hawaiianjuggernaut Posted October 23, 2012 Report Share Posted October 23, 2012 Hey guys, I have a Gen1 KWA g36 and I and did a complete overhaul on it, It is being as stubborn as a mule with feeding. Shooting semi, .2s go about 50ft max. FPS is super slow and hopup doesnt seem to affect anything at all. They drop right away. Full will jam/ double feed/triple feed/drop bbs out of the barrel. Heres what i got. Gearbox SHS torque motor SHS 13:1 SHS 120 Spring SHS Metal Delayer Modify ported piston head Modify piston (white) 16AWG Wiring Stock KWA Cylinder Stock KWA piston head Stock KWA AR Latch Stock KWA Spring guide Hopup: Lonex Hopup unit (Full metal it rocks, buy it if you can find it) Madbull Red bucking Angel h-Nub Stock KWA 6.04 Anyway, ive been having terrible feeding issues, i have eliminated the following as suspects: Mags: They are G&P mids that feed fine. KWA feeds fine also. Hopup: It is letting the bbs feed in fine. I took off the magazine well to inspect and the bbs have space to enter the hopup chamber before being pushed by the nozzle. The bucking is in the correct space and is not inhibiting the bbs from feeding. The adjustment wheel/bucking and nub is also working good. Delayer: It is pulling the gears back in time with space to spare RoF: Refusing to feed on semi or full. Bucking: Tried a G&P bucking (They are kinda ######, just wanted to see if the darn thing would feed) Works fine. Barrel: BBs go through it fine. Its clean Another thing that is troubling is that the FPS is not passing ~250fps (Not an exact number just my guess). Even if i feed 1 bb into the hopup chamber manually it doesn't help either. I am getting near perfect compression with the stock cylinder and upgraded o-rings. The Hop-up is functioning great I'm beginning to think that its the nozzle. I have an SHS metal one, heard it works with the lonex unit.. The KWA nozzle is still in it, i have not tried the SHS aluminum nozzle yet. Anyway the SHS nozzle looks different from the KWA one. Could it be the problem? Talked to KWA tech support and they said that the cylinder heads are usually not compatible with aftermarket nozzles. KWA Nozzle Courtesy of kwausa.com And an SHS nozzle: Heres the KWA forum place: http://kwausa.com/forums/index.php?showtopic=7712&st=20 Any help would be MUCH APPRECIATED! Link to post Share on other sites
DarkLite Posted October 23, 2012 Report Share Posted October 23, 2012 Chuck the Madbul Red rubber, they are unbeleivably ###### for feeding. Get a Prometheus Purple or PDI W-hold rubber instead, then chrono it. Link to post Share on other sites
hwagan Posted October 23, 2012 Report Share Posted October 23, 2012 I second Darklite's comment on the Madbull Red rubber, I only ever tried one once and it was so appaling I got upset and used it in thin slices to stop AR receiver wobble. About all it's good for. Link to post Share on other sites
hawaiianjuggernaut Posted October 23, 2012 Author Report Share Posted October 23, 2012 Madbull rubber isnt the problem. Tried a G&P rubber and i have the same results. Link to post Share on other sites
hawaiianjuggernaut Posted October 23, 2012 Author Report Share Posted October 23, 2012 KWA says that it might be their proprietary cylinder head... Gahhh ive spent too much on this gun. Link to post Share on other sites
FELDJAGER Posted October 23, 2012 Report Share Posted October 23, 2012 Have you checked the compression between the cylinder head and air nozzle yet? Does the nozzle move forward enough to get a good seal against the bucking? Link to post Share on other sites
hawaiianjuggernaut Posted October 23, 2012 Author Report Share Posted October 23, 2012 Yep. Im getting a good blast of air out the front of the barrel every shot. Nozzle is doing its job. Seems to be some problem with the loading part of the hopup/nozzle setup. I might try switching delayers from the SHS metal one to the blue azimuth one. Link to post Share on other sites
LordElpus Posted October 23, 2012 Report Share Posted October 23, 2012 Not sure how the KWA hop is connected to the outer barrel, but if it's anything like the TM style check the end of the outer barrel/gasblock and the hop unit. (assuming it's a twist and lock style connection) Had many a hop lug/gas block end break causing misfeeds and airseal issues. Link to post Share on other sites
hawaiianjuggernaut Posted October 23, 2012 Author Report Share Posted October 23, 2012 The block end thing seems to be working fine. It is the twist lock type of connection. The KWA hopup seems to be very similar. I had a spare marui nozzle that is very same to the KWA one and it seems to fit the same in both hopups. Link to post Share on other sites
