KJW M4

[steve3057]

Hello guys, ive still been having trouble with my hop up. Everyone else seems to be able to overhop bb's i cant even level mine out, ive put layers of heat shrink wrap on my lever arm with half of an AEG nub inside to give it a big nub to push down on the rubber. when i look down the barrel with the hop up on i can see the nub sticking in the barrel a good amount and the rubber is in fine shape but the spin on the bb just dosent seem to stay through the length of the barrel. I recently replaced my inner barrel with a modified G&G 6.04 TBB of m4 length and i get a little more distance out of my shots now but there is still no "hopup" even with the thing on full blast.

[t_hum]

I can honestly say.. What wobble? Before I replaced the fore grip with a RIS system that's where most of my wobble came from. That and the stock. I stripped my rifle down to the receiver without anything on it and shook it around, not a sound or movement. It seems like that is a 20 dollar waste of money.

 

I agree. There is no wobble on the KJWs Ive handled. Honestly I think RA-T saw that the pin was the same diameter on the KJW as it was on the others and so marketed it to KJW users as well. I dont think its necessary at all.

[t_hum]

I am using GREEN GAS from Ron at GB. I tested it on Friday and it was what, 65F out side. But the mag and gas were warm. I filled it inside, took it out back and chronoed it instantly.

 

I thought your username was familiar. Didnt realize you were local at first. Send me a PM and Id be more than happy to meet up and have a look over it to see if anything is amiss.

[Speed=]

I put my DBoys RIS on yesterday and it's snug as a bug. I can feel/hear a VERY slught wobble between the two receivers. As long as it doesn't get worse I'm not going to worry about it.

[slipknot1971]

I can honestly say.. What wobble? Before I replaced the fore grip with a RIS system that's where most of my wobble came from. That and the stock. I stripped my rifle down to the receiver without anything on it and shook it around, not a sound or movement. It seems like that is a 20 dollar waste of money.

 

 

did you saw the " " with supposed inside it did you????..that's why i asked!..cause searching i founded the thing and no one has talked about it....

Edited March 1, 2010 by slipknot1971

[Raven1]

@ Steve3057

 

Sent you a reply PM bro, let me know what is the best way and we'll get you sorted!

 

I also just noted that you replaced the stock KJW Inner Barrel with a tight bore. If the Hop Up Bucking end Was NOT Machined to KJW Spec the hop up Will NOT Work Properly!

 

@ OldGameFreak

 

I was with Ron all day yesterday (Sunday) on a private field using my KJW all day in 45F / 5.5C weather in the morning to later a high temp of 58F / 14.4C.

 

My gun ran fine all day, actually I was able to out range everybody but the Systema PTW that was out there and I'm running a 10.5" barrel. If your gun is new you may want to check that the seal in the BCG isn't dry. You will also want to verify that the magazine valves are not dry as well. In other words, if your valve isn't popping back after being actuated by the striker pin from the hammer then you will experience a drop in fps as there isn't the normal amount of gas to propel the BB.

 

Both t_hum and I are in the area, get a hold of Ron over at GB and let him know you need to speak with either of us and we can meet up and quickly assess what is going on with your gun.

 

@ Slipknot1970

 

That pin is NOT Needed Broh! Actually on the KJW upper receiver I would not recommend this pin as it will add more stress to that area. The 'Take Down Pin' (The FRONT Pin any Any AR Type Platform) attachment on the KJW is prone to breakage when it is exposed to lateral (side to side) movement. By using this style of pin it will actually induce cracking of the upper. You don't want this,,,

Edited March 2, 2010 by Raven1

[johnyew]

Hello guys, ive still been having trouble with my hop up. Everyone else seems to be able to overhop bb's i cant even level mine out, ive put layers of heat shrink wrap on my lever arm with half of an AEG nub inside to give it a big nub to push down on the rubber. when i look down the barrel with the hop up on i can see the nub sticking in the barrel a good amount and the rubber is in fine shape but the spin on the bb just dosent seem to stay through the length of the barrel. I recently replaced my inner barrel with a modified G&G 6.04 TBB of m4 length and i get a little more distance out of my shots now but there is still no "hopup" even with the thing on full blast.

 

Which kind of bbs are you using? Glossy or matte surface?

[slipknot1971]

@ Steve3057

 

Sent you a reply PM bro, let me know what is the best way and we'll get you sorted!

 

@ OldGameFreak

 

I was with Ron all day yesterday (Sunday) on a private field using my KJW all day in 45F / 5.5C weather in the morning to later a high temp of 58F / 14.4C.

