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 Post subject: Pulse Rifle Build (cont.)
PostPosted: Tue Mar 13, 2018 9:13 pm 
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Location: North Yorkshire, UK
Service Number: A10/TQ1.0.82125E1
Country: United Kingdom
OK, many thanks for the encouragement from everyone who has so far commented on this project so far. So here is the second installment, the SpaS conversion to the grenade launcher.
This purchase was a little on the steep side at nearly £60.00GBP considering the few parts required. It is possible that a cheaper version is available or purchased second-hand.
Any way, enough waffle......Here is the build.
As it arrived, purchased from the same source as mentioned previously.
Attachment:
The Box
20180312_124603.jpg
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The two parts required are the barrel cage and the slide grip.
Attachment:
Strip down
20180312_124815.jpg
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The slide grip needs to be cut down as shown.
Attachment:
Cut the slide grip
20180312_124916.jpg
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Next the ejection port needs to be cut into the cage side. TAKE CARE---Make sure the port is cut into the correct side of the cage, I cannot stress this to strongly. ( I am fortunate to Have a Snow Wolf M41A PR as reference, so I hope the these images are useful).
My ejection port is slightly more square than the Snow Wolf's and was cut in using my trusty dremmel, then sanded.
(In hindsight I shoud have filled the two slots in the cage and cut the ejection port more acurately.)
Attachment:
Ejection port cut into cage side
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Attachment:
A closer view of the ejection port
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Last edited by UK_Jackson on Tue Mar 13, 2018 10:59 pm, edited 1 time in total.

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 Post subject: Re: Pulse Rifle Build (cont.) #2
PostPosted: Tue Mar 13, 2018 9:41 pm 
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Location: North Yorkshire, UK
Service Number: A10/TQ1.0.82125E1
Country: United Kingdom
The next job for the dremmel was to cut the ejection port relief into the slide grip. Slip the grip onto the cage and mark where the slide covers the eject port. Be aware at this point that the slide only has two runners as the rejected part of the slide has the other two. now cut out the relief.
Attachment:
Slide grip with eject port cut out
20180312_124944.jpg
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With the eject relief cut out the slide now only has ONE runner, so it is essential to glue in two new ones.
Attachment:
The inside of the slide with the two new runners
20180312_125318.jpg
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The launcher barrel sleeve and magazine tube are made from 34mm uPVC waste pipe. The top barrel sleeve is cut to length from the eject port to the end of the cage, and the mag tube the full length of the cage. To make them fit inside the cage the mag tube needs to have a strip cut out down its full length and then glued to the barrel sleeve (I used a hot glue gun for this).
Attachment:
Barrel sleeve and mag tube
20180312_125628.jpg
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Attachment:
Barrel sleeve and mag tube assembled with cage
20180312_125721.jpg
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Using the dremmel yet again I cut a thin slit into the bottom of the mag tube that corresponds to the loading port underneath the cage from the front but NOT all the way back (approx 2/3rds)
Attachment:
Slit cut into bottom of mag tube
20180312_125752.jpg
20180312_125752.jpg [ 113.12 KiB | Viewed 536 times ]

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 Post subject: Re: Pulse Rifle Build (cont.) #3
PostPosted: Tue Mar 13, 2018 10:08 pm 
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Location: North Yorkshire, UK
Service Number: A10/TQ1.0.82125E1
Country: United Kingdom
The sliding breech is made from the same uPVC pipe and is just slightly longer than the eject port. To this I added a thin strip of pipe to act as a spacer and a longer and wider strip that is about the same length as the loading port aperture in the cage. These I glued and drilled and screwed together.
Attachment:
Sliding breech
20180312_125811.jpg
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Drill a small hole in the strip approx. 2 cm forward of the leading edge.
Attachment:
Drill small hole
20180312_125831.jpg
20180312_125831.jpg [ 155.8 KiB | Viewed 535 times ]

The barrel and breech are made from 28mm uPVC pipe. The breech should fit at least 2 inches into the barrel sleeve and extend backwards but not beyond the hole it in the top of the cage and a section cut out the same length as the eject port. The barrel muzzle is shorter but long enough to fit at least 2 inches into the sleeve. I wrapped insulation tape round these parts to get a tight fit. DO NOT glue at this time.
Attachment:
Barrel and breech
20180312_125858.jpg
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Attachment:
Barrel, muzzle, sleeve and mag tube prior to assembly
20180312_125952.jpg
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Attachment:
Assembled
20180312_130037.jpg
20180312_130037.jpg [ 115.95 KiB | Viewed 535 times ]

