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raz-0

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Everything posted by raz-0

  1. We should be happy. This is so badly done that the odds of it being overturned are pretty solid. I mean it goes DIRECTLY against stuff already said in heller.
  2. Wow. the amount of wrongness in this thread is staggering. Force = Mass x (Velocity squared) It's that simple. The pressure of the cartridge doesn't matter. The amount of stuff coming out the front of the gun will impart a pretty consistent amount of energy to the gun regardless of how you divide up the mass between powder, projectile, and the velocity thereof. Beyond that, you are into the psychology of perceiving recoil, and that is a lot like questions of ergonomics int hat it is largely a matter of taste. Objectively, if you want the least amount of energy, you load light loads with light bullets going as slow as you can manage, and do so with a fast burning powder with the least mass. And when I say fast burning, I mean sufficient that combustion is complete by the time the bullet leaves the barrel to minimize jetting. You do this with the heaviest gun you can tolerate for the smallest amount of mass coming out the front you can tolerate, and your gun is not a fixed barrel blow-back design, but some delayed unlocking design. Beyond that you are managing perception. Heck even within the above you are managing perception. 2 Alpha is also wrong about sight picture. Just go ask steel challenge shooters. If you want to go really light, you just respiring your gun for the load, or shoot a revolver. Heavier bullets move slower, and to reach a given agreed upon amount of energy at muzzle, you need less powder. Since velocity is squared a slower bullet is a good thing, but more importantly, less gases and other powder remains shooting out the barrel at 5000fps is a good thing, and bigger bullets require less powder. But that is only if you are trying to meet a specific amount of energy out the front for competition or terminal performance in self defense or hunting. Freed from those constraints, 2gr of powder X behing a 100gr bullet will be softer than 2gr of powder X behind a 200gr bullet because there is less stuff coming out the end of the gun. Then you get into where physics meets psychology: The first is sound - Most people perceive a louder muzzle report as implying more recoil. You can take two rounds that produce the exact same muzzle energy, but if one of them is a lot louder, or produces a pressure wave you can feel, you will get more people telling you that gun recoils more. This is another reason why many people prefer heavier bullets. For a given amount of muzzle energy, heavier bullets remain subsonic, and are quieter. However, remove that restriction, and a subsonic bullet of less mass will still induce less recoil than a subsonic bullet of greater mass. Then there are comps. In terms of gun movement and stresses on teh shooter, a properly designed comp is ALWAYS a recoil win. However, they make the gun seem VERY, VERY loud. Some people will perceive this as more recoil, some people won't until it induces a flinch and despite less recoil will perceive the whole package as less controllable. The second is torque - heavier bullets torque the gun more because the heavier bullet has more inertia. How much you perceive the torque comes down to you and the mass of the gun. The end result though is that for people who DO perceive the torque, you notice you are actually controlling the gun's movement in more directions, and since you are consciously controlling more inputs, you perceive that as more recoil. The third is impulse duration - Your brain processes reality very very oddly when compared to the reality of physics. In general, the shorter the recoil impulse, the more people will perceive the reduced duration as feeling like less recoil regardless of the math. This is NOT 100% of people, and even for people it works on, there is usually a threshold. Myself, I like the feel off titiegroup, right up until there is a point of inflection on the benefit curve and it goes form imnproving to becoming rapidly worse. Somewhere between 4.5 and 4.7gr of titegroup under a 180gr bullet in .40 is that point of inflection for me where the recoil gets that jolt like I'm actually whacking something with a hammer rather than shooting a gun (unless I shoot it in a nice heavy gun). It's distracting and fatiguing, so if I need to go above 4.5gr to make major in.40 with a 180 out of a gun I either don't shoot that gun or I switch powders to something slower. Then you run into frame material. Polymer guns flex, which spreads the energy distribution to your body over a longer time. You will find that if you mix a fast powder with a polymer gun that flexes, most people will find it feels softer. It is also converting some of that energy to heat and sound, but it's relatively small in the math of it. I debated putting this under the next section cause it can fit here or there... Fourth is springs. - Other than the small bit of heat and sound they generate, they don't really reduce recoil energy, they at most mess with the distribution of the recoil energy over time and weather you pay the piper more at the beginning or end. Your bullet produced X enery, and imparted Y amount of that into the slide of your gun. You put a light spring into the gun, it slams back harder, but slams forward lighter. Put a heavy spring into it, the backwards motion will be damped more, but it will go back into battery hard and may cause your muzzle to dip. A good chunk of people regard removing that slam as the slide hits full reward to make recoil feel reduced. A good chunk of people also feel that recoil feels minimized when you balance it so you split the slamming motion pretty reasonably between the slide fully reward and slamming back into battery. Mainspring weight comes into it as well on hammer fired guns. IT gets complicated.