 

My gun ran fine all day, actually I was able to out range everybody but the Systema PTW that was out there and I'm running a 10.5" barrel. If your gun is new you may want to check that the seal in the BCG isn't dry. You will also want to verify that the magazine valves are not dry as well. In other words, if your valve isn't popping back after being actuated by the striker pin from the hammer then you will experience a drop in fps as there isn't the normal amount of gas to propel the BB.

 

Both t_hum and I are in the area, get a hold of Ron over at GB and let him know you need to speak with either of us and we can meet up and quickly assess what is going on with your gun.

 

@ Slipknot1970

 

That pin is NOT Needed Broh! Actually on the KJW upper receiver I would not recommend this pin as it will add more stress to that area. The 'Take Down Pin' (The FRONT Pin any Any AR Type Platform) attachment on the KJW is prone to breakage when it is exposed to lateral (side to side) movement. By using this style of pin it will actually induce cracking of the upper. You don't want this,,,

 

 

aknowledge dude!!..good call..i was just asking about it as info....

[oldgamefreak]

@RAVEN1

 

T and I have pm'd and he will be getting ahold of me tomorrow or Thursday to meet up and he will look at it. Thank you for the quick reply!!!!

 

 

 

Also thank you for taking your time to show me this great platform!!!

 

 

[Speed=]

Wait so Raven, with the new version KJW the aftermarket tightbores won't fit anymore?

[t_hum]

I think Raven is saying if you use an AEG barrel in an KJW without modifying it to exactly the same specs as the KJW barrel the hop won't work properly.

[johnyew]

A 363mm inner barrel works best with the stock M4 length outer barrel.

 

The extension goes in place of the stock carrier counterweight. Ive attached a poor quality cellphone pic below. It works by extending the length of the carrier so that the buffer transfers the load through the carrier and into the upper receiver instead of hitting the detent pin.

 

 

'stock carrier counterweight' Could you take a picture of this part? Thanks.

[trustkill]

'stock carrier counterweight' Could you take a picture of this part? Thanks.

 

The Counterweight is the thing press-fitted into the bolt carrier. On the stock carrier the end is open and hollow.

[johnyew]

The Counterweight is the thing press-fitted into the bolt carrier. On the stock carrier the end is open and hollow.

 

Don't you mean the Extension? Isn't that suppose to replace the stock counterweight? This is where it's confusing me because the stock carrier end is open and hollow without any 'stock carrier counterweight'.

[t_hum]

Both parts are held into the carrier via a press fit. You take out the stock weight and replace it with the extension. The stock weight doesnt cover the end like the extension does. It sits inside the carrier and is visible through the slot on the top. Id take a picture but I dont have it installed and would like to avoid taking out my carrier extension.

 

I think youll get the picture when your parts arrive.

Edited March 3, 2010 by t_hum

[johnyew]

Both held into the carrier via a press fit You take out the stock weight and replace it with the extension. The stock weight doesnt cover the end like the extension does. It sits inside the carrier and is visible through the slot on the top. Id take a picture but I dont have it installed and would like to avoid taking out my carrier extension.

 

I think youll get the picture when your parts arrive.

 

I'll go back tonight and take another closer look. Thanks.

[johnyew]

Both held into the carrier via a press fit You take out the stock weight and replace it with the extension. The stock weight doesnt cover the end like the extension does. It sits inside the carrier and is visible through the slot on the top. Id take a picture but I dont have it installed and would like to avoid taking out my carrier extension.

 

I think youll get the picture when your parts arrive.

 

Have you noticed any nozzle deformation now that the buffer is striking your extension and I am guessing that the nozzle is within the receiver extension when that is happening?

[t_hum]

Im not 100% sure I follow about the nozzle being in the extension bit? I haven't noted any sort of wear throughout any testing. The forces get transferred through the carrier into the block in the upper receiver which lines up the guide rod and charging handle as well as the hop chamber.

 

I've got thousands of rounds through my gun (including several 200-300 round sustained fire test using compressed air at 125 PSI) with the part installed and nearly 7-8K total with no signs of breakage ANYWHERE on the gun.

[senators2904]

Im no hero, never was, never will be!.. anyways folks after receiving my income tax i decided to drop half on a kjw, 2 mags, green-gas, and a propane adapter, now after reading through the thread im a little worried that my chances of getting a "serialized" model could be pretty high as i did order it from airsplat... now what id like to know is if i do get one what are the known issues with these particular models if you guys don't mind schooling me. PM if you want but either way id greatly appreciate any info on the subject at hand. Thanks

[MrTreble]

I don't know if airsplat still holds serialized models being since these babies have gone out of stock and has restocked by many retailers (with new versions).

