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BBs falling out of the gun, mag o-ring and more...


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#1 name.temp

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Posted 29 June 2013 - 01:19 PM

Hi!

I recently bought an MP7 from RWA and it's a really neat gun, hence me buying it. There are a few problems I'd like advice on, though.

Firstly, I've noticed the occasional BB falling out of my barrel when having fired a burst on full auto. It's not really a huge issue and it doesn't always happen, but I'm wondering if it can be fixed. The falling BB seems to be in relation with the muzzle pointing a bit downward while firing.

I've also been seeing people with swollen buckings. I came prepared and bought a bottle of Abbey Brut Sniper gas, which doesn't contain any lubricants. I use a lubricated gas every 5 mags or so just to keep the gun in shape between cleaning sessions. However, the Brut Sniper gas sometimes spits all over in the filling valve and blows out the o-ring. Sometimes it fills the mag nicely. The o-ring is easy to stuff back in granted I don't lose it, but the real problem is:

The magazine seems to take in a lot more of the lubricated gas, with one fill giving me almost 3 mags of shots whereas the Abbey gas, whether or not filling nicely, only gives about 1 and a half to 2 mags of shots. What's up with that?

Then there's the magazine wobble. Yes, although many people have claimed it doesn't wobble, mine does. It stays there so it's far from being a problem but hey, how come?


Oh, and one more thing for those who own the acclaimed VFC mock suppressor for the KSC/KWA MP7.
The thing is humbug. It won't bite the included flash hider properly and can be detached with ease by pulling just a little.The removal is even easier if I twist it a bit which makes the crescent attaching thing to pop out of the groove.
Attached File  QD.JPG   180.75K   6 downloads

The Umarex bullcrap only needed water to remove, props for Vega Force on that, but the other trades are RUBBING OFF JUST BY TOUCHING THEM. That, and then there's the little ring thing concealing the foam and whatnot behind the cap. It's loose. It rattles and blocks BB path. The cap is supposed to be just screwed on but damn it's on there tight.

That's not all, folks! The included flash hider is not as fat at its base as the stock flash hider, allowing the inner barrel to wobble around while firing. This, methinks causes BBs to spread uncontrollably. Some BBs even downright drop after 75 feet or so.

Ordered overseas = No refunds I guess. Well, I'll have to see what I can do by myself.

The gun overall is on par with what I had come to expect and the suppressor looks great on it, even with the dimmed trades on there. Also bought an ACOG red dot replica (defect, BTW) which looks great with it. Yes, an ACOG.

Attached File  IMG_0015.JPG   120.17K   16 downloads

Edited by name.temp, 30 June 2013 - 07:12 AM.


#2 tales

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Posted 29 June 2013 - 02:42 PM

Ok, i just tried two mags twice. Full auto no BBs fell out. Both mags 20rd & 40rd have a side to side "Wobble" maybe 1mm the most. i won't conceder that a wobble, I would say it has a tight fit with very little movement. IMO, is needed.

I use Lubricated gas, and get around 1-1/2 - 1-3/4 mags per full 20 & 40rd Mags.

As for the VFC mock suppressor I dont know, in this pic you can see KWAs MP7 adapter, try that along with a blowtorch to remove the flash hider that came with the gun.

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#3 name.temp

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Posted 30 June 2013 - 07:09 AM

The mag is okay, as long as it's not the cause for dropped BBs or those stray shots that don't seem to have been affected by hop-up. The stray shots in question actually happen with the stock flash hider as well. There is also double feeding present. Maybe 3-5 double feeds with every mag. I'll try only running the Abbey gas and see if it helps. I will also experiment with different BBs. When I got the gun I first used .28s, which I think didn't double feed unlike the .25s I'm using now. Both are G&G Biodegradables. The .28 BBs did drop though.

I did get the stock flash hider off by simply screwing it with a little stick through the birdcage. It didn't have any glue on as far as I can tell. By included flash hider I meant the one that came with the fake suppressor. I contacted the retailer about the mock suppressor with some pictures. Might as well post a few of them here.

Thanks for the reply!

#4 tales

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Posted 30 June 2013 - 08:07 AM

My son shoots .25s with all his guns. The MP7 works fine with a bunch of "different" BB brands  

There are two flat sides on the flash hider this is for a wrench of your choice, open end or adjustable (shifting Spanner?)

I know a stick wont work & if i try a thick Allen wrench, it will break the birdcage.

Will they replace the gun?

#5 name.temp

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Posted 30 June 2013 - 11:13 AM

Well, my MP7 unlike those sold in the US didn't have glue so the stick method worked fine. I did heat it up with a hairdryer just in case there was loctite in there.

I think you could try the hairdryer for about 10 minutes or do like everyone else and dip it in boiling water. Don't try to force it open as that may damage the gun.

#6 tales

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Posted 30 June 2013 - 10:00 PM

Actually it was given to me, Airsoft guns are illegal in NYC, So i don't want to make things worse if i get stopped by NOT having a orange flash hider.

I don't think boiling water will remove them. Thats like 200º it will take over 400º to remove it. No doubt if i wanted it removed we have a full blown metal shop at work. I can remove it in a few minutes.

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Edited by tales, 30 June 2013 - 10:02 PM.


#7 name.temp

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Posted 01 July 2013 - 02:44 AM

Oh, my bad. I thought you were asking for advice on how to remove the flash hider.

Anyway, if anyone who reads this has an explanation on how a swollen hop-up bucking can cause double feeding I'd appreciate hearing it.

I think I wet my bucking even though I tried not to. I can't see any other reason for the dropping BBs. No more Cybergun gas for my MP7.

As for the double feeding I'm wondering I might have cycle problems with the bolt. It is properly lubed and cleaned only recently though so I don't know.

#8 tales

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Posted 01 July 2013 - 06:32 AM

The KWA adapter is screw on (both ends) it looks like it would be a tight fit.

The BBs dropping, sounds like the same problem i had with my UPS until i replaced the bucking.

MP7 is a great gun, i hope you get it to where you are happy.

Good Luck!

#9 name.temp

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Posted 01 July 2013 - 10:40 PM

The amount of dropping BBs and double feeds seems to be decreasing. Could this be a matter of the gun breaking in or simply the hop-up bucking drying?
The mag o-ring also hasn't popped out in a while.

#10 Outlaw1995

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Posted 13 July 2013 - 06:48 PM

View Posttales, on 30 June 2013 - 10:00 PM, said:

Actually it was given to me, Airsoft guns are illegal in NYC, So i don't want to make things worse if i get stopped by NOT having a orange flash hider.

Hence my name, Outlaw. ;)

The problem of bbs falling out usually has to do with the hop up either set to low, or the fact that the gun still needs to break in... try shooting another 1000 or so rounds through the gun, see if anything changes. If not, adjust the hop up slightly. The bb is probably not receiving enough contact with the bucking so it falls through.




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