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Crossbows - Everything about Building, Modding, and Using your Crossbow Gear

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» Codex Löffelholz crossbow
by stuckinthemud1 Tue Jan 24, 2023 4:14 pm

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» Skane/Lillohus crossbow thread
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» Wood Prods
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» Fiberglass H-bows
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» Bad Antler
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» Anyone make their own bolts?
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» Josef alm in English
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» Qin/Han lock drawings
by kenh Fri Sep 23, 2022 8:16 pm

» stirrup dimensions?
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» Skane/Lillohus lockbow information needed
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» Low Draw Weight Build
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» Trigger testing Rig/Jig?
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» best type of horn to use..
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» Han Dynasty Chinese Crossbow
by hullutiedemies Fri Jun 17, 2022 1:00 pm

» Drawing of Crossbow
by stuckinthemud1 Fri Jun 03, 2022 3:01 am

» "How To Make Everything": Early Crossbow
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» Black inlay
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» Roller nut details
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» 330#/7" wood bow
by Anatine Duo Tue Mar 29, 2022 11:08 am


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    Alloy bull-pup crossbow MK2 project

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    Alloy bull-pup crossbow MK2 project  Empty Alloy bull-pup crossbow MK2 project

    Post by B.Cheers Tue Dec 11, 2012 2:48 am

    Howdy every one
    So im starting my new crossbow which will be a MK2 of my last crossbow just improved and with a few extra features and will be keeping a update on here every week/month or so.

    Im going with a all alloy construct since im better working with metal then wood and am using some airsoft gear like a airsoft folding stock,foregrip,grapic sight and handgrip which greatly reduces the amount of work i have to do.


    Alloy bull-pup crossbow MK2 project  Img_0510
    I started making the trigger first since the rest of the crossbow body will be built around/from the trigger, Its all alloy apart from the sear,latch and pins. But am taking my time on the trigger since im still waiting on a 20mm dovetail rail for my holographic sight.

    Alloy bull-pup crossbow MK2 project  Img_0511


    Last edited by B.Cheers on Mon Dec 17, 2012 5:00 am; edited 1 time in total
    kwandokun
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    Post by kwandokun Tue Dec 11, 2012 5:15 pm

    Nice looking trigger components.

    Looking forward to seeing what you come up with.
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    Post by B.Cheers Tue Dec 11, 2012 8:23 pm

    Cheers mate still gotta make a safety up and abit of filing here and there few spacers and so on
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    Post by B.Cheers Mon Dec 17, 2012 4:59 am

    Hey everyone
    So progress has been slow yet quality got the safety made up and works quite well blocking the sear latch from moving, Also started on sides of the trigger mech which im going to completely enclose anyhow below are some pics of what ive done.


    Also the screws that im using now are just to hold it together for the time been intill i get some flat head screws and counter sink em in.
    Alloy bull-pup crossbow MK2 project  Img_0510

    Alloy bull-pup crossbow MK2 project  Img_0511

    Alloy bull-pup crossbow MK2 project  Img_0512

    Alloy bull-pup crossbow MK2 project  Img_0513

    But still alot more work to do
    Thanks Cheers
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    Post by B.Cheers Wed Dec 19, 2012 7:52 pm

    So ive finished my trigger and am now starting on attaching the rail and hand grip

    Alloy bull-pup crossbow MK2 project  Imag0110

    Alloy bull-pup crossbow MK2 project  Imag0111

    Alloy bull-pup crossbow MK2 project  Imag0112
    kwandokun
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    Post by kwandokun Wed Dec 19, 2012 8:34 pm

    Looks good. Very clean.

    Get a video up of it in action when you get a chance.
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    Post by B.Cheers Wed Dec 19, 2012 11:28 pm

    Yeah im working on it ill prob do a video once i have the handgrip and stock attached since im building it like the lower receiver of a modern assault rifle, with the bolt rail and prod been the upper receiver
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    Post by kenh Thu Dec 20, 2012 5:35 am

    Nice work! You mechanical types really like all those fiddley bits doncha Alloy bull-pup crossbow MK2 project  499925
    I can see where it's challenging. Sure wish I had those skills.
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    Post by chaz Thu Dec 20, 2012 7:17 am

    B.

