Jump to content
Sign in to follow this  
Donut

KJW M4

Recommended Posts

I know someone has converted this platform into a dmr with a longer inner and outer, does this rifle take aeg front ends? Or does anyone know which outer barrel is compatible with this rifle? I am thinking of getting another one of these and making a dmr out of it.

 

Again sorry for posting when I should be searching but the search feature on this forum is terrible with the 4 letter minimum word requirement.

Share this post


Link to post
Share on other sites

AEG outer barrels take minimal modification in order to work, simple as taking the AEG barrel and cutting it to be the same shape as your KJ barrel with a Dremel.

Inner barrels are sold by both T_Hum here on the boards and RA Tech. Making a DMR out of these guys is simple with a small bit of elbow grease :).

Share this post


Link to post
Share on other sites

I seem to remember reading in the thread that some brands are easier to mod (closer to the KJ barrel) than others. I can't remember which ones though.

Share this post


Link to post
Share on other sites

AEG outer barrels take minimal modification in order to work, simple as taking the AEG barrel and cutting it to be the same shape as your KJ barrel with a Dremel.

Inner barrels are sold by both T_Hum here on the boards and RA Tech. Making a DMR out of these guys is simple with a small bit of elbow grease :).

 

Very true. I made a SPR Mk12 Mod0 out of mine with a T-Hum M16 length TBB. I didn't keep it like that for long though, I never did the research to see how to keep it semi auto only.

Share this post


Link to post
Share on other sites

Very true. I made a SPR Mk12 Mod0 out of mine with a T-Hum M16 length TBB. I didn't keep it like that for long though, I never did the research to see how to keep it semi auto only.

 

I had a quick look at semi auto carriers for real ARs and it looks like it might be possible to make the KJ semi only by filling down the underside of the rear of the carrier enough that it doesn't trip the auto sear. The selector switch would still be able to go into the auto position to move the auto sear into position for auto fire so if you had two bolts you could go from low fps auto to high fps semi just by changing the bolts around.

 

... or have i gotten confused somewhere?

Share this post


Link to post
Share on other sites

I'm having an issue with my magazines venting as I shoot. It sounds quieter and affects my gas efficiency. I took the gun apart and cleaned and lubed everything last night, and today it was working much better. It was louder, the blowback was as crisp as it was when I first got it, and it was just shooting better overall. But after a few mags worth of BBs, it started venting gas around the bolt again. Has anybody had this issue and know a way to prevent it from happening?

Share this post


Link to post
Share on other sites

I think I had that problem when I first got my gun. What I did to rectify it, T Hum mentioned using a silicon based grease called "Super Lube". I bought some from the local hardware store and smeared it on the piston seal and piston, and inside the cup. It seemed to do the trick.

Share this post


Link to post
Share on other sites

I had a quick look at semi auto carriers for real ARs and it looks like it might be possible to make the KJ semi only by filling down the underside of the rear of the carrier enough that it doesn't trip the auto sear. The selector switch would still be able to go into the auto position to move the auto sear into position for auto fire so if you had two bolts you could go from low fps auto to high fps semi just by changing the bolts around.

 

... or have i gotten confused somewhere?

WA selector can be modified to Semi auto as with WE, since KJW uses AR-15 selector system it should work.

Share this post


Link to post
Share on other sites

WA selector can be modified to Semi auto as with WE, since KJW uses AR-15 selector system it should work.

 

So does this mean I can drop in a real steel ambi selector? Semi-auto, of course. Anyone done it yet?

Share this post


Link to post
Share on other sites

You guys think this SPR D-Boys front end would fit?

 

http://www.airsoftgi.com/product_info.php?products_id=5719

 

Check out the larger photo, from what I remember when Ive taken my gun apart the inner barrel looks very similar. No delta ring, at least not the same type as on the stock KJW m4 but looks like it would fit.

 

How say you?

Share this post


Link to post
Share on other sites

You guys think this SPR D-Boys front end would fit?

 

http://www.airsoftgi.com/product_info.php?products_id=5719

 

Check out the larger photo, from what I remember when Ive taken my gun apart the inner barrel looks very similar. No delta ring, at least not the same type as on the stock KJW m4 but looks like it would fit.

 

How say you?

 

It requires minor modification to the barrel, but thats the exact kit I put on my KJW.

Share this post


Link to post
Share on other sites

It requires minor modification to the barrel, but thats the exact kit I put on my KJW.

 

Thank you so much for confirming that, I am anxious to start building this monster. Whats the longest inner barrel available, I dont want it to just look like an spr but function more like one, longer inner barrel and more accuracy that is. I know RA Tech only makes a 363mm one, thats the one I have in my existing KJW M4, and a cqb 250 something. How long is the one t_hum makes? and since you've already done this how much of the outer does the long inner fill up? Does it go all the way to the flash hider? Also what kind of accuracy are you experiencing? What weight bbs?

Share this post


Link to post
Share on other sites

Thank you so much for confirming that, I am anxious to start building this monster. Whats the longest inner barrel available, I dont want it to just look like an spr but function more like one, longer inner barrel and more accuracy that is. I know RA Tech only makes a 363mm one, thats the one I have in my existing KJW M4, and a cqb 250 something. How long is the one t_hum makes? and since you've already done this how much of the outer does the long inner fill up? Does it go all the way to the flash hider? Also what kind of accuracy are you experiencing? What weight bbs?

 

T-Hum can make you any length barrel that Madbull produces. I had a 503mm one (which is M16 length). It stuck out from the flash hider a couple millimeters, so I put an OPS suppressor on it.

Share this post


Link to post
Share on other sites

I can really make it any length you want. They go in the lathe for the modifications so I cant cut them to length in a flash as well. Longest I can go is 530mm and certainly anything shorter than that.

Share this post


Link to post
Share on other sites

Since I don't order from the states, I'm going to make my PDI barrel to fit. First I'll try with a deepfire.

I recon my M4 starts to shoot better and better, I don't know how... I bought it and it was like pure ######. Now, 1k rounds later, it shoots like a dream! Nice recoil, nice sound, nice range. It deffinately needs some shooting in.

Share this post


Link to post
Share on other sites

So I have been bitten by the GBB bug again, which has me wishing I had never sold my KJW M4... hindsight aside, can I get a run down of what is new for the latest KJW? By new, I mean does this rifle now come with plastic receivers etc. I purchased mine shortly after the original 300 serial numbered units had finished beta, and most all fix-its had been employed. Is the new KJW still the most reliable platform on the market? Or has the quality and reliability slipped in the last 6-months?

Share this post


Link to post
Share on other sites

Since I don't order from the states, I'm going to make my PDI barrel to fit. First I'll try with a deepfire.

I recon my M4 starts to shoot better and better, I don't know how... I bought it and it was like pure ######. Now, 1k rounds later, it shoots like a dream! Nice recoil, nice sound, nice range. It deffinately needs some shooting in.

 

If you feel up to the task, go for it. Though I will say its going to be a real chore without a lathe. Im not saying that to garner business but because it is a operation that demands precision.

Share this post


Link to post
Share on other sites

By any chance, would the current M4 come with a rear sling mount at the buffer tube like it's CQB version?

 

Nope... you have to order the sling plate from kjw directly. Or you can put a stock on it with some other sling mount. I currently have a ubr and the qd on the ubr works wonders

Share this post


Link to post
Share on other sites

Guys, do you know if i can buy a CQBR length or even shorter outer barrel for KJ M4?

I asked Ratech but i have no reply yet.

I know that you can modify an AEG barrel but i have no tools for that job.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×

Important Information

By using this site, you agree to our Terms of Use and the use of session cookies.