weekenny Posted October 26, 2010 Report Share Posted October 26, 2010 I imagine it'll be the Marui piston of uppers, nice and soft plastic giving it good shock resisting properties making it practically indesructable. Lol On a related note I haven't yet had a reply from Claire on prices for metal uppers. Quote Link to post Share on other sites
PapayaSalad Posted October 26, 2010 Report Share Posted October 26, 2010 Curious, how has the plastic upper receiver been holding up. I remember seeing someone on here with one and I just wanted to know feel differences, quality of the plastic, and how it has been holding up under use. It feels like any other plastic/polymer body. My buddies upper took a dump, so it's been installed on his to test it out. There was no issues swapping all the parts (hop up, forward assist, dust cover) over. Only time will tell though how it'll hold up. I'll update if anything happens. Quote Link to post Share on other sites
t_hum Posted October 26, 2010 Report Share Posted October 26, 2010 Any pics? Quote Link to post Share on other sites
Shadow_Ocelot Posted October 26, 2010 Report Share Posted October 26, 2010 Yes, please! Pictures and show us where it's taking any wear! Quote Link to post Share on other sites
PapayaSalad Posted October 26, 2010 Report Share Posted October 26, 2010 Going to a game next weekend. I'll take pics of everything afterwards. Quote Link to post Share on other sites
ancorp Posted October 27, 2010 Report Share Posted October 27, 2010 Hey guys, Picked up a KJW M4 locally that has been disassembled and reassembled by the previous owner. It has erratic auto fire. Sometimes you can get a good burst, sometimes it short strokes, sometimes it vents. Semi runs 100% perfectly. My guess is its not properly assembled. Is it normal for the selector not be able to switch to auto when the hammer is down? I know you can't put it on safe with the hammer down, but switching from semi to auto should still work, no? It moves almost all the way, but then the gray trigger sear blocks it apparently. Regards, Alex Quote Link to post Share on other sites
Shadow_Ocelot Posted October 27, 2010 Report Share Posted October 27, 2010 (edited) It should not be able to switch into Auto when the hammer is forwards, so by all means do not attempt to force it! Edited October 27, 2010 by Shadow_Ocelot Quote Link to post Share on other sites
Mental Medic Posted October 27, 2010 Report Share Posted October 27, 2010 Hey guys, Picked up a KJW M4 locally that has been disassembled and reassembled by the previous owner. It has erratic auto fire. Sometimes you can get a good burst, sometimes it short strokes, sometimes it vents. Semi runs 100% perfectly. My guess is its not properly assembled. Is it normal for the selector not be able to switch to auto when the hammer is down? I know you can't put it on safe with the hammer down, but switching from semi to auto should still work, no? It moves almost all the way, but then the gray trigger sear blocks it apparently. Regards, Alex There could be something lodged in your fire control group. Maybe shake it out or hose it out with some water and see if it does anything? Quote Link to post Share on other sites
t_hum Posted October 27, 2010 Report Share Posted October 27, 2010 From my eariler posts on this same topic... Check the following: 1. Sticky/slow moving mag valves. 2. The orientation of the spring connected to the full auto sear. 3. Check to see that your piston cup and piston seal arent damaged Quote Link to post Share on other sites
tome Posted October 27, 2010 Report Share Posted October 27, 2010 I've read about the orientation of the spring on the auto sear a few time but don't really understand what I'm looking for. Could someone with one that's in the right place post up a pic? Quote Link to post Share on other sites
t_hum Posted October 27, 2010 Report Share Posted October 27, 2010 Cant take a pic atm but ill try to explain. The leg of the spring should sit flush with the inside of the fire control pocket. Sometimes the spring wanders towards the center of the pocket and interferes with the auto sear arm that contacts the fire selector. Quote Link to post Share on other sites
ancorp Posted October 28, 2010 Report Share Posted October 28, 2010 Everything seems fine. Mag valves are not sticky, piston is fine, trigger group seems fine. But - the striker might be the issue? I notice that moving it up and down has quite some friction. Inserting a mag with the hammer down, and then racking it results in dryfire, the striker sticks in the upper forward position. So I have to rack the bolt carrier without a magazine in there. Can someone guide me with disassembling the striker out of the lower receiver so I can inspect it and reassemble? Quote Link to post Share on other sites
