Donut Posted January 1, 2010 Author Report Share Posted January 1, 2010 Just a quick question, anyone notice a decrease in gas efficiency with t_hum's parts? or am I just doing something wrong? Quote Link to post Share on other sites
t_hum Posted January 1, 2010 Report Share Posted January 1, 2010 Did you lube the piston o-ring when you installed it? Check to make sure the piston is as close to exactly centered on the carrier as possible. If it is off you'll get venting. Also, is your lower receiver broken, or not? I cant remember. Quote Link to post Share on other sites
militaryman7523 Posted January 1, 2010 Report Share Posted January 1, 2010 After reading this thread, I'm done with the WA platform and onto this one. One quick question, has anyone ordered there gun from airsplat.com before? I would be getting the gun and three extra magazines from them equaling $493.30! Thanks Quote Link to post Share on other sites
t_hum Posted January 1, 2010 Report Share Posted January 1, 2010 I picked mine up from Airsplat. Must say they did a great job handling my order. I did get a serial numbered gun though. Im not sure if they are still carrying those or not. Might be worth asking as it adds a little bit of trouble to email KJW and get new parts sent. Quote Link to post Share on other sites
Raven1 Posted January 1, 2010 Report Share Posted January 1, 2010 Just a quick question, anyone notice a decrease in gas efficiency with t_hum's parts? or am I just doing something wrong? Â 1 thing to note as well, I needed to replace my bolt cup (Part #15) at the 11,000 BB mark. Â From Propane ONLY use it had expanded to the point that gas was escaping around the o-ring seal creating a very noticeable drop in gas efficiency. Once I had replaced the part with a new one gas efficiency returned to normal with an increase in felt recoil. The factory KJW piston seal is a 'Lip' type that expands form a friction seal against the inside diameter of the bolt cup. Unfortunately the design also lends itself to tear easily and early on in the life of the seal. The o-ring design has a better, longer over all useful life span but unfortunately does not expand to seal to compensate for the increasing inside diameter of the bolt cup. How ever, the 10,000 BB mark ( or in my case, the 11,000 BB mark ) is an acceptable interval in which to replace the bolt cup. Doing the math, a typical air baller would reach that milestone at around the 3 year mark which is perfectly acceptable indeed,,, Quote Link to post Share on other sites
Kai_Wolf Posted January 1, 2010 Report Share Posted January 1, 2010 Raven, just to clearify, the bolt cup you replaced in the gun was just the O ring you installed on T hum's piston, yes? It would just be the rubber O ring you would have to replace? Or are you talking about replacing the stock "lip" cup seal all together? Just a bit confused. Quote Link to post Share on other sites
t_hum Posted January 1, 2010 Report Share Posted January 1, 2010 He is talking about part #15, the bolt cup. Quote Link to post Share on other sites
Kai_Wolf Posted January 1, 2010 Report Share Posted January 1, 2010 Oh ok, so hes refering to replacng the part if someone opts to not use the O ring piston? Or is the bolt cup not the cup seal Im thinking of. Quote Link to post Share on other sites
t_hum Posted January 1, 2010 Report Share Posted January 1, 2010 The o-ring piston replaces the cup seal. Those travel inside the bolt cup. Raven replaced his bolt cup due to wear/expansion over all those rounds. Iirc, he had poor efficiency with both the o-ring piston and the stock cup seal system at that many rounds and opted to replace the bolt cup. Quote Link to post Share on other sites
Kai_Wolf Posted January 1, 2010 Report Share Posted January 1, 2010 oh gotcha! Ty Quote Link to post Share on other sites
militaryman7523 Posted January 1, 2010 Report Share Posted January 1, 2010 I picked mine up from Airsplat. Must say they did a great job handling my order. I did get a serial numbered gun though. Im not sure if they are still carrying those or not. Might be worth asking as it adds a little bit of trouble to email KJW and get new parts sent. Â I sent airsplat a message asking them if its the newer version without the serial number. Can't wait to get my hands on this gun Quote Link to post Share on other sites
Speed= Posted January 1, 2010 Report Share Posted January 1, 2010 (edited) I messaged them about a month ago when they had them out of stock. They said all they had were serial ones but with the new shipment in I would highly doubt that they got more serialized ones in especially since there were only 250. On a similar note though airsplat has the cheapest price I could find on KJW mags. I'm ordering my KJW from ehobby tomorrow and I plan on buy 6 more mags from airsplat even though I want T hum's new mags. Â EDIT: While browsing through my local forums I came across this http://www.keystoneairsoft.com/product_inf...products_id=454 Â I know the guy who owns the store personally but I don't know him real well yet. I don't think he actually has them in stock but I'm gonna talk to him and get back to you guys. Edited January 1, 2010 by Speed= Quote Link to post Share on other sites
