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ardrummer292

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Everything posted by ardrummer292

  1. Phase 5: Repairs, reinforcement, and loading system upgrades WiiTech provides upgraded nozzle shuttle springs with their top gas nozzle. The WiiTech top gas nozzles I bought came with stronger nozzle shuttle springs for use with higher pressure gases. I believe these nozzle shuttles automatically throttle propellant flow to each inner barrel, leading to more consistent velocities and patterning. The operating pressure I determined for the gun, 72 psi, is more readily associated with duster gas than propane: at 75 F/23.9 C, HFC134a puts out about 79 psi while propa
  2. Phase 4: Power source conversion The gas port: in stock form (L) and after removing the taper, drilling, and tapping with 1/4-28 thread (R). I play year-round, so my equipment has to endure everything the east coast of the US can throw at it. That includes temperatures ranging from 20 to 105 F (-7 to 41 C). Additionally, I needed a lot of propellant readily available due to the high attendance at my home field. Much as I hated to admit it, HPA was the only way to make this shotgun viable for my purposes. How does one go about converting the TM M870 to
  3. Phase 3: Hopup system experimentation A peculiar design: the rubber just sits on top of a cutout in the barrel. The gun’s erratic trajectories out of the box were due to excess grease coating the hop rubbers and inner barrels. Similarly, the post-Phase 2 upgrade hopup issues were caused by more grease being fired down the barrel. I stripped the gun down and wiped off as much excess grease from the air system and barrels as I could. This involved disassembling the expansion chamber, nozzle, and hopup unit/inner barrel assembly. Now that the source of th
  4. Phase 2: Serviceability and upgrades A gun I can’t repair myself is a gun that I won’t often use. I needed to know how the shotgun goes together and how it works, which led me to watch basically every disassembly and troubleshooting video available. Without this prior knowledge, I would’ve been much more apprehensive about buying it, let alone tearing it down. I assumed the stock performance wasn’t going to be up to my standards, so I placed an order with WiiTech around the same time I ordered the shotgun itself. The package containing the upgrade parts arrived at my do
  5. Phase 1: Out of the box The faux wood looks lovely and the metal components have a nice satin finish. The bolt cover is bright chrome, which I don’t like. I heard a worrying sliding/rattling sound upon picking it up; this was the useless shell tube storage feature, which I plan to remove at a later date. This version of the shotgun comes with an old-school red shotshell instead of the newer green or white shells. It also features a bead sight instead of the ghost ring sights on the Tactical model. The bead sight pedestal is secured to the outer barrel with double-sided tape, which
  6. Phase 0: Research Now that I had decided to buy the gun, I wanted to know what to expect from it. This took hours of research, evaluating conflicting reports and filling in the blanks with educated guesses. Below is an abridged version of all the information I could find online. Bear in mind that some of this information dates back to the gun’s initial release in 2013, meaning that some of the teething problems mentioned within have since been solved. Overall notes: Most performance issues seem to be related to the loading system and gas system Gas system
  7. Inception: What gave me the idea to buy a shotgun? My primary weapons, circa 2005. I had a couple slow days at work. Naturally, my thoughts drifted away from the job and towards airsoft. I got to thinking about how awesome it would be if TM released a semi auto Benelli M1014. That kicked off a nostalgia trip. I haven’t run an airsoft shotgun since 2006, but I distinctly remember enjoying it quite a bit. I even wrote a (pretty cringe-worthy) piece on firepower deprivation and how it relates to the airsoft “combat mindset.”[1] Seeing as how I’ve been a machine gunne
  8. Apologies for the bullet-point formatting. It seems I can't modify it so each list is single-spaced. If the formatting really bothers you, here's a link to this same document on my google drive: https://docs.google.com/document/d/1U8acwm_xEDo04XfRLj5s-8Zh1z1LMpER9AGWt6l8ONQ/edit?usp=sharing TOKYO MARUI M870: BUILDING THE ULTIMATE AIRSOFT SHOTGUN This is a modification-oriented overview of the Tokyo Marui M870, which has been written over the course of 6 months and covers each phase of my modification and outfitting plan. Treat this writeup as a technic
  9. If the tactical arms don't fit, I'll gladly buy them from you.
  10. Does anyone know what purpose the springs indicated in the picture serve? My guess is that they provide some sort of automatic throttling function, regulating gas flow into each barrel.
  11. I still remember seeing that pic of you with your old TM SPAS12 way back in 2004-05. I thought it was the coolest thing ever, so I saved my allowance and eventually bought one.
  12. I can see activity here picking back up in the near future. If nothing else, this medium lends to more civil discourse and helpful answers than social media.
  13. Batmause's disc and o-ring is supposed to perform a similar function as the modified x-ring. Hopefully my x-ring ends up being an effective fix. The SAT output valve is the only component I know of that stabilizes the valve stem through use of an additional support. Unfortunately, this means that you're restricted to using SAT valve stems when the metal eventually mushrooms.
  14. Where is it leaking from? Have you tried the x-ring mod? EDIT The aforementioned mod is done in this video:
  15. I got a TM M870 wood version about two weeks ago. It's worth mentioning that I haven't had a single issue with it, even after being fully disassembled twice. For those of you concerned about the gun being DOA, rest assured that the newer batches seem to be a-ok out of the box.
  16. Has anyone managed to fit a real stock to their 870? How about a stock designed for the G&P springer series? Gas storage is not a concern, as I'll be running a remote line for HPA.
  17. Just ordered my TM M870 wood stock this morning. I'm sure I'll be posting panicked questions in here soon.
  18. Also, no barrel wobble. He's still here. I'm currently pestering him via PM with some technical performance-related questions about the TM M870.
  19. To be fair, that sort of thing was present on forums too. Not *this* forum, thanks to the moderating team, but certainly less well-run forums. It seems facebook is rife with spoon-feeding requests. Likely because people can easily report your page if their feelings get hurt by the moderating staff.
  20. I imagine I'm perceived as lazy on facebook myself, but that's largely due to the disaster that is facebook post archiving. The old adage of "use the search function" falls flat when searching doesn't work. Forums are superior in this regard, among many others.
  21. Someone added me. The group is still around, but GOOD LORD do I have to sift through a lot of garbage to find what I'm after.
  22. It appears that the TM M870 and KSG Owner's Group has gotten the zucc, so I'll be asking my questions in here. I chopped together a "Cliff Notes" version of everything relevant to my interest from the original review thread as well as this thread. Let me know if anything is incorrect.
  23. I find that I'm in a better mood all week if I play the weekend prior, soreness be damned. Nothing like a bit of vigorous activity to get the endorphins flowing.
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