KJW M4 V1 return belt broken

[waltherglocksmith]

Broke my return belt (part no. 26), onto my kjw m4 last week.
Ordered the V2 bolt kit with the slide catch and buffer, replaced the 3 parts, and got lower power, half speed rate of fire, a real downgrade. So I returned the kit.
the return belt was verry hard to find, no more available on most airsoft store.

Did someone got this bad luck with the V2 bolt kit??? the seller told me that I was the only customer that got this problem.

[Karloss]

KJW V2 bolt carrier will have a lower RPM/RPS than the V1 because its heavier but half the FPS... something is definately not working correctly. You should rewrite your post in the KJW M4 thread maybe someone else experience the same problem and have an explanation. As for the FPS, usually KJW M4 shoot to hard for game so it should not have been an issue since we need to downgrade fps but out of curiosity, what was the FPS at witch temperature ?

BTW I still have few parts for the V1 as well as for the V2

[audi_bhoy]

Did you swap anything inside the bolt or you just dropped it in? Cradle Velocity Reducer needs a thinner O-Ring on V2 Bolts to cycle properly.

[waltherglocksmith]

KJW V2 bolt carrier will have a lower RPM/RPS than the V1 because its heavier but half the FPS... something is definately not working correctly

yep, half the speed. There was a bad manufacturing somewhere into the kit, because there was a friction btw the bolt and the top of the mag, where the bolt meet the mag. Got some new wear onto my mag just after few shots. So I removed the kit and send it back. I found aftermarket return belts on the net, so I will keep it stock.

Did you swap anything inside the bolt or you just dropped it in? Cradle Velocity Reducer needs a thinner O-Ring on V2 Bolts to cycle properly

I didn't swap anything inside, just put the new V2 bolt kit in it. My M4 is 100% stock, no velocity reducer. I don't play game, only target shooting.