hawaiianjuggernaut Posted October 23, 2012 Author Report Share Posted October 23, 2012 KWA Hopup: From the other side: I also uploaded a picture of the Lonex unit fitting with the magwell. It seems to fit perfectly, i dont think the magwell is causing any problems. TM Nozzle vs SHS one. There is a difference on the top of the nozzle. helps it fit the tappet better SHS nozzle vs Marui one. Notch on the top of the marui is what i think is causing the problems... I could be wrong and lastly, the Lonex unit versus the old KWA one. I do not see any significant difference between them that would hinder feeding. Dimensions are almost exactly the same. They fit the nozzles very similarly. Link to post Share on other sites
hawaiianjuggernaut Posted October 23, 2012 Author Report Share Posted October 23, 2012 I think it should note that i had the same type of issues with the KWA hopup unit. That was the whole reason i switched to the lonex. Link to post Share on other sites
DarkLite Posted October 24, 2012 Report Share Posted October 24, 2012 Take the cylinder assembly out and check thus: 1) Place the nozzle on the cylinder head, then put your finger over the nozzle and push the piston into the cylinder quickly. It should stop, not allowing you to move the piston. If not, there's an airseal issue. Link to post Share on other sites
hawaiianjuggernaut Posted October 24, 2012 Author Report Share Posted October 24, 2012 But does that affect feeding issues? The gun wont feed to save its life Link to post Share on other sites
DarkLite Posted October 24, 2012 Report Share Posted October 24, 2012 Have you checked the length of the nozzle? With the AEG fully assembled, shine a torch into the magwell and look at the nozzle through the feed tube. Fire a shot or two in semi and try and see how far back the nozzle goes, and how far forwards it goes into the hop-up unit. If your nozzle is too long (perhaps because KWA *fruitcage*ed their tolerances), then you won't be feeding anything. Try using a shorter nozzle. I'd recommend ELEMENT plastic airseal nozzles, they're cheap and good, and plastic nozzles are less likely to bind in hop-up units or deform bbs. Link to post Share on other sites
hawaiianjuggernaut Posted October 24, 2012 Author Report Share Posted October 24, 2012 Thats something that is also confusing me. Taking the magwell off and shooting a few shots, it appears that the nozzle is going far enough forward, but not too far. It will push bbs through. Link to post Share on other sites
hawaiianjuggernaut Posted October 24, 2012 Author Report Share Posted October 24, 2012 Just opened up the GB, the kwa nozzle had a slow leak, installing the SHS one gives perfect seal with the cylinder assembly. will give word if the new nozzle helps the feeding problems. Link to post Share on other sites
LordElpus Posted October 24, 2012 Report Share Posted October 24, 2012 try breach loading a several bbs (gun upside down, magwell off put a bb in the hop and fire upside down) and seeing if it will fire... it mag be the mags, or the magwell Link to post Share on other sites
hawaiianjuggernaut Posted October 24, 2012 Author Report Share Posted October 24, 2012 Yeah I tried the breah loading method after installing the shs nozzle. It seems to work better now. But shooting semi with the magwell on continues double feeding. Have even tried full. Are there replacement g36 magwells? Not the m4 type? Link to post Share on other sites
hawaiianjuggernaut Posted October 25, 2012 Author Report Share Posted October 25, 2012 Alright, so this is getting more confusing by the day. The new SHS nozzle seals perfectly with the hopup, chamber it fixed a minor airleak in the cylinder/nozzle setup, BUT DEAR GOLLY IT WONT PASS 250FPS! I tried the poor mans chrono, and it wont even pierce the side of a can (Must be below 280ish) I tried loading a mag in the gun, removing the mag and then taking off the mag well and i found this: After removing the extra bbs: It seems that the reason its double feeding is because the nozzle goes too far back. Should i replace the cylinder head with a longer G36 one? Should i replace the nozzle with a different one? Link to post Share on other sites
hawaiianjuggernaut Posted October 25, 2012 Author Report Share Posted October 25, 2012 Gotta point out: The hole in the can was from my AUG, the dents around it are from the G36 Link to post Share on other sites
hawaiianjuggernaut Posted November 1, 2012 Author Report Share Posted November 1, 2012 Alright, so i ordered a new KWA Hopup unit and it works like a charm. ~400fps @ 33-35rps yeahhhh buddy xD PROBLEM SOLVED! Link to post Share on other sites
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