hwagan Posted September 13, 2012 Report Share Posted September 13, 2012 I've got a bomber MRP on the way is all, and I'm really inclining more and more towards the KWA system when it comes to the mags... 2 of my G&P Pmags have begun leaking (Admittedly after a year without any real maintenance and being left in a hot car, but I don't fancy diassembling them). Guessing modifying the holes or potentially the pins would be pretty much a no-go as well? Quote Link to post Share on other sites
weekenny Posted September 14, 2012 Report Share Posted September 14, 2012 Depends how far out they are. But there are probably countless other issues, like barrel/hop fitting and if the kwa bolt will fit and ride in the upper. Quote Link to post Share on other sites
kullwarrior Posted September 15, 2012 Report Share Posted September 15, 2012 That was a conscious decision on KWA's part. That and a few other key alterations to the core design ensured that the BATF would allows the product to be imported into the US. If you say changes from KSC M4.... KWA totally BS that. Aside from different material use on specific parts, the parts compatiability and dimension were design to be different. Funny thing is that WE M4 Open-Chamber is still allow in US despite having almost 100% parts compatiability with AR-15 (lower receiver, Trigger Group, bolt carrier are the only parts I can think on top of my head that will not work) Quote Link to post Share on other sites
uscmCorps Posted September 15, 2012 Report Share Posted September 15, 2012 The KSC GBBR was designed by KWA for the Japanese market and therefore would probably pass BATF standards. That said, doesn't it feature unlicensed Colt markings and therefore subject to seizure by US Customs? The KWA LM4 is also beefed up in some parts compared to the KSC counterpart. The KWA LM4 was submitted to BATF and officially approved by the BATF as legal for importation. The WE M4, G&P M4 GBB, etc never was. The logic being that large or individual shipments of the KWA LM4 will always pass through customs, whereas the other brands' GBBRs run the risk of seizure. Do those other brands get thru? Yes. But sometimes they also get seized too. Even the KSC GBBR runs that risk since it was never formerly submitted for approval even though in many ways it's almost to the same specs as the KWA regardless of how you argue it. US Customs doesn't always work in the most logical way and they're generally unreachable when you want to argue the point. Having an official sign off by them on a product prior to shipments entering the country will by and large keep the process smooth and trouble free. Quote Link to post Share on other sites
uscmCorps Posted September 15, 2012 Report Share Posted September 15, 2012 And by changes in design, I meant compared to the WA system ... since it was asked if this was compatible with the WA system (which as we all know the WA and Inokatsu systems have a lot of cross compatibility with RS uppers). Quote Link to post Share on other sites
Finbarqs Posted September 17, 2012 Report Share Posted September 17, 2012 I think on a lot of WA systems, you can use almost everything except the FCG, and the outer barrel (which can be modified)... which means, you can use buffers, buffer springs, detents, detent springs, castle nuts, barrel nuts, delta rings, front sight, grips, flash hiders, etc. without any modifications. Upper receivers require the bolt catch mod, and some require you to drill your real upper receivers... (well with colt upper receivers) Quote Link to post Share on other sites
-wigs- Posted September 24, 2012 Report Share Posted September 24, 2012 Mine comes Tuesday and I've had all the parts laying around for months so I'll slap it together and take pics. Still waiting on my 3 pack of pmags Quote Link to post Share on other sites
freon Posted September 25, 2012 Report Share Posted September 25, 2012 Mine shoots nicely but hooks to the left. Will see if I can fix it. Quote Link to post Share on other sites
akiraspeedstar Posted September 30, 2012 Report Share Posted September 30, 2012 (edited) Considering that 95% of my game time is CQB, the 14.5" barrel just wasn't cutting it. So after probably 2-3 weeks of consideration, I finally cut my inner barrel (yes the RA-Tech barrel) and removed the second outer barrel. I have to say now the overall length has been shortened 4.25" but the gun feels so small now and so easy to maneuver around corners and behind cover. Here's a quick picture... I'm thankful that KWA went with a 2 piece outer barrel, as I can now return it to the 14.5" length easily by reinstalling an OEM length barrel and putting the 2nd outer back on, which takes maybe 2-3 minutes. Edited September 30, 2012 by akiraspeedstar Quote Link to post Share on other sites
Brigg Posted October 9, 2012 Author Report Share Posted October 9, 2012 How hard was it to take off the second outer barrel piece? I had considered doing it myself but it seemed to be on there pretty good, and wouldnt budge. Did it require heating to take it of? Im assuming its the standard 14mm negative threads under there. Quote Link to post Share on other sites
-wigs- Posted October 9, 2012 Report Share Posted October 9, 2012 Mine I heated up and just used a pair of vice grips. If you care about the finish on the extension I would suggest using a towel and man power cause I scratched the ###### out of mine. Pics for good measure. Lm4 mk18 mod 1 Just got the 5 inch surefire suppressor still have to take pics. Have a ctr stock and bcm gunfighter grip on the way Quote Link to post Share on other sites
