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Tacitus

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Everything posted by Tacitus

  1. Tacitus

    MagPul PTS MASADA ACR

    At these power levels, a high speed neo magnet motor like Element or SHS will give excellent trigger response.
  2. Tacitus

    MagPul PTS MASADA ACR

    Why is everyone insisting on using torque motors in such low power guns?
  3. Tacitus

    MagPul PTS MASADA ACR

    High torque but overpriced. Seriously, the SHS/Element high speed motor is great and has plenty of torque for an M120 spring.
  4. Tacitus

    MagPul PTS MASADA ACR

    No need for a torque motor to pull that spring. An SHS high speed motor will easily pull it, and much faster.
  5. Tacitus

    MagPul PTS MASADA ACR

    Whaaaat?? That's crazy talk. As a tech he should have a stockpile of different pistons for testing. I have an SHS full metal tooth piston in mine. I had to file down the teeth very slightly to prevent them rubbing the top of the sector gear on the forward stroke.
  6. Tacitus

    A Magpul Masada project

    I didn't manage to get that link working :/ Which specific Kanzen bearings didn't fit? Any were they too large for the bushing hole, or were they too thick for the gears? I haven't had a chance to try out those Modify gears, but I've heard some bad stories about them. I always use Siegetek gears since they're known to be extremely reliable. Please let me know what happens with your stock bushings. I might actually install mine, since I'm not happy with the noise coming from my gearbox! Those DC3 connectors look very similar to the XT60. I might actually be the exact same bullet connector in a different casing.
  7. Tacitus

    MagPul PTS MASADA ACR

    Yes, further back in this thread many people have reported the exact same problem.
  8. Tacitus

    MagPul PTS MASADA ACR

    When I upgrade guns for people, I always insist on choosing the parts myself. But even then there can be compatibility issues, as manufacturing tolerances can be very loose. Try to customise a Masada and there's a whole host of extra problems thrown into the mix. I've heavily modified mine just to get standard parts to fit, but I'm nowhere near finished with it.
  9. Tacitus

    MagPul PTS MASADA ACR

    That all sounds entirely plausible to me. 6 weeks isn't so long to be working on a gun, especially a proprietary one with so many unique problems. May I ask who your tech is? And who selected the parts?
  10. Tacitus

    MagPul PTS MASADA ACR

    I didn't do a before and after test with this nozzle so I can't say for sure, but it feeds perfectly and provides an excellent seal around the cylinder head nozzle, so I'm confident that compression will be more consistent. I haven't seen a Wiitech nozzle yet so I can't say how the two compare. What spring are you going to be using in you Masada?
  11. Tacitus

    MagPul PTS MASADA ACR

    There's a full parts list in the comments section of my blog post. What work are you having done to yours?
  12. Tacitus

    A Magpul Masada project

    Thanks Eric! I've replaced almost all the internal parts. Extreme-Fire SW-AB-Long MOSFET custom made without AB (yeah, weird I know ). I've replaced the fuse with one I made, and I've added a tracer unit control circuit of my own design, which enables any battery to be used with the internal tracer unit. New wiring, using this 16 AWG stuff. It's nice and thin, but the insulation is tough and heat resistant. XT-60 connectors - Loving them at the moment. SHS High Speed motor - Excellent performance. Modify 8mm ceramic bearings Siegetek GS-R Revolution high speed gears. Siegetek gears are the best you can buy, and in my experience the only ones which can be considered reliable. Guarder anti-reversal latch, but I'm currently trying to get the orginal one working properly. SHS full metal tooth piston, lightened. Trigger replaced with this micro switch, and installed this micro switch to activate the tracer. This took about two days of tuning to get right, but at some point I'd like to improve it with a more robust design. Guarder SP120 spring - I haven't chrono'd it yet and I'll update when I do. Air seal nozzle from AirsoftPro.cz Sorbothane and urathane fitted to the stock cylinder head. I'm going to experiment with a shorter inner barrel made by Madbull and appropriate cylinder that I have lying around, just to see how it affects the accuracy. Guarder clear bucking, cut down to fit. I have a few FlightTech LiPos that fit into the handguard, the largest is a FlightTech XS 2150 7.4V 50C (107.5A) measuring roughly 10.5cm x 1.7cm x 3.4cm I always use a Wolfdragon PCB to protect my LiPos. I like the V4.x with trigger mod, which stops you firing the gun when the battery voltage drops below a safe level. Think that's it, let me know if there's anything I missed!
  13. Tacitus