 

But if you do get a serialized one, don't panic. You will need to contact kjw regarding 3 new parts for your gun to function perfectly. The recoil buffer, recoil buffer spring, and magazine spring. Those parts will come free, but you have to pay for shipping. I recommend you go ahead and order a nozzle or two, and some rubber bands, as those will break after a good amount of use.

 

Owning a serialized KJW M4 isn't bad at all. If someone asks you what the number on the receiver means, you can tell them it's a limited edition =P

[senators2904]

I don't know if airsplat still holds serialized models being since these babies have gone out of stock and has restocked by many retailers (with new versions).

 

But if you do get a serialized one, don't panic. You will need to contact kjw regarding 3 new parts for your gun to function perfectly. The recoil buffer, recoil buffer spring, and magazine spring. Those parts will come free, but you have to pay for shipping. I recommend you go ahead and order a nozzle or two, and some rubber bands, as those will break after a good amount of use.

 

Owning a serialized KJW M4 isn't bad at all. If someone asks you what the number on the receiver means, you can tell them it's a limited edition =P

lol i like that limited addition comment... i'll most definately get those nozzles and bands while i have the funds to do it... i really dont have a desire to upgrade mine, maybe paint the fore grip, stock, and pistol grip a dark earth or olive drab. thanks for the quick reply good sir i really appreciate it.

[Raven1]

Wait so Raven, with the new version KJW the aftermarket tightbores won't fit anymore?

 

Sorry for the confusion, I speaking Only on the aforementioned AEG M4 barrel he had modified to fit.

 

The KJW has another cut that circles around the barrel that the hop up bucking 'locks' onto. The inner barrel MUST reach into the hop up bucking and rest at the correct depth; or the hop up will not work properly.

 

The After market KJW Spec barrels work as advertised,,,

 

 

 

@ Senators2904

 

Should you receive a 'Serialized' KJW M4 it is a simple matter of emailing KJ Works with a picture of your gun show casing the serial #.

 

In turn you will pay for Shipping ONLY - They send you replacement buffer, Buffer spring and a new spring for each magazine you have purchased (In your case 2) and you will be ready to rock!

 

While you are waiting for your parts to arrive (usually 4 - 6 days) and have a game to get to by all means take the gun out and play, it will be fine. As these parts are to ensure the bolt locks back everytime after the last BB is expended. Some owners of the weaker magazine spring may have noticed the BBs do not Always feed. Most how ever do not experience any feeding problems from their magazines but I would advise to change the spring out anyway as it definitely does lock the bolt back everytime!

 

Welcome broh, you are going to be happy with your purchase,,,

 

[legileg]

Does someone know where I can buy KJ mags? They are out of stock everywhere.

[senators2904]

Sorry for the confusion, I speaking Only on the aforementioned AEG M4 barrel he had modified to fit.

 

The KJW has another cut that circles around the barrel that the hop up bucking 'locks' onto. The inner barrel MUST reach into the hop up bucking and rest at the correct depth; or the hop up will not work properly.

 

The After market KJW Spec barrels work as advertised,,,

 

 

 

@ Senators2904

 

Should you receive a 'Serialized' KJW M4 it is a simple matter of emailing KJ Works with a picture of your gun show casing the serial #.

 

In turn you will pay for Shipping ONLY - They send you replacement buffer, Buffer spring and a new spring for each magazine you have purchased (In your case 2) and you will be ready to rock!

 

While you are waiting for your parts to arrive (usually 4 - 6 days) and have a game to get to by all means take the gun out and play, it will be fine. As these parts are to ensure the bolt locks back everytime after the last BB is expended. Some owners of the weaker magazine spring may have noticed the BBs do not Always feed. Most how ever do not experience any feeding problems from their magazines but I would advise to change the spring out anyway as it definitely does lock the bolt back everytime!

 

Welcome broh, you are going to be happy with your purchase,,,

thanks for the reassurance folks, you guys are awesome especially since the rest of the market for these rifles with external power sources are so unreliable and pocket breakers at that.

[oldgamefreak]

thanks for the reassurance folks, you guys are awesome especially since the rest of the market for these rifles with external power sources are so unreliable and pocket breakers at that.

 

 

I just got mine from AirSplat and it did NOT have the SN on it.