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WE Gas Blow Back M4A1 Carbine


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Heres my latest custom job, a WE GBBR version of a Colt Slab Sides Carbine. If anyone knows a pla ce that could machine me a proper outer barrel, I would like to get in contact with them and have a pr

Heres my custom WE M733. I have a modified RS Bushmaster upper receiver as well as RS buffer tube, castle nut, stock, stock plate, pistol grip, front grips, front sight, and some various other small b

Hehehe, Im with you Hwagan. I dumped my LM4 like a bad habit a few months ago and switched back to the WE platform. Used the extra money to get myself a trademarked M16, slapped a RS A2 upper receiver

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There are only scar mags for CB, and then only thing different is a o-ring under the rubber, just chuck it when upgrading to OB, and I have seen a lot of left over molding on that piece just below the red mark, so make sure to clean the part and get a good fit before assembly.

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G&P eotech 552 fine on G39 for a thousand rounds or so, had it on my OB M4 for about 700rds now (which kicks harder than my G39 did, probably the temperature - I had the g39 in winter) and its still fine. Depends entirely on the optics of course, but this one's great :)

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jk: the magazines had no o-rings on delivery so there are none to be removed. trust me when I say it's not that. ;D

There is no visible molding excess, but i just took a scalpel and removed a small amount of plastic and no more visible scuff marks.

 

I still haven't tried shooting BBs with the damn thing yet so everything might just be fine when it comes to actual performace, it was just dome minor reflection made when emptying a lot of co2 capsules, the fun way ^_^

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was able to use my ob m4 last weekend. hop is pretty hard to set it either over hops or does not get any hop effect at all. in between games i will set the hop right then when the game starts it doesnt have hop again. so i went home pretty much ######.

 

after opening the hop again i discovered that the hop lever that pushes the hop rubber is getting stucked. so at first i replaced the two orings that acts as a bushing on the hop lever arm shaft with a thinner one thinking thats whats causing it to stick. it wasnt fixed so i tried installing the hop lever without orings at all. that pretty much solved it. as it turns out on my hop assembly it doesnt need the orings since it doesnt move left to right even if i dont put the bushings in. the bushing actually causes the lever to get stucked.

 

i can now turn the hop on or off on demand, it now shoots straight and will see this weekend if any other things will come out or cause problems.

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as i think more about it, my pdw and g36 only have one oring. and the hop assembly usually have only one side counter bored to accomodate the oring. on my open bolt kit both sides of the axles have orings. maybe there should be only one oring?

 

maybe the guys who assembled the kit in the we plant accidentaly put in the extra ring?

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I'm looking at it right now; only the right side has a recess for the o-ring in my open bolt M4 kit, and two are installed. I'll be trying it with one, though I haven't noticed it sticking. There should really be a second screw on the top of the chamber holding it together.

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I noticed while testing my M16 that the hop was great for a few rounds and then would drop on both auto and semi. I have now removed both o rings and the barrel is more stable and hopefully my hop will be better as you guys have found.

I'll test it later in the week when I have some decent range to shoot over

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ill be putting one oring back as i now think its supposed to be there cause there is a recess on one side of the hop assembly. one screw holding the hop assembly together is more than enough since it will slide fit in the upper receiver anyway that alone will hold the hop together.

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<!--quoteo(post=1937285:date=Nov 10 2008, 10:29 AM:name=Magsz)--><div class='quotetop'>QUOTE (Magsz @ Nov 10 2008, 10:29 AM) <a href="index.php?act=findpost&pid=1937285"><{POST_SNAPBACK}></a></div><div class='quotemain'><!--quotec-->The steel parts are probably parkerized which is why you're seeing the difference in finishes. If a gun had all of its metal parts finished in the same color i would be a little confused. (unless of course you duracoated, keracoated, alumahyderized the entire thing). <img src="http://www.arniesairsoft.co.uk/forums/public/style_emoticons/<#EMO_DIR#>/happy.gif" style="vertical-align:middle" emoid="^_^" border="0" alt="happy.gif" /><!--QuoteEnd--></div><!--QuoteEEnd-->

 

Good point, it's starting to grow on me (the whole thing not just the grey) but the real AR15 I shot certainly didnt have any grey in it. (It was an Oly Arms PCR97) anywhere. Then again it was kind of an oddball rifle anyways <img src="style_emoticons/<#EMO_DIR#>/smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" /> (Full length AR15 with collapsible stock <img src="style_emoticons/<#EMO_DIR#>/biggrin.gif" style="vertical-align:middle" emoid=":D" border="0" alt="biggrin.gif" />).

 

I'd definetly like to see what the 30shot spread is with both barrel lengths. Even if I had to use the short inner barrel with the M4 outer I'd probably do it because I dont know if I'd ever fully like the stubby look with the detachable carryhandle. Thought about making a 733 out of it but I'd rather have the full length M4. I wonder what could be done to limit the FPS while still providing the awesome blowback on these! Leaky mags do worry me a bit but then again, what gas mags dont leak stock <img src="style_emoticons/<#EMO_DIR#>/smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

 

NPAS, no reduction in blowback as far as I've felt, that is with the old closed bolt though.

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I experienced issues with my hop on my M16-A1. the first couple of shots the hop was fine but after a burst or more single shots the hop started having no effect .

I shaved of about half a mm off the front of the nozzle . This seems to have solved the issue as it appears the nozzle was forcing the BB past the hop nub when it returned to battery under recoil

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I experienced issues with my hop on my M16-A1. the first couple of shots the hop was fine but after a burst or more single shots the hop started having no effect .

I shaved of about half a mm off the front of the nozzle . This seems to have solved the issue as it appears the nozzle was forcing the BB past the hop nub when it returned to battery under recoil

 

Yup that's it, http://tw.myblog.yahoo.com/frogman-myblog/article?mid=10305 :)

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After finally been able to test the damn thing after I installed my OB-kit on my M4 I really just have to say; wow.

Straight as an arrow and quite awesome reach. After setting sighs I'm able to get repeated multiple hits on 70m, with like one flyer/dipper out of 15-20 shots.

 

But (there's always a goddamn but with WE it seems ;PPP), suddenly I'm only able to get like 25 shots out of a CO2 capsule ... not even one goddamn magazine :/ With CB-kit I could often get two magazines worth of pewpew per capsule and even tho OB seems a bit more thirsty for propellant this is ridiculous ;P

The ROF is quite slower compared when it had the CB-kit, and it's almost as if the bolt has some trouble seating in it's forward position when the nozzle travels over the magazine seal.

 

Any tips&tricks here? ^_^

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I noticed the same thing with CO2--every mag still had rounds left when the capsule was empty when I used to get two full loads with gas left over. Thought it was just the last of my mags springing leaks.

 

I'm also seeing far more fliers on auto.

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