militaryman7523 Posted January 1, 2010 Report Share Posted January 1, 2010 I messaged them about a month ago when they had them out of stock. They said all they had were serial ones but with the new shipment in I would highly doubt that they got more serialized ones in especially since there were only 250. On a similar note though airsplat has the cheapest price I could find on KJW mags. I'm ordering my KJW from ehobby tomorrow and I plan on buy 6 more mags from airsplat even though I want T hum's new mags. EDIT: While browsing through my local forums I came across this http://www.keystoneairsoft.com/product_inf...products_id=454  I know the guy who owns the store personally but I don't know him real well yet. I don't think he actually has them in stock but I'm gonna talk to him and get back to you guys.  Thanks for the info!  But wait, T Hum is making new mags? I'm trying to catch up on this thread, but must of missed something. Thanks Quote Link to post Share on other sites
t_hum Posted January 1, 2010 Report Share Posted January 1, 2010 (edited) Yeah. We just begun development of Internals that will fit pmags and stanags. Still early phases though so I wouldn't hold off on buying kjw mags in the meantime. Edited January 1, 2010 by t_hum Quote Link to post Share on other sites
militaryman7523 Posted January 1, 2010 Report Share Posted January 1, 2010 Yeah. We just begun development of Internals that will fit pmags and stanags. Still early phases though so I wouldn't hold off on buying kjw mags in the meantime. Â That is so awesome! I can't wait to get this gun, and some of your upgrades! When this gun first came out I was worried about aftermarket support, but with your support T Hum I think this gun will rock. Quote Link to post Share on other sites
Kai_Wolf Posted January 2, 2010 Report Share Posted January 2, 2010 Yeah. We just begun development of Internals that will fit pmags and stanags. Still early phases though so I wouldn't hold off on buying kjw mags in the meantime. Â Â Gah! Though im not complaining about the stock mags, as I have had not a single problem with any of mine, this makes me sort of regret buying 7 spares lol. Hopefully by then ill have a little extra, especially since it was mentioned that the reseviors would be bigger. Big plus! Quote Link to post Share on other sites
t_hum Posted January 2, 2010 Report Share Posted January 2, 2010 You can always sell them as they will likely be cheaper than our offerings. I have no idea by how much, but cheaper. Quote Link to post Share on other sites
Speed= Posted January 2, 2010 Report Share Posted January 2, 2010 Would that be just for the parts you supply or with the assumed cost of the real steel mags? Quote Link to post Share on other sites
Donut Posted January 2, 2010 Author Report Share Posted January 2, 2010 Did you lube the piston o-ring when you installed it? Check to make sure the piston is as close to exactly centered on the carrier as possible. If it is off you'll get venting. Also, is your lower receiver broken, or not? I cant remember.Yep, I made sure to watch the video more than once when installing it. I did notice the piston wasn't fully sealing with the cylinder, so I added some teflon tape under the oring to compensate. I think there is still too much gas venting. I'm going to try getting a thicker oring and see if that might fix it. Otherwise I will try to get a new KJW piston. Â Oh yeah, I am LOVING the velocity adjuster. It works like a charm, and it's actually not too hard to replace when needed. Â Quote Link to post Share on other sites
t_hum Posted January 2, 2010 Report Share Posted January 2, 2010 (edited) Yep, I made sure to watch the video more than once when installing it. I did notice the piston wasn't fully sealing with the cylinder, so I added some teflon tape under the oring to compensate. I think there is still too much gas venting. I'm going to try getting a thicker oring and see if that might fix it. Otherwise I will try to get a new KJW piston. Â Oh yeah, I am LOVING the velocity adjuster. It works like a charm, and it's actually not too hard to replace when needed. Â Have you tried switching to the spare o-ring included in the package? If you can't find a suitable replacement I can mail you a few more. Â Â And to Speed, the price of the shells is included because they need to be modified for the valve knocker and a few other small spots. It would be great if they internals could drop into unmodified mags but the current designs employed by GIM guns just wont allow it. Edited January 2, 2010 by t_hum Quote Link to post Share on other sites
Speed= Posted January 2, 2010 Report Share Posted January 2, 2010 Well I'm curious to see how the installation process works because the one guy on our team also works for a competative firearm shop and they have old weak mags that I could get my hands on cheap. I assume you would have to take out the spring, etc. Quote Link to post Share on other sites
johnyew Posted January 4, 2010 Report Share Posted January 4, 2010 Raven1 & T-hum, Â Thanks for your offer to help me find the RS grips. Â I'll try to modify my spare AEG grip to fit the KJW and if its succesful, i'll post it here. Â Â Also, when are you going to start offering the tightbore barrels? I'm very unterested in these. Quote Link to post Share on other sites
t_hum Posted January 4, 2010 Report Share Posted January 4, 2010 Soon. I've still got a little work left to do on the site and the new videos. Quote Link to post Share on other sites
tome Posted January 5, 2010 Report Share Posted January 5, 2010 http://www.tokyo-model.com.hk/ecshop/goods.php?id=6071 Â 509mm x 6.03mm... what kind of monster fps would you get out of this i wonder :-O Quote Link to post Share on other sites
t_hum Posted January 5, 2010 Report Share Posted January 5, 2010 My custom 6.03 x 509 gave me a 25 FPS boost. Nothing phenomenal but a step up for those guys hoping to squeeze out a bit more FPS for DMRs and the like. Quote Link to post Share on other sites
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