    A Magpul Masada project

    Ah, that's very interesting! What's your setup? I'd be interested to know how well the original bushings survive in an upgraded gun, especially with Siegetek gears. I assume you're using the MAG stainless steel shims? They're my favourite ones, I'm waiting for a large quantity to arrive at the moment.
  14. Tacitus

    MagPul PTS MASADA ACR

    I'm sorry to double post, but this should be a useful addition to the thread: I just made my review into a blog post, so it'll be easier for people to find (currently it's hidden somewhere in this ridiculously huge thread). I'm upgrading my Masada at the moment and I'll be updating the blog as I go, so people can keep track of it there instead of sifting through almost 100 pages here.
  15. Tacitus

    MagPul PTS MASADA ACR

    Building an internal tracer unit into the Masada is absolutely doable. There are a couple of extra steps involved, but it's not a problem if you have a few roll pin punches and a dremel.
  16. Tacitus

    MagPul PTS MASADA ACR

    I have some calipers arriving this week, hopefully today, so I'll measure a few pistons for comparison. Can you be more specific about how piston length was a problem? Too long and unable to fully cycle?
  17. Tacitus

    MagPul PTS MASADA ACR

    If a piston isn't compatible, it's usually because the piston teeth are slightly too close to the sector gear, causing excess friction. It's caused by the sector gear bushing hole being too close to the piston guide rails on the mechbox itself. This can be overcome by sanding/grinding down the piston guide rails on either the piston or the gearbox, piston preferably. This is common to many gearbox shells. It's better to modify a decent piston than choose an inferior one just because it fits the Masada gearbox with no modification. So I'd say go with your first choice of piston and sand down the rails of that piston until it meshes well with the sector gear. None of the other dimensions should be an issue, as with most AEGs.
  18. Tacitus

    MagPul PTS MASADA ACR

    A friend of mine just last week had a faulty G36C returned to him from the techs at Wolf Armouries. They did not fix his gun, and reported that the feeding tube was cracked and couldn't be repaired. I openend it up and found no such breakage. There was evidence suggesting that the gearbox was never opened ie. factory locking glue still holding the gearbox screws in, brand-new looking screws heads etc. If I can fix it, any airsoft tech should be able to. Espescially one attached to a retailer. I've had conversations with the techs at Wold Armouries in the past and I distinctly remember the terms 'angle of engagement', 'gear ratio' and 'sorbothane' were lost on them. Basic stuff that every tech needs to know. Based on my experience with that company, I would strongly advise against submitting your gun to them for repair. I don't know how their tech department is organised, and I haven't spoken to Jon personally. My comments are only in reference to Wolf Armouries the company, not any single individual. But in my experience of their technical work, it is severely lacking. I've been itching to say this exact same thing in this thread for a while now. There are a few quirks which can be learned in a day of tinkering, but it's still just an AEG
  19. Tacitus

    MagPul PTS MASADA ACR

    Let us know if you manage to buy directly from Redwolf UK. I thought they only sold to retailers but if not they could be a great source. Wolf Armouries is really nothing special, and the gunsmiths there don't know much at all. But it's the only airsoft shop in London so you might as well check it out. Glad you've invested in Siegetek gears. They're probably the best single product I've purchased for airsoft. Of the proprietary parts in the Masada, only the air nozzle and hopup nub cannot currently be easily upgraded. I've read about a method used to install an o-ring into an air nozzle, which should work for the Masada, but I don't have a decent lathe with which to try it. Apparently someone tapered the hole and glued an o-ring inside the opening, which should produce the same result as a normal airseal nozzle. I might try the method with an old air nozzle I have lying around to see if I can do it, and then carefully try it with the Masada nozzle. They are the strongest gears you can buy. Nobody has reported breaking them. They also have some nice design features which make them superior to other gears. I should warn you not to buy them from a shop in Denmark called 'Airsoft Performance", run by someone on Airsoft Mechanics called 'Ringsted'. They resell Siegetek gears, but I was sent a faulty gear which did not fit in the bearing. It took a two months to finally get a working gear sent, including being ignored for two full weeks and having the owner be very reluctant to replace the faulty gear. At first he told me to modify it myself. Only after speaking to the manafacturer did he agree to replace the faulty gear with a working one. He actually wanted to just grind down the original gear and send it to me, but I argued that I paid for a brand new, working gear so that's what I should recieve. It ended up being the worst experience I've ever had with any retailer, let alone in airsoft. Always make sure you buy directly from the manafacturer, who has his own sub-forum on airsoft mechanics.
  20. Tacitus

