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 Shoei MKb42(H) Firing version

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Cerwyn
Cerwyn (Site Admin)
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Number of posts : 10709
Age : 58
Location / Country : North Wales
Registration date : 2008-07-20

PostSubject: Shoei MKb42(H) Firing version    Wed Dec 09, 2015 1:59 pm

Thanks to some fine tuning and a custom designed, home made cartridge by Forum member 8ace (May God Bless Him  cheers), here is a taster of my Shoei MKb42(H) firing.








Click on each photo to view


Video #1 shows 30 rds fired in Full Auto followed by 4 in Semi Automatic.
Video #2 shows 1 in Semi followed by 31 in Full Auto burst


Achieving this level of performance did not come easy. Some internal modifications were needed but the heart of the standard Shoei's problem was magazines and cartridges. Details of these modifications will follow asap.


I can't thank 8ace enough for his time, effort and ingenuity. Thank You Very Much doesn't come close Exclamation    

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JatiMatic
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PostSubject: Re: Shoei MKb42(H) Firing version    Wed Dec 09, 2015 2:47 pm

Absolute superb blowback action (look how his arms shake while shooting).

In the past modelguns did what they want to do; nowadays it seems, that they start to do what the user wants.

Cerwyn, keep on with the good work!

Jati
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Cerwyn
Cerwyn (Site Admin)
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Number of posts : 10709
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Registration date : 2008-07-20

PostSubject: Re: Shoei MKb42(H) Firing version    Wed Dec 09, 2015 3:13 pm

Thank you for your comments Jati  Very Happy


All credit for this vastly improved firing performance as well as cartridge durability, must go to 8ace. The man is a Genius  cheers 


The standard Shoei MKb42 proved disappointing in its firing performance. There's no denying 

that it is a truly superb replica of this particular rifle, as are all of Shoei's products.
Shoei Cartridges are brass, heavy at 25 grammes and require 2 caps to generate enough blowback. The model's bolt and carrier assembly is heave, big and needs to travel a long distance so strong Blowback power is essential.
Shoei achieved this power using a cartridge design so well sealed internally that no smoke or sound can escape. Two caps generate a lot of power which pushes the bolt and carrier back, but causes damage to the cartridge rim and point where both halves screw together very quickly.
Rim damage was so bad it rendered the cartridge useless and unusable in very short time.
Thanks to Japanese legislation, bolts are made of Zinc which also wears away quickly.


8ace's cartridge is Aluminium, the MkI version only weighed 8 grammes. I've yet to weigh the improved MkII version but it's an efficient, durable cartridge that only needs 1 cap to cycle the gun effectively and reliably.


I will provide more detailed information later showing internal mods to Bolt and Carrier, Magazines, Cartridges etc. as well as more videos  Wink


Thanks to 8ace, now this glorious model performs as I'd want it to, and as it should do  Very Happy

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