akiraspeedstar Posted October 9, 2012 Report Share Posted October 9, 2012 I used a blow torch for a couple seconds and it came off without any force at all, didn't discolor the outer barrel or anything. Also... http://www.youtube.com/watch?v=jVhAsvsciXc 1 Quote Link to post Share on other sites
uscmCorps Posted October 9, 2012 Report Share Posted October 9, 2012 I used a heat gun for a couple minutes. Only one of the 8-9 barrels I've done came off without heat and zero effort. All the others required applied heat ... and patience. Looking good Akira! Quote Link to post Share on other sites
-wigs- Posted October 10, 2012 Report Share Posted October 10, 2012 Akita did you notice any fps drop. I never had a chrono to see what it shot stock. Now I'm chronoing around 360 - 400. Quote Link to post Share on other sites
akiraspeedstar Posted October 10, 2012 Report Share Posted October 10, 2012 I was expecting a FPS reduction, though didn't really see anything significant at all. If I did lose some power then it was probably less then 5fps. Quote Link to post Share on other sites
freon Posted October 11, 2012 Report Share Posted October 11, 2012 Getting a tighter inner barrel means + fps Getting a longer inner barrel means + fps if there is enough expanding gas going into the barrel Shortening the inner barrel means -fps (small) so if you put a tighter, shorter barrel into your gun, like what Akira did, there won't be any significant FPS changes. Nice gun Akira, the KWA is loud enough without the noveske flash hider up front. I can imagine just how loud yours is with it. Definitely intimidating. (still working on my own LM4, pics to follow) I'm going going in the opposite direction with noise. Aiming to acquire a surefire suppressor and cut up a soda can to make baffles in an attempt to suppress the sound. 1 Quote Link to post Share on other sites
DangerWerx Posted October 11, 2012 Report Share Posted October 11, 2012 I was expecting a FPS reduction, though didn't really see anything significant at all. If I did lose some power then it was probably less then 5fps. Noticed in your review that you used a modded version of my valve. How much did you end up modifying? I am waiting on a Lm4 for testing and recently started work on an LM4 specific valve. Quote Link to post Share on other sites
-wigs- Posted October 11, 2012 Report Share Posted October 11, 2012 I just got the mini 55.6 sf suppressir madbul made. The front section inside has a "baffle" and its split into three "ports".i just filled the with spray foam and the noise is reduced. Before there was no difference, maybe even louder. It's still on the loud side but I'm convinced that it's more the bolt making the brunt of the noise. Filling with foam defiantly reduced the report down range. Quote Link to post Share on other sites
uscmCorps Posted October 11, 2012 Report Share Posted October 11, 2012 I've shot quite a bit suppressed on real ARs, both semi and full auto. These GBBRs are still noticeably quieter than the real thing. Put a replica suppressor on there and you could fool some RS shooters unfamiliar with airsoft GBBs. Quote Link to post Share on other sites
akiraspeedstar Posted October 11, 2012 Report Share Posted October 11, 2012 Noticed in your review that you used a modded version of my valve. How much did you end up modifying? I am waiting on a Lm4 for testing and recently started work on an LM4 specific valve. I shaved off a little from the rear of the rocket valve, not much at all, probably 2mm or less. A LM4 specific valve would be great, a lot of people would be interested in one. Quote Link to post Share on other sites
emp3ror86 Posted October 11, 2012 Report Share Posted October 11, 2012 According to my experience with KSCs, an LM4 specific valve should be the copy of the stock one with its cylinder part made thicker or thinner according to the need. Like here: Quote Link to post Share on other sites
DangerWerx Posted October 11, 2012 Report Share Posted October 11, 2012 Already working it I have a dozen or so samples of different thicknesses cut up. Trying to find a sweet spot for 330-350 fps at 75*F 1 Quote Link to post Share on other sites
kullwarrior Posted October 12, 2012 Report Share Posted October 12, 2012 I'm surprised this part is done via CNC, couldn't you do it via mold? Quote Link to post Share on other sites
DangerWerx Posted October 12, 2012 Report Share Posted October 12, 2012 I'm surprised this part is done via CNC, couldn't you do it via mold? Yes and but no.... I prefer CNC since at a small batch level, I can fund production without outside financing and hold a high degree of part accuracy. I am just 1 guy and I would like to keep it that way. I have looked into an injection molded option though. I just don't think it is feasible for how many I would need to produce and the time frame that I would need to break even. For other projects, it would make sense. Anyways, back on topic with the KWA LM4... How are the customization options out there? From what I read, grips, stocks and rail systems are covered. Are there aftermarket barrels yet? I like the Idea of playing Mr. Potato head with an LM4 to use as a base. Quote Link to post Share on other sites
akiraspeedstar Posted October 12, 2012 Report Share Posted October 12, 2012 So far RA-Tech and KM Head make inner barrels, no one has a 100% compatible outer barrel. The Guarder and other KSC made outer barrels fit with some modification. Quote Link to post Share on other sites
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