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 Post subject: Re: Pulse Rifle Build (cont.) #4
PostPosted: Tue Mar 13, 2018 10:32 pm 
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Location: North Yorkshire, UK
Service Number: A10/TQ1.0.82125E1
Country: United Kingdom
OK the tricky bit......making the sliding breech work....
I used a piece of wire cut from a wire coat hanger and made two right angle bends in it so that it was 3.5cm in height (unfortunately like a complete tw*t I forgot to take a photo prior to fixing) however I twisted the bottom through 90 degrees so that it fit in the bottom of the grip with the top bend facing towards the breech and fixed it in with Milliput body filler LEAVE TO CURE.........PUT IT DOWN
Attachment:
Sliding breech con-rod ( special part # 3548-489C/A23 )
20180312_130052.jpg
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Now slide the whole barrel, breech mag and sleeve assembly into the cage from the front.
Attachment:
Fitting the sleeve assembly
20180312_130220.jpg
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Tricky bit #2 Insert the wire hook on the grip into the small hole drilled in the long strip under the sliding breech and snap grip into runner grooves.
Attachment:
Insert Special Part # 3548-489C/A23 into the small hole in the breech strip
20180312_130456.jpg
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Attachment:
Grip fitted
20180312_130708.jpg
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Attachment point, White 5mm plastic spacer, cut down chucky block and screw, DO NOT GLUE at this time.
Attachment:
Attachment assembly
20180312_130915.jpg
20180312_130915.jpg [ 141.08 KiB | Viewed 534 times ]

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 Post subject: Re: Pulse Rifle Build (cont.)
PostPosted: Tue Mar 13, 2018 10:50 pm 
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Location: North Yorkshire, UK
Service Number: A10/TQ1.0.82125E1
Country: United Kingdom
The chucky block acts as a stop for the sliding breech.
From an off cut of the 34mm pipe I cut and shaped using the dremmel a piece that is the same shape as the loading port under the cage.
Now measure the distance of travel of the sliding breech connector (Special Part# 3548-489C/A23) from the closed position to the open position where the grip relief lines up with the eject port, then cut a thin slit from the front of the piece to the point where the breech is fully open. this acts as a stop for the slide.
Attachment:
Loading port cover
20180312_131131.jpg
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This will eventually be glued in place.
Attachment:
Loading port cover in situ
20180312_131211.jpg
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The build so far.........
Attachment:
Build so far
20180312_131316.jpg
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Attachment:
My build on shroud templete and Snow Wolf
20180312_132529.jpg
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Attachment:
Just to prove that this IS a kitchen table build......
20180312_132556.jpg
20180312_132556.jpg [ 294.7 KiB | Viewed 531 times ]


If anyone has any questions or would like further info/explanation please let me know and I will do my best to ammend my process descriptions.

Transmission terminated

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My mommy always said there were no monsters, no real ones... but there are.
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Last edited by UK_Jackson on Thu Mar 15, 2018 7:01 am, edited 1 time in total.

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 Post subject:
PostPosted: Wed Mar 14, 2018 4:09 pm 
THAT guy
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Location: Virginia
Service Number: A03/TQ2.0.02146E1
Country: United States
Your innovation and attention to detail is very impressive!

If I might make a suggestion on the shrouds, since you are scratch building them I suggest not fully copying the Snow Wolf template. There are some inaccuracies that you can easily fix.

The 3 most glaring are the height/squareness of the rear top, the length of the counter space (which in turn makes the magazine housing too low), and the 'trapezoid' on the front bottom (which is too centered).

This is how I modified one set, but in your case you can avoid those issues all together by just tweaking the template drawing.
Attachment:
20150608_191041.jpg
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 Post subject: Re: Pulse Rifle Build (cont.)
PostPosted: Wed Mar 14, 2018 7:41 pm 
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Location: North Yorkshire, UK
Service Number: A10/TQ1.0.82125E1
Country: United Kingdom
Many, Many thanks, I think it might be a bit too late on this build as I have already cut two of the pieces of ABS. However I have a load of foam board that I will make another shroud out of to your specs.
Hope my photos and relevent descriptions are helpful and easy to follow.

Cheers

Transmission terminated.

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