Yeager Posted December 21, 2006 Report Share Posted December 21, 2006 OK, this thing is starting to ###### me off.. I've had this problem for as long as I've had the gun, I've replaced everything internally with systema and CA brand parts. But I see no improvement. It only shoots 25 feet and when the hopup is making any kind of contact with the bb it jams. I've also replaced the stupid hopup, but it still dosen't work! Anyone have absolutely ANY idea whats wrong with this POS? Link to post Share on other sites
Ascendance610 Posted December 21, 2006 Report Share Posted December 21, 2006 is it making a nice sound when it shoots or is it like a hollow sound? Link to post Share on other sites
Yeager Posted December 21, 2006 Author Report Share Posted December 21, 2006 is it making a nice sound when it shoots or is it like a hollow sound? <{POST_SNAPBACK}> Sounds like any other AEG when it shoots, running a guarder SP90 spring and can't even put a ding in a coke can.. Link to post Share on other sites
cllwayzata2011 Posted December 21, 2006 Report Share Posted December 21, 2006 Bad air seal maybe? Something wrong with the nozel causing the jams? When you tried a different hop up did you use the same bucking? Link to post Share on other sites
Yeager Posted December 21, 2006 Author Report Share Posted December 21, 2006 Bad air seal maybe? Something wrong with the nozel causing the jams? When you tried a different hop up did you use the same bucking? <{POST_SNAPBACK}> Brand new everything.. the seals are absolutely fine, I tried them myself.. Hopup and bucking were both replaced, so its not the bucking for sure.. I'm considering parting the damn thing out, its been such a pain in the *albatross*.. Link to post Share on other sites
cllwayzata2011 Posted December 22, 2006 Report Share Posted December 22, 2006 Wow, I don't know what to tell you then. If you decide to part it out let me know Link to post Share on other sites
zentaurus Posted December 22, 2006 Report Share Posted December 22, 2006 I've had this problem for as long as I've had the gun, I've replaced everything internally with systema and CA brand parts. But I see no improvement. <{POST_SNAPBACK}> seems like a bb loading problem. too late now but, maybe, you should have checked the interfacing between the mag and the feed tube, the nozzle, and the hop up b4 buying new parts. experienced this when i modded an mp5J into a K and expoxied the body shell to get structural strength. bollixed the clearances enough to f***k up bb feeding and the thing would just dribble bbs. the jamming, imo, is another clue. probably getting two or three bbs feeding almost simultaneously but not fast enough to double feed nor slow enough to misfeed. i'd check the feeding sequence if i were you. makes sense? Link to post Share on other sites
Yeager Posted December 22, 2006 Author Report Share Posted December 22, 2006 seems like a bb loading problem. too late now but, maybe, you should have checked the interfacing between the mag and the feed tube, the nozzle, and the hop up b4 buying new parts. experienced this when i modded an mp5J into a K and expoxied the body shell to get structural strength. bollixed the clearances enough to f***k up bb feeding and the thing would just dribble bbs. the jamming, imo, is another clue. probably getting two or three bbs feeding almost simultaneously but not fast enough to double feed nor slow enough to misfeed. i'd check the feeding sequence if i were you. makes sense? <{POST_SNAPBACK}> Bbs load and feed fine, the hopup is in contact with the gearbox and airnozzel chambers a bb every time I pull the trigger, It only jams when the hopup is turned on, I basically get either very little to no hop up affect or it jams and bbs roll out the barrel.. Link to post Share on other sites
ryn1523 Posted December 22, 2006 Report Share Posted December 22, 2006 If you replaced the cylinder head, were you sure to use a long one, like the AUG? I had the same problem with a standard cylinder head, then noticed how much shorter it was in comparison to the original STAR. Link to post Share on other sites
Yeager Posted December 22, 2006 Author Report Share Posted December 22, 2006 If you replaced the cylinder head, were you sure to use a long one, like the AUG? I had the same problem with a standard cylinder head, then noticed how much shorter it was in comparison to the original STAR. <{POST_SNAPBACK}> could be the problem with there.. Any idea where I can find an AUG cylinderhead? Link to post Share on other sites
Noodle_2000 Posted December 22, 2006 Report Share Posted December 22, 2006 Here... http://www.evike.com/Merchant2/merchant.mv...&Category_Code= http://www.evike.com/Merchant2/merchant.mv...&Category_Code= I'll see if my friend will give you one for free. Gary B. Link to post Share on other sites
cllwayzata2011 Posted December 22, 2006 Report Share Posted December 22, 2006 Oh yeah that could be the problem. Since the volume of the cylinder has to be equal to or greater than that of the barrel. Find the radius and length of your barrel, then do Pi*Radius squared*length. Do the same with the cylinder and see if they are at least equal. Basic math stuff you know After that do find the volume of the AUG cylinder. That way you won't waste money if it doesn't work Link to post Share on other sites
