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I-15 HPA

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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I-15 HPA

Unread postAuthor: irisher » Mon Jan 25, 2010 9:21 pm

A while back I threw together a BBmg around a HPA system. Unfortunately aesthetics were quite lacking and after some use the swivel joint on the remote snapped rendering it unsafe. I decided to completely scrap the old shell and start over.

I came up with this BBmg. It has most of the same parts as the old one but, it is a much cleaner design. This design is coaxial which allows it to be quite compact.(Not sure if this has been done before.) It is only 18 inches long. It employs an adjustable hop-up system. To counteract the leakage I have encountered from blowguns under high pressure I bought a push button valve from McMasters. The magazine cap is held on by a locking mechanism. The body is formed from melted PVC pipe and the serrated muzzle guard was made with my dremal.

I am unable to give an exact muzzle velocity but, I did try the can penetration test.http://www.redwolfairsoft.com/redwolf/airsoft/BulletDetail?bulletID=34 Judging from the fact that it penetrated the top and the continued on to penetrate the side I estimate a 650 Fps .2 BB at 700 PSI.
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Attachments
bbmg hhpa 001.jpg
The regulator used.
bbmg hhpa 003.jpg
The entire body.
bbmg hhpa 005.jpg
A rather blurry picture, I tried to show the regulator adjustment.
bbmg hhpa 007.jpg
The pierce top of can.
bbmg hhpa 007.jpg (31.72 KiB) Viewed 2859 times
Last edited by irisher on Wed Jul 07, 2010 1:29 pm, edited 3 times in total.
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Unread postAuthor: deathbyDWV » Mon Jan 25, 2010 9:28 pm

Wow now there's some power! Looks very good. I'm guessing it's a vortex? I'm pretty sure that your design has been done. If I make another I'm gonna make it with this design.
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 26, 2010 2:55 am

Not bad for performance and much cleaner than your previous monstrosity :D shame you're using plastic BBs

btw deathbyDWV, our signatures appear to have come from the same source :P ;)
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Unread postAuthor: clemsonguy1125 » Wed Feb 17, 2010 5:57 pm

The gun kinda reminds me or davidgvainis bullpup
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Last edited by clemsonguy1125 on Wed Feb 17, 2010 9:25 pm, edited 1 time in total.
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Unread postAuthor: maverik94 » Wed Feb 17, 2010 8:32 pm

The gun finda reminds me or davidgvainis bullpup
I agree, visually they look strikingly similar. Anyway, very nice work. I think your gun would benefit from a handle though. But as stated above, nice power for plastic bbs, but it would be just wicked with metal bbs!
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Re: The HPA BBmg Reincarnated

Unread postAuthor: Davidvaini » Wed Feb 17, 2010 11:37 pm

irisher wrote:AThis design is coaxial which allows it to be quite compact.(Not sure if this has been done before.)


Yes, it has been done before... here is the first example shown online:

http://www.spudfiles.com/forums/davidva ... 14559.html

clemsonguy1125 wrote:The gun kinda reminds me or davidgvainis bullpup


Yes, my bull-pup coaxial BBMG looks very much like this one.. though it looks like he spent more time with it.

anyway, good job mate!
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Unread postAuthor: irisher » Sun Mar 14, 2010 5:38 pm

UPDATE: I got bored and put a foregrip and a red dot scope on the BBmg. [img][img]http://i40.tinypic.com/hukdci.jpg[/img][/img]
The sight was surprisingly accurate. It was so good my friends have now banned it from use unless it is 7 vs 1.
8)
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Last edited by irisher on Mon Mar 15, 2010 4:13 pm, edited 1 time in total.
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Unread postAuthor: deathbyDWV » Sun Mar 14, 2010 5:47 pm

The grip looks good. The sight is cool too. 7on1!
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Unread postAuthor: Davidvaini » Sun Mar 14, 2010 6:09 pm

irisher wrote:UPDATE: I got bored and put a foregrip and an Acog on the BBmg. [img][img]http://i40.tinypic.com/hukdci.jpg[/img][/img]
The sight was surprisingly accurate. It was so good my friends have now banned it from use unless it is 7 vs 1.
8)


thats not an ACOG.. looks like an standard red dot sight...

still looks good though...
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 15, 2010 12:47 am

Davidvaini wrote:thats not an ACOG...


Yup, no bible verseseither :roll:
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