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July 28th, 2008, 13:37 | #1 |
KWA M4 CQBR - Problem Opening Upper
Has anyone had problems opening the receiver on a KWA M4? I can't take apart the receiver even after I remove both the front and rear pins. I can get the rear part of the upper receiver lose and partly opened, but then it jams. Front part of the receiver barely budges.
Any help would be appreciated. |
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July 28th, 2008, 13:41 | #2 |
Is the charging handle catching on mechbox top tabs?
Most charging handles have to be fully extended while you pull the upper forward, and then lift the handle up a bit to shimmy over the bumps on the top of the box. |
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July 28th, 2008, 13:42 | #3 |
You'll only need to remove the rear pin. The KWA M4 receivers are VERY snug , just keep applying pressure when opening.
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Various BB throwers |
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July 28th, 2008, 13:49 | #4 |
Tys
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Let me know if you find anything particular...but I had the same issues on a couple as well that came across the workbench.
Both on the disassembly and reassembly...felt like something was out of place or blocking it from closing up. Couldn't find the source of the problem...but I didn't really go looking for it either. Safx's disassembly works for split mechboxes (like CA/Dboys). The KWA M4's are very much like TM M4A1's...they "break" open. But for the life of me I couldn't get it to "break"....so I ended up removing both front and back pins to disassemble. +1 that they're snug builds! |
July 28th, 2008, 14:11 | #5 |
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Last edited by safx; July 28th, 2008 at 14:17.. Reason: Server error |
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July 28th, 2008, 14:15 | #6 |
What choo talkin' bout Willis?
The ICS and Systema PTW are the only split mech's I know of that can break open easily... and the upper receiver does not pull away from the upper mechbox, they slide out of the tight receiver cavity. I don't know if the KWA is able to break ( push the upper receiver up with the front pin installed, but all the M4's I made in the past: CA, G&P and Systema had thick mechboxes so the upper had to slide into place. TM stock abs ones barely rise over the mech's and it's only because the plastic can flex, and crack. |
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July 28th, 2008, 14:29 | #7 |
I can confirm that KWA's M4 variants will "break" open with only the rear pin removed and the front pin left to swivel.
Worked on both my KWA M4 and my buddy's M4. I found it strange though that when I put the fire select to Semi it makes it easier to crack open. Technically there shouldn't be any reason for this at all as the selector should not interfere with the movement of the upper receiver tabs. Perhaps it's a psyhosematic reaction. When closing them, definitely use caution not to pinch/break/bend the upper receiver tabs. Eventhough they're metal they could accidentally slip outside of the lower receiver and get broken off.
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Various BB throwers |
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July 28th, 2008, 14:37 | #8 |
Ahh now I see what Tyson meant.
Coolio, thanks for the info LF. I plan to get one of these in the near future. Broken tabs do suck though, I guess it's a trade off to access the mech easier. |
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July 28th, 2008, 14:39 | #9 |
Tys
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I said that it's very much like a TM...
The upper has tabs like a metal hurricane body and a TM plastic body...but the mech doesn't get installed/slid into the upper and then placed into the lower like with a hurricane body... There is enough clearance for the upper to "tip-onto"/"drop" onto the mechbox as it is installed/pinned/screwed-into the lower. The upper does not have "lips/pins"/edges/etc...at the top rear to catch into the lower (i.e. to lock the upper into the lower like a CA or Dboys body). I'm sure that you're familiar with the 2 piece TM hopup design...similar to a TM M4, picture the plastic "plate" in the lower that the lower hopup unit and the front-wired-wire guide screw into...now picture that in metal and you have a KWA M4 lower... It is odd...it's basically a metal "TM Plastic Body"...and very nicely built. There is a little flex...not plastic body flex-like...but there's a bit. There's enough clearance to get it to close up just like a TM M4...that's how I closed up the last one last week...I wouldn't go PTW-slamming ape sh*t on it...especially since it's not mine! I have some pics that I did for a review...but I've just been too busy to post them here.... |
July 28th, 2008, 14:43 | #10 |
Tys
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Safx...the KWA M4 is an extremely good build...for the cost of them, I'm not sure if I'd build myself another from scratch or just get one of them and go from there.
Shimming needs very minor tightening up, nozzles could stand swapping out to an airseal unit. I don't like the non-ported aluminum piston head. No comment yet about their upper hopup and barrel quality... |
July 28th, 2008, 14:44 | #11 |
A-56 aka Mr.Hitman
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July 28th, 2008, 14:54 | #12 | |
Quote:
Yah, hence why I sold off my last ICS. No point in building a custom gun I don't use much when I can buy the KWA shooting 400 and lipo ready, for the few times I do play outside. Looking forward to your review Tys. I read a couple from the US already— hop sucks, everything else rocks, or so they said. Some claim the front on the S-system is a Dboys. |
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July 28th, 2008, 14:55 | #13 |
alright, I got an KWA too had same problem..or at least I thought I did...
remove the back pin only. grab the carrying handle with one hand, gran the beginning of the buffer tube with another, pull very hard on the carry handle and the reciever will split. the KWA are a perfect tight fit, when you cles the gun, make sure you piston is all the way forward or the top reciever notches will damage the piston rails. cheers. |
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July 28th, 2008, 15:04 | #14 | |
Quote:
One other thing I noticed that every new KWA M4 owner should do before fielding is to check the 4 grup screws(hex screws) holding the outer barrel to the upper receiver. Make sure they're snug/tight as they have a tendancy to be a bit loose from the factory. This will manifest itself as barrel wobble.
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Various BB throwers |
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July 28th, 2008, 15:05 | #15 |
Tys
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The KWA S-system front end is so-so...I've never did like the fiber s-system handguard (dboys/KWA/otherwise). The Dboys ones are really horrible...the KWA one is ok...not a ton on flex and I suppose it's pretty stiff. Spoiled by RIS/RAS/Other front ends I guess...LOL
The KWA S-system is just like the KWA M4 in that it "breaks" open like a TM M4. I didn't take the last s-system completely apart...the guy had a game to make that weekend. The outer barrel on the KWA S-System is worth it just in itself...it's like a frick'n solid bar of metal...don't like the handguard, but the outer barrel is nice. |
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