tome Posted August 30, 2012 Report Share Posted August 30, 2012 @ Shabby. the inner barrel is modified AEG Prometheus 6.03mm diameter/ 510mm lenght barrel. I am yet to test it hehehe, There are many things to consider to make this a performer sniper rifle... from the quality of inner barrel mod to increasing the power source to compensate the lenght of the barrel. It can be done by either using more powerful gas or stronger hammer spring. Hope this performs well, if all efforts are exhuasted and does not perform the way I want it, this project will be scratched. Let's see. =) Longer barrel plus more power from hammer or gas :-O doesn't a longer barrel in a gas gun already increase power quite significantly (of course this depends on how much gas is released). At least this was what I experienced with Tanaka m700 series sniper rifles. Quote Link to post Share on other sites
Cj Radge Posted August 30, 2012 Report Share Posted August 30, 2012 (edited) Longer barrel plus more power from hammer or gas :-O doesn't a longer barrel in a gas gun already increase power quite significantly (of course this depends on how much gas is released). At least this was what I experienced with Tanaka m700 series sniper rifles. Right, depends on how much gas is released. I heard from someone locally that the gas released by stock KJW M4 GBBr is just enough for the stock short barrel that came with it. So I am yet to test for myself with longer barrel tomorrow, lets see. But i can only have a concrete result when I borrow my friends chrono... maybe over the weekend. I'll keep you guys posted. I had the same experience with my gas m700 before (see my avatar) Edited August 30, 2012 by Cj Radge Quote Link to post Share on other sites
freon Posted August 31, 2012 Report Share Posted August 31, 2012 A friend and I have been playing around with barrel lengths and diameters for a stock KJW and other gbbs and we have observed the following: because we're dealing with compressed gas, tightening the barrel diameter from 6.03 to 6.01 or tighter exponentially increases the gun's power with diminishing returns. Extending the length of the barrel also increases the gun's muzzle power, up to a certain point. After that point, the gas fully expands in the space of the barrel and no longer causes the bb to accelerate. Simply tightening the barrel increased output by about 50 fps. Extending the barrel increased output by about 50 fps. Once past 365mm in length, muzzle velocity began to drop once again. What we want to test further: increasing the hammer spring tension will not raise FPS for shorter or tighter barrels but it may increase the muzzle output for longer barrels that are past the threshold of returns in the above observations. modifying the v2 bolt o-rings to increase/decrease fps may also affect thresholds. Temperature also affects this performance, but to what extent? Would it be better to have a surplus of gas volume expanding in your barrel or not? Quote Link to post Share on other sites
freon Posted August 31, 2012 Report Share Posted August 31, 2012 (edited) Glad my tutorial helped you =) Nice work on the teflon ring. Even here in my area, that washer is hard to find, I just found mine lying around the house. For those who cannot find a washer, they can just sand down the inner buffer tube, 1mm is good enough . Hell, I made my washer out of duck tape and did the same for a friend. Edited August 31, 2012 by freon Quote Link to post Share on other sites
Landa Posted August 31, 2012 Report Share Posted August 31, 2012 Would it be better to have a surplus of gas volume expanding in your barrel or not? You want to use the expanding air as much as possible, i have read countless times in gas sniper threads how excess air causes inaccuracy. What happens is the bb exists the barrel with turbulent air around it, tumbling it out of its path. In fact, there are ways to prevent this. I have seen these mock suppressors that have a bunch of little chambers inside, like the real thing, in order to channel the turbulent air away from the bb right after they both exist the barrel. Quote Link to post Share on other sites
freon Posted August 31, 2012 Report Share Posted August 31, 2012 @ Shabby. the inner barrel is modified AEG Prometheus 6.03mm diameter/ 510mm lenght barrel. I am yet to test it hehehe, There are many things to consider to make this a performer sniper rifle... from the quality of inner barrel mod to increasing the power source to compensate the lenght of the barrel. It can be done by either using more powerful gas or stronger hammer spring. Hope this performs well, if all efforts are exhuasted and does not perform the way I want it, this project will be scratched. Let's see. =) CJ, I don't think you need to screw with the hammer just yet. Remember how you fiddled with the bolt o-rings to increase/decrease fps? Set the o-ring to increase the gun's fps. You'll have more gas pushed into the barrel. From there, just figure out what FPS you want your gun to be shooting at. Quote Link to post Share on other sites
freon Posted August 31, 2012 Report Share Posted August 31, 2012 (edited) You want to use the expanding air as much as possible, i have read countless times in gas sniper threads how excess air causes inaccuracy. What happens is the bb exists the barrel with turbulent air around it, tumbling it out of its path. In fact, there are ways to prevent this. I have seen these mock suppressors that have a bunch of little chambers inside, like the real thing, in order to channel the turbulent air away from the bb right after they both exist the barrel. Landa, my thoughts exactly! With some foam and cut-outs from a soda can, I think one can make some pretty decent baffles that should increase accuracy. Sorry for the multiple posts. Been a while since I've checked these boards. Edited August 31, 2012 by freon Quote Link to post Share on other sites
Theme57 Posted August 31, 2012 Report Share Posted August 31, 2012 What I did to my kjw M4 barrel was use Teflon tape and wrapped it maybe 1 time around the inner barrel that touches the outer barrel enough for no wobble. I noticed that instead of my shots being either left to right sometimes, there were all straight but with drop due to hop. Quote Link to post Share on other sites
weekenny Posted August 31, 2012 Report Share Posted August 31, 2012 There are two hop mod guides in this thread. Quote Link to post Share on other sites