Yeager Posted December 22, 2006 Author Report Share Posted December 22, 2006 Oh yeah that could be the problem. Since the volume of the cylinder has to be equal to or greater than that of the barrel. Find the radius and length of your barrel, then do Pi*Radius squared*length. Do the same with the cylinder and see if they are at least equal. Basic math stuff you know After that do find the volume of the AUG cylinder. That way you won't waste money if it doesn't work <{POST_SNAPBACK}> We're talking about the cylinder head.. not the cylinder itself.. thanks anyways though. STAR must have monkies or some lesser form of life building their gearboxes, because my UMP came with a full "nocap" cylinder and a cylinderhead that isn't worth a ######. I had a Systema Mp-5K cylinder & a ver 3 metal head in it which should be addiquate for the short barrel length (100-150mm Estimated) but it seems that it does indeed do better with the stock fullcap cylinder than the 5K or standard M4 cylinder that I also tried. Link to post Share on other sites
cllwayzata2011 Posted December 22, 2006 Report Share Posted December 22, 2006 Whoops. Heh. I must be tired Link to post Share on other sites
uscmCorps Posted December 22, 2006 Report Share Posted December 22, 2006 If you do plan on getting rid of it, may I suggest you look into buying the G&G UMG as a replacement? I bought mine from AEX several weeks ago, used it in a couple CQB games since and I just love it! It's been a consistent performer and when comparing it to a real steel one at Shot Show, I found it looks and feels closer to the RS than the STAR UMP. I can't recommend it enough. Hope you can fix your UMP though. Link to post Share on other sites
Yeager Posted December 22, 2006 Author Report Share Posted December 22, 2006 If you do plan on getting rid of it, may I suggest you look into buying the G&G UMG as a replacement? I bought mine from AEX several weeks ago, used it in a couple CQB games since and I just love it! It's been a consistent performer and when comparing it to a real steel one at Shot Show, I found it looks and feels closer to the RS than the STAR UMP. I can't recommend it enough. Hope you can fix your UMP though. <{POST_SNAPBACK}> I'm actually in negoiations right now to trade several guns for a brand new G&G UMP with a scad of acessories.. the only putoff is the stupid fake *albatross* trades. Link to post Share on other sites
Anatonic Posted December 22, 2006 Report Share Posted December 22, 2006 Mate I've had exactly the same problem - 180FPS and they practically roll out of the barrel... Still trying to solve it myself - but I reckon it's a cylinder problem causing a bad seal. The cylinder is actually ported as well purely because of the barrel length, but one day the whole thing just collapsed on me and now I can't get it back upto 328fps (even though it was fine for ages). *sigh* Link to post Share on other sites
HKG36 Posted December 22, 2006 Report Share Posted December 22, 2006 Well look at this way G&G has functional bolt catch and working cocking handle while the Star doesn't, besides the Star UMP trades are inaccurate unless you got one of the newer ones. Link to post Share on other sites
uscmCorps Posted December 22, 2006 Report Share Posted December 22, 2006 I'm usually a real stickler about trades, but when it came to the UMG, I just wanted something I could depend on and looked and felt accurate enough. And yeah, the bolt catch ROCKS!!! Link to post Share on other sites
Yeager Posted December 22, 2006 Author Report Share Posted December 22, 2006 Mate I've had exactly the same problem - 180FPS and they practically roll out of the barrel... Still trying to solve it myself - but I reckon it's a cylinder problem causing a bad seal. The cylinder is actually ported as well purely because of the barrel length, but one day the whole thing just collapsed on me and now I can't get it back upto 328fps (even though it was fine for ages). *sigh* <{POST_SNAPBACK}> I'm usually a real stickler about trades, but when it came to the UMG, I just wanted something I could depend on and looked and felt accurate enough. And yeah, the bolt catch ROCKS!!! <{POST_SNAPBACK}> My gun is one of the few original kits that came through, and I can find no innaccuracies in the trades other than "STARAIRSOFT VA" while comparing it to my buddies USC. Got it second hand, Gearbox thats in it came from my old doner STAR G-36K with an AUG cylinderhead. I put the old head and cylinder back in and now it shoots 100 feet, but beyond that mark the bbs just drop straight down when they should be "floating". I suppose I could use this gun for CQB in this configuration.. but I'd love to make it my primary in woodland. So I figgure that its the airnozzel and cylinder making a bad seal with the piston. *sigh* if anyone wants to swap an AUG cylinder head for a Systema metal ver 3 head let me know.. Link to post Share on other sites
HKG36 Posted December 22, 2006 Report Share Posted December 22, 2006 Well does it say Heockler and Koch on the side. Link to post Share on other sites
Yeager Posted December 22, 2006 Author Report Share Posted December 22, 2006 Yea, it has full H&K trades on it. Link to post Share on other sites
HKG36 Posted December 22, 2006 Report Share Posted December 22, 2006 So wait does it say Heockler & Koch on the side or Heckler & Koch. Link to post Share on other sites
Yeager Posted December 22, 2006 Author Report Share Posted December 22, 2006 So wait does it say Heockler & Koch on the side or Heckler & Koch. <{POST_SNAPBACK}> Heckler & Koch GmBhHeckler & Koch STAR AIRSOFT VA H/K UMP WARNING: Refer to Owner's Manual! Link to post Share on other sites
HKG36 Posted December 22, 2006 Report Share Posted December 22, 2006 Cool never knew that the kit had accurate trades. Link to post Share on other sites
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