  3. IMO there's only three coatings to consider. 1) standard phosphate with appropriately chromed bits. Decent and cheap. Corrosion resistant and a known quantity that works. 2) nickel boron. It's hard, slick, and doesn't flake like regular chrome. The only question I haven't found an answer to is if it is subject to the risk of hydrogen embrittlement like a normal chrome plating process. Even if it is, there doesn't seem to be rampant issues with chrome plated bolts so I don't worry about it to much. It's not magic though, as baked on carbon will stick to it almost as much as it will to chrome, and you still need tools to clean the chrome lined bit of the BCG if you leave it long enough. Same applies here from many first hand accounts. It also can discolor under heat similar to stainless steels that get that blue and pink sheen, but slightly different. normal chrome doesn't seem to do that. 3) melonite or melonite QPQ over a properly polished surface prep on NON-stainless ferrous metal. In this situation it cleans easier than phosphate, is very hard, and on non stainless steels it provides corrosion resistance. It also has no dimensional change because it si a chemical reaction that alters the surface rather than a deposited coating. Biggest risk would be on AR bolt lugs as any defects that could cause stress cracks will be exacerbated by the high temp treatment. As for other processes 1) NP3. this is a nickel chrome coating modified with teflon. PTFE + the temps in a rifle (in the barrel, BCG and DI gas system) strike me as a bad combo for the PTFE not burning off or breaking down as max operating temp for PTFE is 525F. In fact, outside of treating bits of trigger groups with it, I can't find an appropriate application for this stuff. I've encountered it on magazines and slides as well, and it's just too damn slick for things where fumbling due to poor grip is ever a concern. Once the coating fails, it tends to start flaking, much like normal chrome plating. 2) Nitride. That's a VERY broad term. Melonite is a molten salt nitriding process, as is tennifer. Ion bond Diamond Black is a PVD low temp nitriding process. It is very hard and like all the ones in the above section, if the coating is breeched, it doesn't tend to flake and spread the breech. It also provides no corrosion resistence as it is essentially a sputtered coating, and really doesn't offer ocntinuous coverage. However, due to this, it DOES seem to hold lubricants pretty well provided they don't evaporate easily. The Gold TiN finish is a similar process. For other molten salt processes, you have to look at the tmeperature of the bath, and the nature of the salts and chemical reaction with the substrate. The only real concern in common with them is that molten salt baths are hot, and any part that is thin can become brittle due to the bath effectively over hardening it via heat treatment (for example Melonite usually involves a pre heat to about 800F and the bath is about 1100F). IMO nothing on a BCG is something to be concerned about for this. The various PVD nitride processes are IMO a waste of money. The only thing they bring to the table is if they are used to treat a polished finish, they wil help preserve the smoothness as long as the underlying metal isn't too soft. Other than that, they look pretty while doing no harm. 3) Hard chrome. It can flake, and it can induce hydrogen embrittlement. There is a recipe to deal with that which involves a post plating baking session, which the AR bolt and carrier are good candidates for it being easy to do. Like I said, I haven't seen a spate of failures on chrome bolts, so I'm assuming the makers are doing this. It can flake if you manage to damage the coating, and thus the damage spreads. The flaking can cause the rifle to suffer operational malfunctions. Quite a while ago there aws a batch of DPMS chromed BCG with this issue. My personal opinion is I'd consider nickel born and melonite on the carrier, and stick to phosphate on the bolt.