    SUPER !

    Chaz
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    Post by B.Cheers Sun Dec 23, 2012 8:23 am

    @Kenh cheers mate and yeah thats the main reason ive picked up building crossbows is the mechanical side to it quite rewarding in a sense

    @Chaz cheers mate glad you like it

    So as a update ive done abit on the bolt rail trying to figure out how to make it attach yet still be strong enough to not move from the 80 pound prod pulling since im making the prod and bolt rail as the upper receiver.

    But heres a over view on the parts ive got coming and will give you's a fair idea how this crossbow is gonna look once finished

    Alloy bull-pup crossbow MK2 project  W_144310
    Im using this lower frame housing as my grip and since its 38mm wide the trigger mech will drop into it but will prob need abit of modding to do so.

    Alloy bull-pup crossbow MK2 project  W_125710
    And the sliding stock which will be attached to the lower receiver

    Alloy bull-pup crossbow MK2 project  W_143210
    And last is this under rail which will serve as a means to attach a fore grip.

    All in all it has cost be just over 150 bucks in airsoft parts and 50 bucks for the alloy used to build the trigger and frame which prob isnt to bad for a custom built crossbow.
    thanks cheers
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    Post by B.Cheers Wed Dec 26, 2012 4:30 pm

    Hey every one hope we all had a merry xmas
    So my dovetail rail finally got here and i didn't waste any time mounting it onto the trigger housing the holographic sight does add a fair amount of weight thou.

    Alloy bull-pup crossbow MK2 project  Imag0113

    Alloy bull-pup crossbow MK2 project  Imag0114

    So far the trigger has came out better then i thought ive put it in a jig and tested it with my 50 pound prod with no jams and a easy pull to release, i also put 6 rubber bands onto the latch then put the safety on then dropped it down my back stairs lol and the safety held up with no release.
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    Post by B.Cheers Fri Dec 28, 2012 3:20 am

    Hey hows it going everyone
    So ive started on the crossbow stock and mounting the trigger housing heres a few pics of where im up to on it.

    Alloy bull-pup crossbow MK2 project  Imag0115

    Alloy bull-pup crossbow MK2 project  Imag0116

    Right now im waiting for the hand grip and a fore grip but while i wait for them i can go ahead and finish the rest of the crossbow.
    thanks cheers
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    Post by Todd the archer Sun Dec 30, 2012 3:43 am

    Very interesting, can see working with metal is your medium of choice. Can't wait to see the finished product.

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    Post by jeep Sun Dec 30, 2012 11:09 am

    Hi Cheer. Beautiful craft plenty of ideas!!! But as I see you are willing to spend some $ for nice parts, way don't you put a bit more to invest in a at least a 150 # prod that you find in any corner..... It will be a minimum to complete that amount of nice work you do !!! It look like a beast, he have to be one....Of course it's up to your taste.
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    Post by B.Cheers Mon Dec 31, 2012 1:08 am

    @Todd the archer, yeah ild rather work with metal then wood and with the alloy im using all parts are hand cut with a hacksaw then filed\sanded to fit.

    @Jeep, thanks mate as for the parts these are lol china made air soft parts the scope was only 40 bucks and under rail 38 bucks, and i don't think ill have enough room for a 150 pound prod the crossbow is only 38cms long with a 10cm draw i was meant to set it at 16.5 but dropped it back.

    And heres a video of it in action its still unfinished but at lest it fires well
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    Post by Ivo Sun Jan 06, 2013 7:00 pm

    Sweet sounds of a working trigger mech. drunken Good Job, I'm currently remaking mine...not such great engineering after all.

    Build is looking good, I've always loved the concept of a crossbow built from easily available aluminum/steel stock and have been playing with the idea in my mind dor a good while.

    Got a little sketch of a similar little bow, only with a folding Uzi stock on it.

    Spoiler:

    Hope everything is good on your side of the ocean. Looking forward to the finish line thunder, dude! Smile

    Ivo



    Alloy bull-pup crossbow MK2 project  Untitled
    * *
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    Post by B.Cheers Sun Jan 06, 2013 8:05 pm

    Cheers Ivo yet my trigger is thanks to you from what you've shown me, and i hope you get yours right the second time round.

