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8mm Bolt Action QEV

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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8mm Bolt Action QEV

Unread postAuthor: vng21092 » Sat Oct 03, 2015 9:04 pm

Alright guys I'm VERY excited and proud to present to you my FIRST ever BOLT ACTION RIFLE. I've made several attempts in the past but I always gave up but this time I stuck on through and finished it. Operating at 55 bar line fed from a HPA tank, 18'' long barrel, QEV piloted by a slide valve. I took many pictures documenting the build process, here it goes.

1) Nothing special, but its the first epoxy cast piston I ever made, turned out pretty well, hope JSR is proud.
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2) Now, onto the bolt housing. Its came from the same piece of pipe as the barrel, I ordered a 36'' piece so I had some left over. I measure the location of the hole to make sure it matched up with the PVC house it was inside of. The housing has an O-Ring super glued onto the end where the BB gets pushed through. The bolt is just a 1/4'' bolt, using a grinder to make the tip. I put heat shrink on the bolt to add some thickness, and I put a second layer on the tip of the bolt so it sealed against the O-Ring.
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3) Bolt in housing
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4) Trying to show the seal between O-Ring and bolt tip
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5) Here is the breech hole
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6) Bolt mechanism all together
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7) Just so you can kinda visualize whats going on inside the tee. The black is the tip of the bolt, the gray is the barrel, the purple is the BB, and the little black under the BB would be the detent.
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8 ) My super complex barrel detent (just kidding, it's just a piece of tape)
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9) ALRITE, TIME FOR SOME BODY SHOTS
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10) Another piece from the leftover barrel used as a gravity fed 6 round magazine
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11) Magazine inserted
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12) And of course, this


13) The whole system
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vng21092
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Re: 8mm Bolt Action QEV

Unread postAuthor: jackssmirkingrevenge » Sun Oct 04, 2015 7:34 am

JSR is proud


Very much so, even as I saw the thumbnail!

Fantastic job :D all you need is a slightly more refined spring loaded mag
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Re: 8mm Bolt Action QEV

Unread postAuthor: django » Mon Oct 05, 2015 5:13 am

Nice work!, I love it, so much so that I spent ages yesterday making one myself BUT I find that if you don't fling that bolt forwards REALLY fast then the bbs drop down into the Air inlet( lowest part of the Brass T Fitting). Im trying to improve it
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Re: 8mm Bolt Action QEV

Unread postAuthor: vng21092 » Mon Oct 05, 2015 7:35 am

haha yea, that does happen. What I think could work is if the barrel protrudes inside the tee enough that its basically touching the bolt housing (the tip of the bolt would be inside the barrel at this point), and you drill a hole right beneath where the bolt tip is. Of course the hole would have to be a smaller diameter than the BB or it would fall through there too :lol: .Kinda like how the commercial ones are built. Like so:
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Re: 8mm Bolt Action QEV

Unread postAuthor: Doodmens » Thu Oct 08, 2015 10:34 am

Wow that is reallyyyy sexy! Want to build me one of these sooo bad now! Nice scope as well, was it expensive? I see you use those little brass blocks as fittings, are those regular fittings or did you make those yourself? never seen those before; where I buy them, they are always in pipe-shape.
Good job!
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Re: 8mm Bolt Action QEV

Unread postAuthor: vng21092 » Thu Oct 08, 2015 5:22 pm

Thanks buddy! Actually, the scope was rather inexpensive, I was skeptical at first because of the low price, but after I got it I was really happy with it so I bought another one just in case. As far as the brass fittings goes, I purchased all of them off Amazon.
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Re: 8mm Bolt Action QEV

Unread postAuthor: PAweaponTech » Mon Oct 12, 2015 5:21 pm

Another solution to your projectile falling into air supply is to have the air come through the bolt instead, but that raises other issues.
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Re: 8mm Bolt Action QEV

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