  4. Cool, can we do this with Alcohol and Tobacco too. I don't drink or smoke, and frankly in terms of health tobacco is pretty awful, and in terms of public harm alcohol couldn't be better designed to be #1 as one of the primary features is increasing punishment suppressed behavior.
  5. raz-0 replied to EWC88's topic in General Discussion
    The cult of rianbow. It's like cleaning your carpets with a bong. You know smoke is a particulate, and it somehow makes it through bongs and other water pipes. Rainbow is MLM with armies of unfortunate squeegee people being taken advantage of, and scammy financing at a usurious rate. But if one must, the refurbs of the old school metla flake tortoise shell household shop vac lookin thing can jsut go to overstock.com for one at about $600. Just some food for thought. As fro the dyson, I'll give a few pieces of advice. 1) they have too much suction for area rugs. I have a 9x12 that is a PITA to clean with my dydson because it lifgts up near the edge. 2) don't bother with the all floors version. It has a motorized beater bar, but it is pretty weak, makes it hard to get under toe kicks and furniture, and it's not really needed. It produces enough suction to make the air powered carpet tools work very well (I slapped the air powered stair attachment form my hoover on it for grins because with the hoover it was the most useless device ever. The thing worked except for the fact it couldn't pass enough air for the dyson and the dyson started sucking air through the seals elsewhere). 3) The only difference between the animal and non animal versions of any given model is the carpet attachment that comes with it, the labeling, and the color. You can buy the attachment separately, so the refurbs on woot or what have you are GTG even if you want an animal. Just buy the tool to turn it into an animal.
  6. Yes, back when the policy said blocking a magazine was OK, they did. Then Corzine took office and despite court rulings, reversed this and sent out the gestapo to lean on retailers. They also failed to maintain their bound book due to some guns going walkies. This was within BATFE tolerances, but the state did not let them renew. And thus sarco moves to PA.
  7. Yeah, but keep in mind when they say cheaper, they mean about 1/3 of the price, which would put it about $3-4 at least if you aren't talking big shipping areas on the east coast. Maybe up to $6-7 if you are talking middle of the country. It's also metabolized rapidly (it's desomorphine), and your high lasts about 60-90 minutes. Heroin is 4-8 hours. I also suspect that the floor to pricing of desomorphine in the US is kind of high due to the fact you can't get OTC meds with codeine in them, and thus you are paying a premium for illegal ingredients. You also can't whip up a batch DIY style like you can making shaker meth (it's more like meth lab meth) Per hour of high, heroin is cheaper here. Not to mention that what they are likely actually making is a witches brew of codeine, dihydrocodeine phosphate, hydrochloric acid, red phosphorous, and various salts of both. Then cause the stuff is corrosive like meth, and you need a fix every couple of hours, you rot out your veins and then start doing skin pops, which will give you some nice skin issues you won't heal from over time, and once again add the corrosive leftovers and you mess yourself up. Now you go into chicago or detroit where the heroine is a lot less pure, costs more per hour of high, and canada isn't that far away with OTC meds with codeine in them, and you may have more of a problem. For $5, you can get a hit of heroin, or a hit of krokodil and a cup of coffee maybe. Most of the news with cases being tagged as krokodil are in the middle of the country where the heroine is stepped on hard and expensive to boot, and you have a meth industry looking for something that is less open to DIY processes.
  8. Man, my family stopped there when I was about 8 on a trip to Maine. Really big stores are more common place now, but I recall being pretty amazed at just how huge the place was back then.
  9. Given that high grade heroin is less per dose here than a beer at a bar, hitting a big price advantage is hard.
  10. Probably not though. Infectious disease inside your defenses that has you minting zombies at home is pretty damned bad.
  11. I'm pretty sure they'd lose some sleep if that happened and it didn't negatively impact the population's access to firearms one bit. I think they'd go ballistic if it allowed us to also bypass nj nics.