    MagPul PTS MASADA ACR

    I don't have any, but I can take some. It's not very pretty in there but it all works. Is there anything specific you'd like to see? I don't have the space to do proper accuracy tests, so I don't know if the hopup even needs upgrading. The nub is intergrated into the hopup unit, which I haven't opened up yet as I still need to buy a 4mm roll pin punch, so I can't say how easy it would be to replace with a regular nub. I only know this because I took the microswitch apart to see how it worked! I'm one of those people who has to take everything apart I'd still be wary of a gunsmith who favoured modifying a microswitch over installing a mosfet though. The benefits of a mosfet are just too great to justify fiddling about with a miscroswitch, in my opinion. The cut-off lever is also proprietary unfortunately, but without having it in front of me I can't say if it's the cause of the problem. The whole trigger/fire selector design is actually very poor, and there are many possible causes. Loose manafacturing tolerances being a major concern. Yeah, some people have had bad experiences with SHS gears, myself included. I actually started an almost identical topic to the one you linked to, Anakchan. I should have been more specific when suggesting them: They are very affordable, so can be worth experimenting with if you don't want to fork out $100+ for a set of Siegetek gears. If they do break, it's the gear axle that goes so it can be replaced with a different axle (from a TM gear for example). I haven't seen any reports of the actual teeth breaking. Reports of axle failures have dried up now, so it may have just been a bad batch. I'd buy them again for a budget build, but if I can afforf it I'd go for Siegetek every time. I don't think anyone has broken Siegetek gears, at least when using them for their intended purpose. They also have some very nice design features. That doesn't sound too optimistic to me. If you don't want to get your hands dirty with upgrading and tuning it yourself, a decent gunsmith will be able to reach that power level reliably. How long are you in London for? I actually live in London, so if you brought your Masada gearbox with you, I could actually upgrade it for you while you're here. I don't think Red Wolf UK sell directly to the public, but there are plenty of retailers here. Unfortunately they are fairly expensive, and don't sell the cheap Chinese products I like to use, so I prefer to order from eHobbyAsia to save money. Orders usually take only 7 days to arrive so this might be a feasible option for you too. While you're in London you might want to visit Wolf Armouries in Camden. It's nothing special and overpriced, but they have a few nice bits of kit lying around. Similar to mine, apart from the 'fet. Have you installed the gearbox, hopup and bolt release sensors for your Scorpion? I've wanted to try out an AWS 'fet for a while now.
  21. Tacitus

    MagPul PTS MASADA ACR

    It's unfortunate that your Tavor microswitch caused such problems, but it's very useful for Masada owners to know about! The microswitch is actually mechanical, and not electronic. If your gunsmith can modify the switch with thicker metal, it will decrease resistance thereby increasing the current it can handle. It does seem like an unnecessary modification however, considering that a MOSFET would bypass the microswitch completely while providing other benefits. I'd be suspicious of a gunsmith who felt he didn't have the skill to install a MOSFET in the Masada. While it's more complicated than some guns, it's easily possible as the handguard area is very spacious for extra electronics etc. I have a SW-AB LONG from Extreme Fire, with some extra electronics I've added to power my internal LED tracer unit. Systema gears are notoriously weak, so I would avoid them. When they fail they can take other parts with them due to loose pieces of metal getting caught between other moving parts. Again, there's more info on this at AirsoftMechanics.com. I would recommend forking out the money for a set of Siegetek gears, but people have had good results from the cheap SHS/5KU/Element gears (all the same product, rebranded). I don't know what your target FPS is, but I'm not knowledgable enough to say what power level might damage the gearbox structurally. You may well be able to go higher than a PDI 190% spring, but you will have to check ASM (linked above), research it, then make an educated guess based on information on V2 gearboxes (or even better ARES V2 gearboxes). You should also be aware that you can gain higher FPS simply by improving the airseal, so that should be your first goal if you want to use a slightly weaker spring. Teflon tape around the cylinder head, and around the hopup bucking will prevent airleaks at those points. Unfortunately the proprietary air nozzle has no O-ring inside it, presenting an airleak with no easy solution. You might be able to modify an airseal nozzle designed for a different gun to work in the Masada, such as this one after tapering the end to actually fit inside the bucking. Also I found the stock O-ring to cause too much friction inside the cylinder. I replaced mine with a stock TM O-ring with great results. Let me know how your upgrade progresses.
  22. Tacitus

