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Mk IV QEV Popoff. Updated 22 Feb

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: SubsonicSpud » Fri May 15, 2009 10:25 pm

far_cry wrote:are you think to try the gun with higher pressure
30 bars ?
Probably not that high. I will be aiming to run it at about 25 bar max, any more than that and the air tank dose not have much usable pressure margin, The highest I can pump it to is about 40bar. With the popoff system, once the air supply drops to or below the popoff's setting it will not cycle.

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Unread postAuthor: Tony.Knaak » Sat May 16, 2009 2:08 am

I admire your skills to keep improving this design. It's pretty amazing to see how far you have taking it such a short time. The MKI photos on page one to this brass block is a huge jump in engineering.

Just curious, where did you purchase the solid brass?
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Unread postAuthor: SubsonicSpud » Sat May 16, 2009 2:47 am

Tony.Knaak wrote:Just curious, where did you purchase the solid brass?


The brass I got from a metal merchant that specialises in Copper and alloys like Brass and bronze.
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Unread postAuthor: POLAND_SPUD » Sat May 16, 2009 4:59 am

I think you should consider selling these

there shouldn't be any problems with customs because the block is not a gun but it would be so easy for buyers to convert it into a gun
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Unread postAuthor: thedeathofall » Sat May 16, 2009 6:24 pm

I second that. This is truly engineering at its finest.
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Unread postAuthor: deathbyDWV » Sat May 16, 2009 7:38 pm

So does your ammo just fall in to the barrel, no bolt or anything?
Also do you not get very many double feeds?
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Unread postAuthor: SubsonicSpud » Sat May 16, 2009 11:15 pm

deathbyDWV wrote:So does your ammo just fall in to the barrel, no bolt or anything?
Also do you not get very many double feeds?


No bolt, the magazine is lightly spring loaded to help feed the ammo. There is a small post behind where the BB sits in the barrel to stop it rolling back into the valve. There is also a spring loaded detent in front of where the BB sits, to stop it from rolling out and to prevent double feeds. There is a diagram somewhere earlier on in the thread.

I don't think I will make them to sell, the laws in Australia a pretty strict, and it would be hard to sell it as anything other than a firearm part. I would also want to find a less time consuming way of making them.

Thanks for the complements anyway :D

I think I am going to have to make it again now, because I stuffed up a hole I drilled in the QEV cover Plate :evil: :cry:

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Unread postAuthor: deathbyDWV » Sun May 17, 2009 10:30 am

Ok thanks i've been thinking about making something like this and was wondering if i would really have to make a blow forward bolt.
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Unread postAuthor: POLAND_SPUD » Sun May 17, 2009 10:39 am

I don't think I will make them to sell, the laws in Australia a pretty strict


sell it as a quick exhaust valve :wink:
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Unread postAuthor: django » Sat May 23, 2009 9:57 pm

wow!!!!!, this gun/design is simply amazing,ive only just found this thread as i'm mostly looking at the BBMG section :oops: almost finished my 9mm semi auto and after seeing this I 'll be constructing one of these ASAP! the sound and power are staggering to say the least.

seeing as my 9mm guns ammo is very expensive and the ROF on the Pop Off Valve gun seems to be quite high,im thinking of opting for a .177 version as I buy 1500 rounds of .177 Daisy bbs for $7.00 Australian so probably my best option...........
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Unread postAuthor: airheadnoob » Fri Jun 05, 2009 4:59 am

nice job just wondering we did u get the bbs im going to get some :o
did some of the bb go through the cricket bat ?
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Unread postAuthor: Carlman » Fri Jun 05, 2009 5:40 am

django wrote:1500 rounds of .177 Daisy bbs for $7.00 Australian so probably my best option...........


where??
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Unread postAuthor: django » Fri Jun 05, 2009 6:44 am

Carlman wrote:
django wrote:1500 rounds of .177 Daisy bbs for $7.00 Australian so probably my best option...........


where??


From my nearest gun shop,I have a firearms licence 8) I was lucky enough to obtain my firearms licence way back when I was 18(18 years ago) when it was a case of joining an Airgun Shooting club,getting a letter from the club and theres your licence sir..............
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Unread postAuthor: Carlman » Fri Jun 05, 2009 8:37 am

Sweet what state are you in mate, might need use of your licence...
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Unread postAuthor: django » Fri Jun 05, 2009 7:44 pm

Carlman wrote:Sweet what state are you in mate, might need use of your licence...
I dont think you'll be using MY licence mate!,Im not risking losing it for anything.Surely you know someone near you with a licence who can get the bb's for you,dont really want to say what state I Live in,as im paranoid over getting busted for my homemade guns.

I had a police scare a few years ago where they tried to entrap me online with info on blank guns,airsoft etc after I posted up on a now deleted Airsoft site,im not making this up either.the gun laws here in OZ are trully a freakin joke
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