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finally built one

Posted: Mon Dec 29, 2008 3:44 pm
by grock
well, with a lot of help from Neospud and looking around here for a while, i finally stopped procrastinating enough to build me a bbmg. i built it in a bullpup config because half the reason was to use it in cqb situations. i threw on a stock that i ripped off an crappy m4 with a busted piston. all i need to do now is get a grip to go over the existing one, and replace the zip-tie with something that is less ridiculous looking. questions, comments, concerns, advice?

Posted: Mon Dec 29, 2008 4:25 pm
by Mateo
nice lookin gun. is it a vortex or what?

Posted: Mon Dec 29, 2008 4:42 pm
by grock
yah, its a vortex.

Posted: Mon Dec 29, 2008 4:50 pm
by Floyd
Why dont you just cut of the tail of the zip tie as it is doing nothing but making it look ridiculous. You could replace it with a hose clamp covered in electrical tape or something of the sorts.

What are you using as your air source? Looks like fun. Any estimate on the ROF?

Nice bbmg.

Posted: Mon Dec 29, 2008 5:03 pm
by grock
im usin a paintball tank hooked up to a cobalt co2 reg. the zip tie is only there until i can go to homedepot and get me a hose clamp, because i only have huge ones and tiny ones. when i tested it, it was tunning on 125 psi on a shop compressor, and i used all my ammo, about 200 bbs, in about 3 seconds. i just need to get some more ammo and test it again

Posted: Mon Dec 29, 2008 5:45 pm
by starman
Looks very nice grock. Is there anyway you can show the inner working details? If you had Neo working with you on the design, I'm sure it's plenty up to snuff!

Posted: Mon Dec 29, 2008 6:17 pm
by grock
sure, the only difference is now there is a aluminum plate between the block and the stock, and the 1/8" barb is cut down a little. its pretty much just like a regular inline, just a bullpup one, so it needed a couple more fittings. i have yet to set up a plunger system yet, should have one within the week

Posted: Mon Dec 29, 2008 6:38 pm
by Floyd
Nice. What is the vortex block made of? Also, what are you using as your barrel (looks like aluminum tube) and where did you get it?

Posted: Mon Dec 29, 2008 8:33 pm
by grock
well, i hang out in my uncle's friends machine shop on saturdays, and i've just been using stuff of his scrap shelf, the block is some kind of plastic like composite, and the barrel is stainless steel.

Posted: Tue Dec 30, 2008 12:01 am
by Davidvaini
looks good, are you gonna add a spring and a plunger around the outside of the barrel so you can get better feed?

If so, then I can provide help with it. I created the coaxial bullpup vortex a while back.

Posted: Tue Dec 30, 2008 12:05 am
by STHORNE
very nice job.

and btw, the barrel looks like an old bb gun barrel. could be wrong though :wink:

Posted: Tue Dec 30, 2008 2:10 am
by grock
yah david, i guess i should say that i did study your bullpup one a while ago, i don't need help on the plunger though. on the barrel, i cut off a 10 inch section from a 10 foot piece i found sitting on a shelf

Posted: Fri Jan 02, 2009 1:28 am
by grock
update: made myself sling mount and screwed it to the part where the aluminum ring holds the grip. i also added some shrouds, and a plunger system