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| irisher |
 Posted: 01/25/2010 20:21 PM Post subject: I-15 HPA |
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Lieutenant Colonel
Joined: 29 Dec 2008
Posts: 435
385.17 Spud Bux
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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?bullet ID=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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| A rather blurry picture, I tried to show the regulator adjustment. |
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Last edited by irisher on 07/07/2010 12:29 PM; edited 3 times in total |
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| deathbyDWV |
| Posted: 01/25/2010 20:28 PM Post subject: |
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Colonel
Joined: 16 May 2009
Posts: 577
813.12 Spud Bux
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| 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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| jackssmirkingrevenge |
| Posted: 01/26/2010 1:55 AM Post subject: |
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aspiring machinist
Joined: 15 Mar 2007
Posts: 18058
32513.12 Spud Bux
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Not bad for performance and much cleaner than your previous monstrosity  shame you're using plastic BBs
btw deathbyDWV, our signatures appear to have come from the same source  
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| clemsonguy1125 |
| Posted: 02/17/2010 16:57 PM Post subject: |
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Major General
Joined: 21 Jul 2009
Posts: 1486
1475.73 Spud Bux
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The gun kinda reminds me or davidgvainis bullpup
Last edited by clemsonguy1125 on 02/17/2010 20:25 PM; edited 1 time in total |
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| maverik94 |
| Posted: 02/17/2010 19:32 PM Post subject: |
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Mandolin Man
Joined: 21 Jan 2009
Posts: 560
55.88 Spud Bux
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| Quote: | | 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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| Davidvaini |
| Posted: 02/17/2010 22:37 PM Post subject: Re: The HPA BBmg Reincarnated |
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Airsoft and BBMG Professional
Joined: 29 May 2007
Posts: 1375
1055.46 Spud Bux
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| 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/davidvainis-compact-bullpup-inline-vor tex-t14559.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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| irisher |
| Posted: 03/14/2010 16:38 PM Post subject: |
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Lieutenant Colonel
Joined: 29 Dec 2008
Posts: 435
385.17 Spud Bux
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UPDATE: I got bored and put a foregrip and a red dot scope on the BBmg. [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.
Last edited by irisher on 03/15/2010 15:13 PM; edited 1 time in total |
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| deathbyDWV |
| Posted: 03/14/2010 16:47 PM Post subject: |
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Colonel
Joined: 16 May 2009
Posts: 577
813.12 Spud Bux
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| The grip looks good. The sight is cool too. 7on1!
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| Davidvaini |
| Posted: 03/14/2010 17:09 PM Post subject: |
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Airsoft and BBMG Professional
Joined: 29 May 2007
Posts: 1375
1055.46 Spud Bux
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| irisher wrote: | UPDATE: I got bored and put a foregrip and an Acog on the BBmg. [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.
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thats not an ACOG.. looks like an standard red dot sight...
still looks good though...
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| jackssmirkingrevenge |
| Posted: 03/14/2010 23:47 PM Post subject: |
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aspiring machinist
Joined: 15 Mar 2007
Posts: 18058
32513.12 Spud Bux
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