Cj Radge Posted August 31, 2012 Report Share Posted August 31, 2012 Operators using KJW M4 Gbbr and insertion using Nimbus 2012 Bling Edition (Left: Freon and me on the right) lol Quote Link to post Share on other sites
tome Posted August 31, 2012 Report Share Posted August 31, 2012 Right, depends on how much gas is released. I heard from someone locally that the gas released by stock KJW M4 GBBr is just enough for the stock short barrel that came with it. So I am yet to test for myself with longer barrel tomorrow, lets see. But i can only have a concrete result when I borrow my friends chrono... maybe over the weekend. I'll keep you guys posted. I had the same experience with my gas m700 before (see my avatar) Nice Good luck on your upgrades. Hope it all goes well, I'd totally build a marksman rifle out of a KJ m4 if the results were worth it! Quote Link to post Share on other sites
Theme57 Posted September 1, 2012 Report Share Posted September 1, 2012 You guys are making me jittery with all these self mods. I love doing nutty mods to make things work haha. Fill me in on how things go. Quote Link to post Share on other sites
freon Posted September 4, 2012 Report Share Posted September 4, 2012 (edited) What I did to my kjw M4 barrel was use Teflon tape and wrapped it maybe 1 time around the inner barrel that touches the outer barrel enough for no wobble. I noticed that instead of my shots being either left to right sometimes, there were all straight but with drop due to hop. That's a good and simple mod to do. I did it to mine too for pinpoint accuracy. There are two hop mods on this thread as stated, the simplest one is to wrap your hop-arm in heat-shrink tubing (I used duct tape) and adjust according to the bb weight you use. I use .32 black bbs and shoot at 350 fps using .2 bbs. The heavier weight bbs give me a bit more range and accuracy. As a result, I'm able to tag people at a distance that makes them say "Where'd that come from?" Operators using KJW M4 Gbbr and insertion using Nimbus 2012 Bling Edition (Left: Freon and me on the right) lol CJ, you had to show it didn't you? Nice Good luck on your upgrades. Hope it all goes well, I'd totally build a marksman rifle out of a KJ m4 if the results were worth it! My KJ, as seen above, may look like a MK18 mod 1, but it performs like a marksman's rifle. I've gotten it ridiculously accurate and shooting black bbs makes it hard for people to 1. dodge my shots and 2. see where I'm shooting from by tracing. You can get your KJs ridiculously accurate so after that, it'd just be a matter of getting the form to follow the function. lastly, KJW has released a newer version of their hop up assembly. It's more responsive to adjustment and doesn't need any mods. I'm seeing good results from mine. Edited September 4, 2012 by freon Quote Link to post Share on other sites
frogfish Posted September 4, 2012 Report Share Posted September 4, 2012 how did you get a hold of the new hop-up? Quote Link to post Share on other sites
Landa Posted September 4, 2012 Report Share Posted September 4, 2012 I need to get that too! Nothing that im doing is working with the current hop up design... no heat shrink allows me to almost backspin 0.28's perfectly in the highest setting, but if i add ONE layer, it overhops in the lowest one Quote Link to post Share on other sites
frogfish Posted September 4, 2012 Report Share Posted September 4, 2012 The TDC mod works well, but I'm willing to try new things. Quote Link to post Share on other sites
freon Posted September 4, 2012 Report Share Posted September 4, 2012 (edited) how did you get a hold of the new hop-up? I ordered it from KJW of course! Edited September 4, 2012 by freon Quote Link to post Share on other sites
Number5 Posted September 4, 2012 Report Share Posted September 4, 2012 Would be very interested to see pictures of it! And know how it differs from the original. However I am also having good results from the TDC mod! Quote Link to post Share on other sites
Kai_Wolf Posted September 4, 2012 Report Share Posted September 4, 2012 I would also like to get the new hop up unit as well. How much was it? Quote Link to post Share on other sites
frogfish Posted September 4, 2012 Report Share Posted September 4, 2012 and do you have a part number? Quote Link to post Share on other sites
Cj Radge Posted September 4, 2012 Report Share Posted September 4, 2012 CJ, you had to show it didn't you? I can't help it . lol Quote Link to post Share on other sites
freon Posted September 5, 2012 Report Share Posted September 5, 2012 I would e-mail KJW to find this information out. As for the parts, they looked similar to the original hopup and I didn't notice any changes outright. Only that the dial snapped into place more crisply as you turned it and it was more responsive. Quote Link to post Share on other sites
xxlycan Posted September 10, 2012 Report Share Posted September 10, 2012 Does anyone know if this stock would fit on the KJW M4 without wobble? http://shop.ehobbyasia.com/accessories/stocks/aeg/magpul-pts-ctr-stock-for-marui-m4-m16-black.html Also, what length rail system would fit the CQBR? Quote Link to post Share on other sites
Theme57 Posted September 10, 2012 Report Share Posted September 10, 2012 Does anyone know if this stock would fit on the KJW M4 without wobble? http://shop.ehobbyasia.com/accessories/stocks/aeg/magpul-pts-ctr-stock-for-marui-m4-m16-black.html Also, what length rail system would fit the CQBR? I use the same stock, but would recommend the one without the clamp, with some electrical tape it will fix the wobble not the clamp part of it. For the rail system I believe its a standard carbine length (7in?) Quote Link to post Share on other sites
xxlycan Posted September 10, 2012 Report Share Posted September 10, 2012 I use the same stock, but would recommend the one without the clamp, with some electrical tape it will fix the wobble not the clamp part of it. For the rail system I believe its a standard carbine length (7in?) Thank you that was very helpful. I'm really new to the world of M4s if you can't already tell, haha. Would you be able to link me to the stock you recommend by any chance? I'm not entirely sure what you mean by that. Cheers, Lycan Quote Link to post Share on other sites
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