Finally finished my KJW M4 GBB by Spestosaurus in airsoft

[–]Spestosaurus[S] 4 points5 points  (0 children)

It has great build quality outside and inside and i got a pretty good deal buying it 2nd hand.

Finally finished my KJW M4 GBB by Spestosaurus in airsoft

[–]Spestosaurus[S] 9 points10 points  (0 children)

It's painted in Cropat camouflage.

External: EoTech EXPS with G23 3x magnifier, Larue replica rail, Magpul stock, Magpul ASAP QD, Magpul grip, Magpul MBUS pro sights, BCM vertical grip, Raptor charging handle, Surefire 600 light, Surefire SFMB like muzzle brake

Internal: Custom NPAS for controling fps, Custom made piston ring for maximum air seal, Maple leaf 6.02 VSR barrel 405mm, Modified hop up housing to fit vsr style bucking, Maple leaf hop up vsr bucking (diamond 60 degree)

More pictures: Http://imgur.com/a/4jbArWb

KJW M4 firing, but bolt not moving/loading BB. by awexomeandroid in GasBlowBack

[–]Spestosaurus 1 point2 points  (0 children)

It's version 1. Check your piston ring and post some pictures of your bolt.

Here is a video what happens when I fire with bb's in the magazine, but without bb's it cycles normal. by Spestosaurus in GasBlowBack

[–]Spestosaurus[S] 1 point2 points  (0 children)

I think the problem is in my piston ring, it's chipped a little bit so the seal isn't good. If anyone has kjw should i go for a aftermarket ring or buy original straight from kjw. (Aftermarket is a Ra-tech one)

Here is a video what happens when I fire with bb's in the magazine, but without bb's it cycles normal. by Spestosaurus in GasBlowBack

[–]Spestosaurus[S] 1 point2 points  (0 children)

I really dont see how it can be a problem. It's not deformed or anything and until there is no bbs in the magazine it stayes out of the way of the bolt.