    MagPul PTS MASADA ACR

    What problem have you encountered with your Tavor? The cylinder head is unfortunately also proprietary, which I forgot to mention in my review. This is due to the length of the cylinder head nozzle. Luckily it's not a part which needs upgrading, as a perfect airseal can be acheived by wrapping some PTFE (Teflon) sealing tape around the cylinder head. The Systema silent piston head is a bad choice, so I would discourage you from buying it if you haven't done so already. It is not supposed to be used with normal cylinder heads due to the shape. It's too heavy (heavy piston assemblies are to be avoided), and lastly it's overpriced like 99% of Systema's product range. As far as I'm aware, it's very difficult to crack a gearbox unless you're unlucky and recieve one with a manafacturing defect, or you are running a very high power setup (for which careful tuning is crucial). The PDI 190 is a relatively weak spring so you will probably not crack your gearbox with it, but other parts may fail. I don't know what other parts you plan to upgrade, but I doubt the Masada could pull that spring at a decent rate of fire, or last long before something breaks. I wouldn't expect the magwell screw holes in the Masada gearbox to affect its durability at all, as they are well away from the cylinder window (the part which cracks when a gearbox does start to fail). But I'm far from the best person to comment on the durability of gearboxes. Head over to the forums at AirsoftMechanics.com and run some searches on gearbox durability (and look for info on a decent piston head too). All the information you need on airsoft is already on that forum. You don't even need to start a new topic. The Masada gearbox is similar enough to the V2 gearbox that information you find on the V2 will largely apply to the Masada gearbox in terms of design. As for durability I don't think anyone has done actual tests, and I don't think you'd be able to persuade anyone to run tests, as the only way to get a new shell would be to buy a new Masada. There are a few steps you can take to minimise stress to the gearbox shell, but without any scientifically obtained data on the durability of the shell, you'll have to just do your best and see how it goes.
  23. Tacitus

    MagPul PTS MASADA ACR

    I don't know why the barrel has been described as 14.5in, maybe to mimic the RS version? As for the actual inner barrel length, you appear to have answered your own question. However, I don't think there are any precision barrels available at that exact length, so you will have to buy a shorter barrel. The closest I can find is an M4A1 barrel at 363mm long. You will still see an improvement despite the shorter length (assuming that the stock barrel can be improved upon, which is probable considering the quality of the rest of the internals). In airsoft, barrel length doesn't affect accuracy as much as with a real gun. The important factor is the consistency of the inner diameter along the entire length of the barrel. PDI and Madbull make good barrels, Madbull being my choice as they're cheaper. You also have to make sure the cylinder volume is matched to the barrel length, but with such a small difference between the stock Masada barrel and an M4A1 barrel, you might be fine sticking with the stock cylinder.
  24. Tacitus

    MagPul PTS MASADA ACR

    That's very interesting. I think mine has a similar problem, but related to the fire-selector: When the fire-selector is set to semi (12 o'clock), the trigger must be pulled all the way back (and squeezed quite hard) to activate the microswitch. Setting the fire-selector a few degrees to the left of semi-auto (about 11.5 o'clock) is needed for normal trigger operation. It's annoying, but I haven't looked into fixing it yet as it's easy to work around. It's a shame that the whole trigger/fire selector/semi auto cutoff mechanism has been so poorly designed.
  25. Tacitus

    MagPul PTS MASADA ACR

    Can you take some photos to demonstrate what's going on there?
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