Roman! Posted October 28, 2010 Report Share Posted October 28, 2010 Maybe T-Hum has a video? T-Hum makes great instruction videos. He linked me to his inner barrel installation video on you tube and I was set. Thanks again T-Hum! Quote Link to post Share on other sites
t_hum Posted October 28, 2010 Report Share Posted October 28, 2010 Thanks for the compliments. I really dont deserve nearly that much credit. I dont have a video for the lower parts disassembly. Id be happy to do one if I weren't absolutely slammed with stuff to get done. Mags for both systems and the BCGs for the WA system are consuming more time that I already have to offer. No reason somebody else couldn't do one though... Quote Link to post Share on other sites
theprodigy Posted October 28, 2010 Report Share Posted October 28, 2010 Sorry, wrong thread. Weird bowser issues. the kjw does that sometimes Quote Link to post Share on other sites
theprodigy Posted October 28, 2010 Report Share Posted October 28, 2010 Almost done, just a couple pieces left. likin it. im considering buying a cqbr to compliment the reg lenght m4. Quote Link to post Share on other sites
Roman! Posted October 30, 2010 Report Share Posted October 30, 2010 That's funny because I am contemplating buying a KJW regular length version to complement my KJW CQB model Nice setup by the way! Quote Link to post Share on other sites
weekenny Posted October 31, 2010 Report Share Posted October 31, 2010 (edited) Ok some more FPS testing 3 x freshly gassed Propane mags. Mixed weight ASG Blaster BB's 10 x 0.2's 10 x 0.25's 10 x 0.3's Results - 0.2 High 330 Low 305 Average 317 0.25 High 308 Low 285 Average 293 0.3 High 283 Low 277 Average 278 So 0.2 to 0.25 average loss 24fps 0.25 to 0.3 average loss 15fps, going by what I've seen on AEG's I'd expected a loss of 30fps for every 0.05 increase in weight. Ok so these results are not as freakishly close together as the other weeks quicky 0.2 vs 0.25 test but looking at the high vs low there was still a little cross over and interesting not much loss in average speed going from 0.25 to 0.3. Well there you have it interesting or you decide, I found it interesting lol. PS gun has been modified for under 330fps using Cradle Velocity Reducer. Edited October 31, 2010 by weekenny Quote Link to post Share on other sites
wotty33 Posted October 31, 2010 Report Share Posted October 31, 2010 Any one found a speed loader that can work with out using the kjw "slow" loader that ships with the gun? I've tried using this gun in the field a few times and it's amazing fun (that is when when i'm feeling fit enough to cart around 7 mags + all the paraphernalia for reloads) However when its time to refill the mags it's game over (or scrabble around in the mud looking for all the various small parts whilst people shoot you in face) Any one built a speed loader for the KJW m4? Quote Link to post Share on other sites
GismoBE Posted November 2, 2010 Report Share Posted November 2, 2010 Can someone please put a how-to vid online to install the NPAS? I can't imagine how to get it in and working. There is a large imbus in de bc, at about the same place as with the WA. Only difference: I can't get the imbus out... It just sits there. I turn it but it won't come out.. PLEASE help me people.. I wanna skirmish it next sunday. Quote Link to post Share on other sites
t_hum Posted November 2, 2010 Report Share Posted November 2, 2010 Which reducer are you using? Ra-Tech or Cradle? Quote Link to post Share on other sites
GismoBE Posted November 2, 2010 Report Share Posted November 2, 2010 Sorry, I forgot to mention. I'm using a RA-Tech reducer. Quote Link to post Share on other sites
t_hum Posted November 2, 2010 Report Share Posted November 2, 2010 I havent seen one of those yet. I dont think anyone on here has used one before, either. Quote Link to post Share on other sites
GismoBE Posted November 2, 2010 Report Share Posted November 2, 2010 Hmm... That's kinda bad.. I need to get it installed. Quote Link to post Share on other sites
t_hum Posted November 2, 2010 Report Share Posted November 2, 2010 Take some pictures of all the parts. Maybe all of us here can help you figure it out together. Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.