  12. Exempt the police and give themselves immunity to lawsuits. Oh wait they already did.
  13. Some things are better, and some are worse. I'd argue a lot of the better things are ultimately frivolous. Some of those better things have a distinct level of badness buried underneath. To pick something apolitical, I'll use the smart phone as an example. They are cool and useful, but they are also The cause of a lot of traffic accidents. They foster communication with people you otherwise might not communicate with, while encouraging you to ignore the people around you. They have lowered the cost of a lot of useful software and fun entertainment, but have moved you into a market you don't get to decide how you use it, or if you can use it. They provide access to gobs of useful info, while inherently putting information that used to be secure/personal/unavailable at risk. They have grown in popularity so fast that they are a ubiquitous and well supported technology already, but that has also caused alternative options for a lot of tasks to become unavailable. Which means you are stuck with the abuse of your information by government and companies, with the only option being to abandon certain things altogether. They are cool as heck, but they also encourage you to choose cheap easy entertainment over real relationships, learning useful skills, and developing your talents. This is not a new problem, but we also never had this level of access to pushing the fun button as an alternative to something harder. The tv and Internet didn't follow us everywhere we go every waking minute.
  14. raz-0 replied to Down South's topic in Rifles
    There's rare, and there's desirable. If there aren't a lot of buyers searching for it, it's just an oddity. Sometimes not even that. If 10,000 of some variant of something there were millions made, and the market for that uncommon item is only a few hundred people now. It's technically rare, but the market for it is pretty saturated and you'll always find one for sale, probably pretty cheap too. Take the Remington 700. There are all sorts of variants and limited special order runs, but there's not really any specific demand for them and the value of them is pretty much capped at the retail price of a similar new bolt gun.
  15. I've had it to some degree as long as I can remember. There was an interesting incident when I was 4 or 5 where I got into a nice long argument about silence being a particular sound. For some folks, a nutritional supplement can make it go away because you are one of a group of people who don't produce a certain chemical compound, and the supplement metabolizes to that compound. Basically if it helps you take it forever as it comes back when you stop. No dice for me, but I also subjected myself to lots of loud concerts in my teens and twenties.
  16. I want the trigger by wire. I'm petty sure that it could be turned full auto REALLY easily. Or better yet, burst fire. What the BATFE can grant, they can take away. Even if it does come to makret and the AG declares the smart gun law in effect, it creates an huge aggrieved class to take that law to court.
  17. Actually you can. There is federal law about what it can and can't be used for lawsuits work. About a year into my tenure at rutgers as a student, they got their ass handed to them regarding use of ssn as student Id numbers. The same laws are why the ssn is optional on nics.
  18. I added some no shoots, moved the left side targets out, and made the box not FFZ because otherwise there's no reason for a box.
  19. The difference between the two is largely heat treat. In the end, 9310 can be made harder, but is less ductile at full hardness, and you can through harden a thicker piece of metal than 158. Said thickness for both is thicker than the diameter of an ar bolt.
  20. There's regulations on how one ships large quantities. I mean large, hence not of much meaning unless you are going to be selling a whole lot. For high volume users, If you buy a lot of powder and primers, you may actually run into issues where you really aren't supposed to be going over certain bridges. For the random jug? No, no real issues.
  21. I actually kind of like this one. Although I'll have to check it against the requirements for a standards stage. The other issue is it is short. You have to stick it in a pit with something else or run all short stages.
  22. We do not have enough disappearing targets.
  23. To design and submit. As it is I'm going to be stuck designing three this weekend. You bitch about the match and stage design. Don't like them design. Don't like them and the rules start your own. I have yet to see one good reason for heads up. It boils down to people whining about prize tables and who is or isn't shooting against them. You want free crap, get a sponsor. Oddly enough that seems to be an indicator of actually being really good. You want to prove you are better than a particular person, call them up and challenge them. Oddly enough the heads up crowd tend to never run matches.
  24. As an experiment, I challenge you to design a stage. No? Guess what a heads up stageless match shoots like. I mean seriously, nothing but one pro football league, baseball, etc. That's the one true way, everything less is just the pussification of America right? There is no farm league, it's embedded in the match. Get over it.
  25. The change in construction of pmags won't permit that anymore. I'd be up for a couple.

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