    As for a alloy stock i think its the way to go for a strong light weight stock, my crossbow so far with out the scope weights 1.2kg/2.64 pound, and your design looks the same as mine except the stock and my hand grip is further back did you design it based off the MP7?.

    But so far im just playing the waiting game im hoping the last parts will be here by the end of the week fingers crossed.
    Thanks cheers
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    Post by Ivo Sun Jan 06, 2013 8:23 pm

    *Glad the info helped. Very Happy

    I really like the uzi folding stock, had a bit of a rant going a while back on how I thought I "invented" it. Laughing

    https://thearbalistguild.forumotion.com/t343-collapsible-folding-shoulder-stocks

    and that's pretty much it...teh stock is what I designed the bow around, but it does look a bit MP7'ish.

    As for sheet metal bows...that field is yet to be tackled. So much cool stuff can be done there. drunken

    Ivo wrote:






    Alloy bull-pup crossbow MK2 project  Untitled
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    Post by B.Cheers Sun Jan 06, 2013 9:51 pm

    Lol yeah i read that awhile back now days its pretty hard to invent any thing and if you do and get it patented some one els can still use it by just changing the design a tiny bit.

    But as for making your own stocks i dont see much point now after seeing how high the quality of just air soft parts are and price, you can buy a sliding MP5 stock for 28 bucks.
    And Ive seen folding stocks for around the same sort of money made from high density nylon.

    Sheet metal bows would be a great way to make money if you had a press since two parts pressed, to make the stock.
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    Post by B.Cheers Thu Jan 10, 2013 11:42 pm

    Howdy everyone
    Did abit more work on the trigger housing pulled it apart and hit it with a epoxy undercoat and black over coat, also checked for any damage/wear from shooting and could see none what so ever which is good.

    This is the last time i put the trigger back together since the rest of the safety will be installed, I gave my self time to think about the best way to go about it.

    And here are some pics of how the housing came out after painting.
    Alloy bull-pup crossbow MK2 project  Imag0117

    Alloy bull-pup crossbow MK2 project  Imag0210
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    Post by B.Cheers Fri Feb 01, 2013 9:04 pm

    Hey everyone how we all been
    Got a big update on my progress with my crossbow, i did run into a few issues main one been customs seizing my hand grip housing but that didn't stop me from continuing an instead used the grip off a tape gun lol also got the stock mounted.

    So here are two pics off hows its looking still need to give it a respray and close the end off where the stock is mounted also re-tap two holes and a few other odds and ends other then that its a dream to shoot and ive also made a mount so i can attach a spear gun reel so i can fire a harpoon bolt.

    Alloy bull-pup crossbow MK2 project  Imag0211

    Alloy bull-pup crossbow MK2 project  Imag0212
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    Post by kenh Sat Feb 02, 2013 7:37 am

    Tape gun housing Shocked Shocked Shocked Shocked Shocked. Say it isn't so!

    One Sunday morning as I went walking

    By Brisbane waters I chanced to stray

    I heard an arbalest, his fate bewailing

    As on the sunny river bank he lay....
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    Post by B.Cheers Sat Feb 02, 2013 10:39 pm

    @Kenh lol yeah it does sound bad a tape gun grip yet it does the job and at lest it didnt cost me any extra and is basically the same sort of grip as the one i ordered.
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    Post by shiloh Sun Feb 03, 2013 5:39 am

    Finally read through this thread, what an awesome project, great job on the trigger mech, you do have great metal working skills, Something that I definitely lack, that`s for sure.

    cheers
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    Post by B.Cheers Sun Feb 03, 2013 7:19 pm

    @Shiloh cheers mate and every one can be good at anything if you just take your time.

    I am thinking of upping the power too 150 pound since the 80 pound prod is great but lacks punching power and all i need to do is upgrade the sear and trigger latch which would only take a day.

    Ill get a video up of it firing along with the harpoon bolt which i can fire 20 meters with the line attached.

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