Bren MK1m, My interpretation

A place to discuss WW2 airsoft guns.
Lazyboy
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Bren MK1m, My interpretation

Postby Lazyboy » Tue Mar 10, 2020 10:09 pm

The gun is made of Aluminium

It has an airsoft 650mm barrel, with a modified hopup.

HPA powered through a computer controlled custom built engine

Rate of fire is 480 rpm

Magazine holds 110 rounds.

Electrics powered by a 12 volt 600 mAH battery in lower body.

Initial testing on 75 - 80 psi, has it shooting at 1.38 joules, firing .4's and was firing 60 metres +.

With .25's, they were over hopping with the no hop on, have been told a softer bucking may solve that.

Firing hot so with turning and lighter BBs should get it down to safe levels



Here is a video, showing stripping and dry firing the gun
Attachments
BrenR1.jpg
BrenR2.jpg
BrenR3.jpg
BrenR4.jpg
Bren Disassembled.jpg
Last edited by Lazyboy on Sun Mar 15, 2020 10:56 pm, edited 1 time in total.
Lord Elpus
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Re: My interpretation of a Bren MK1m

Postby Lord Elpus » Fri Mar 13, 2020 12:58 pm

I can’t get photo’s up, but did get on the link, looks great! Well done! Put up more pic’s!
Andy
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Lazyboy
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Re: My interpretation of a Bren MK1m

Postby Lazyboy » Sun Mar 15, 2020 10:58 pm

Lord Elpus wrote:I can’t get photo’s up, but did get on the link, looks great! Well done! Put up more pic’s!
Andy

Thanks
I have replaced the photos, so hopefully you can now see them
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dadio
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Re: Bren MK1m, My interpretation

Postby dadio » Tue Mar 24, 2020 5:07 pm

That's a superb build well done good sir :good:
armoury
m1a1 Thompson,sten mk2,mp40,stg44,sterling,mk2 bren gun,lee Enfield no4 mk1,Mauser Kar98, Walther ppk,smith and Weston m10 and Mauser m712
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SCVNGR
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Re: Bren MK1m, My interpretation

Postby SCVNGR » Tue Mar 24, 2020 10:55 pm

Did you make the body yourself?
kingmaker
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Re: Bren MK1m, My interpretation

Postby kingmaker » Thu Mar 26, 2020 8:51 am

Top class work there,like the sound and rate of fire,very realistic. :happyclap:
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Lazyboy
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Re: Bren MK1m, My interpretation

Postby Lazyboy » Fri Apr 03, 2020 11:45 pm

Thanks for your replies.
SCVNGR yes I did make the body.
The flat pieces where sliced from my 3D model and laser cut, then glued and riveted together, other bits are welded.
The round bits were made on a lathe.
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Re: Bren MK1m, My interpretation

Postby kingmaker » Sat Apr 04, 2020 8:05 am

how did you build
the hpa engine did you source your own solenoid,what chip do you use to control it?is it an arduino?
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Lazyboy
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Re: Bren MK1m, My interpretation

Postby Lazyboy » Sun Apr 05, 2020 1:30 am

Hi Kingmaker.
The gas block is made out of Brass 25mm hex bar and is basically a blow forward bolt, reversed, ie the the small valve pushes the nozzle back to load and a spring closes it when pressure is off .
This happens as the first step in the firing sequence, folowed by a pause then the main valve fires the round.
The small solenoid valve is a Mac series 33, 6 volt valve I had lying around and the main valve is a Mac series 34, 12 volt, 4 Watt valve brought off Ebay.
You need the 4 Watt version to get good performance, I also removed the brass filter from the inlet of the valve for more flow.
The micro computer is the Picaxe 08m2, (PICAXE-08M2 Module (AXE231)) plus volt regulator, and a couple of ndrive mosfets.
I have just brought a number of ATtiny85 Digispark Kickstarter Micro USB Development Board Module and are hopping to use them, as it will dramatically reduce the electronic footprint .
I am a complete armature with electronics so need to puzzle my way through using the ATtiny's,.
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Re: Bren MK1m, My interpretation

Postby kingmaker » Sun Apr 05, 2020 6:40 pm

well it sounds like you have it sorted to me you should start your own HPA engine company,are you in
sorry mentioned Australia again
Last edited by kingmaker on Sat Apr 11, 2020 11:53 am, edited 1 time in total.
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Lazyboy
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Re: Bren MK1m, My interpretation

Postby Lazyboy » Sun Apr 05, 2020 9:10 pm

Wash your mouth out :wink: , New Zealand.
Nice idea but a bit old for the company sort of thing,
Mainly do this to learn and keep the brain ticking over.
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Re: Bren MK1m, My interpretation

Postby kingmaker » Tue Apr 07, 2020 3:48 pm

Did you programme the processor too?Airsoft is still banned in Australia I believe,they have to do with Gel blasters
sorry mentioned Australia again
Last edited by kingmaker on Sat Apr 11, 2020 11:54 am, edited 1 time in total.
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Re: Bren MK1m, My interpretation

Postby razorlight » Sat Apr 11, 2020 11:49 am

That is very impressive. Superb work. Well done! :good:
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Lazyboy
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Re: Bren MK1m, My interpretation

Postby Lazyboy » Tue Apr 28, 2020 2:14 am

Hi
Re Kingmaker, yes I did, I modified the program I used for my Owen gun, which was developed with the help of the Picaxe micro computer forums.

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