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CatgutViolin

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Everything posted by CatgutViolin

  1. Actually it's pretty small. 40mm grenades aren't that big, so overall it's actually shorter than any of my shotguns. I did make a build thread over in the Arnie's Custom Build Competition subforum. I also have a video: http://www.youtube.com/watch?v=QUR2Q1NgOLw&feature=youtu.be
  2. Thanks for the link. Simpler, perhaps, but I'm not sure about easier. If I can get plastic tubing of the right size, that'll be a piece of cake to produce large quantities of shells. Also less likely to get them mixed up with regular shells.
  3. That is actually a really good idea, but it's dependent on the airsoft shells being designed to the same specs as the real ones. I don't have any .357/.38 brass on hand so don't know myself. Nothing's out of the question. My main issue so far, actually, is that the spread is too tight for the room-clearing I'd like to use it for. It's beautiful at 50-75ft, where the spread is a little under two feet in diameter for a sure hit, but at 25 feet or less the extra BBs are redundant. I plan to test how a shorter barrel affects it.
  4. Building things is lots of fun. Scratch-built double-barreled 40mm grenade launcher. Two Maruzen M1100-based shotguns. Semi-auto, powered by external gas, spit 9 BBs per trigger pull as quickly as you can pull it. Stubby ACM M500. Had to totally rebuild the feed mechanism, now it works on Marui tri-shot shells. And nothing changed about the gun, but the homemade shells mean that instead of belting one BB at 400-500fps it shoots six at a time at a much more reasonable velocity and decent spread.
  5. Oh look at this, a stupidly hot CO2 revolver that can't be used at any field. Wait, those aren't the normal shells. Forget tri-shots, these are hex-shots, using a burst of CO2 to blast six BBs out the muzzle every time you pull the trigger. Forget six-gun, when you can have a thirty-six-gun. When you absolutely need a room devoid of life, accept no substitutes. ...Next up is replicating them in plastic, preferably with rims, so I can make thirty or so and keep them on speedloaders.
  6. HFC-134A can easily get up to 110-120PSI on a hot day, same as propane at room temp. A gun that can't handle anything over its intended pressure is poorly designed, simple as that. It's not like we're talking about running unregulated CO2 and complaining that it can't handle 850PSI, it is absolutely reasonable to expect a decent safety factor. Whether there are documented cases yet of them blowing up, I sure wouldn't want to be running that risk with my face up against a plastic stock containing such a gas tank. And I'd be concerned about what these guns will look like in two or three year
  7. If these parts are deforming under the pressure of propane, then shame on Marui for such poor engineering. The standard rule is that a gas container should be able to withstand three times the pressure it's rated for. If the tank is meant to be used with HFC-134A, which is a little over 80PSI at typical room temperature, then it should be able to go up to 240 PSI- and that's double what propane is under typical UK/US use conditions. Deformative expansion over time can lead to structural failure and possibly kaboom. For a part to risk this at just over its specified operating pressure is ex
  8. Speaking of 1014s, here's a WIP:
  9. Ah, I see how that works now. Very cool system and overall looks very similar to what I ended up using- the main difference being that by using the original locking mechanism, he didn't have the issue I've been having over trying to friction-fit a cap that can be removed by hand but provides enough force to make the shells feed. I ended up redesigning the endcap so it now rotates to lock in place, and shortened it to fit two shells in the tube. Don't know if I want to glue them back to back like he did, I have enough shotgun webbing and gear that keeping them as individual shells might be
  10. Mind linking to his version? I can't seem to find anything through Google.
  11. I made a video if you want to see how it works. Sorry for the quality, I don't have any decent recording equipment at the moment. http://www.youtube.com/watch?v=0fK1yZ9e0Qs
  12. With a Dremel and a bit of patience I was able to widen the feed hole into an oval that reached to the center, then I used putty to fill the bottom of it to turn it into a circle centered in the tube, then I attached a feed nozzle from an AK hop-up unit and used epoxy putty to secure it in place. It's not pretty but it works. This photo also shows the extraordinarily improvised ejector system used to remove a shell that sticks to the nozzle.
  13. Today I finished a thing, based on an ACM M500.
  14. AFAIK all of notrabies' shotguns are modified for external tanks, but he and I use CO2. HPA works fine too and doesn't have cooldown.
  15. I got an ACM M500 in a trade, then bought another so I can swap parts and furniture and have a ready supply of backup internals.
  16. Mag fed. The shell ejector stores gas in the grip or stock, so without either of those there's nothing to provide power.
  17. The funny thing is, that's literally the only way possible to load the real thing. The real SPAS-12 requires you to hold down a button on the side of the receiver to load it, otherwise the lifter won't budge and there's no way to get the shells into the gun. One of many reasons why it wasn't as successful as Hollywood would lead one to believe. The main problem is that the gun weighs just shy of ten pounds. Holding it shouldered while trying to feed eight shells in gets uncomfortable pretty quickly. Normally Maruzens lose their reliability because the pot metal extractor wears out
  18. Got that video done. http://www.youtube.com/watch?v=6_atCQWgSao&feature=plcp
  19. Total pain in the rear the way I did it, which was using the KTW grip. If I were to do it again I would definitely use the Marui grip instead and bend the stock to fit it properly. It might not be as smooth, but it would look better and be more stable. Yes, I have a Palmer's rig with adjustable pressure. I'll be making a video soon-ish to demonstrate its operation.
  20. You wanna know the funny thing about that video? The guy took the easy way out. He didn't make it use the extended tube, that's the faux Marui tube on the front. Notice how at the start he loads five rounds, then the other sequences he fires six- the gun has a 5+1 capacity, using the standard-length mag tube. I instead cast the block at the front of the shroud, replicated it in resin, drilled a hole, and fed the Maruzen mag tube extension through, then epoxied on the sling mount. That video was my inspiration for this project, but I think this gun may be the first Maruzen-based SPAS-12 to
  21. Thanks! To be honest it's simpler than it looks, gutting the Marui is pretty straightforward, then it's just a matter of sticking the internals from the Maruzen in. The main problems are these: -The block at the front of the shroud is solid, and the magazine tube can't go through it. I ended up taking a rubber mold of the part and duplicating it in resin, then drilling the offending piece through so I could stick the mag tube extension through. If you don't want to do this, the standard 5+1 magazine tube fits fine within the shroud, and you can just use the Marui dummy tube extension on th
  22. I'm the guy in question. I've just about finished the build after a grueling twelve hour marathon, but I only just signed up to this site recently so I've been documenting my progress on a couple other forums. I'll be posting a writeup and better pictures later, as well as a firing video at some point, but for now here's a crappy WIP picture. Still have a little bit of work to do but it's just about completed. This is by far the most ambitious project I've ever attempted (well, not saying too much since I've only been airsofting for just under a year now), but a lot of the complexity comes fro
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