n***b
发帖数: 5914 | 1 【
估计除了现役/退役海军陆战队成员才会觉得是好片......
不堪入目的地方很多：
1. 外星人的武器装备居然跟地球人一样落后（子弹,火箭炮,projectile 炮弹);
2. 地球人的匕首/刺刀/手枪/步枪/手榴弹就可以把穿着盔甲的外星人干掉；
3. 整个片子都没看到特种兵、陆军、海军和空军;
4. 除了运输直升机, 传说中的f-16、f-18、f-22、f-35、黑鹰直升机、阿帕奇直升机都
没有出
现；
5. 外星人母舰被7、8个海军陆战队士兵轻易发现并且快速干掉;
6. 巡航导弹要靠士兵用laser gun 近距离定位;
7. LA 失陷居然没有动用核武;
相比高中年代的《独立日》，《LA大战〉就是个烂片. |
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f***e
发帖数: 5443 | 2 中新网12月9日电 据美国媒体报道，由于不满大陪审团对弗格森布朗案和纽约“锁喉”
案涉事警察不起诉的裁决，全美示威游行已经蔓延东西海岸多日。加州当地时间8日连
续第三晚出现大规模骚乱。在伯克利，上千名示威者走上大街游行数小时，并涌入高速
路，造成80号洲际公路被迫关闭，还有示威者走上一处火车站，躺在铁轨阻止火车运行。
8日晚，伯克利的示威者在前往火车站之前，先在警局总部与防暴警察对峙。随后
前往一处火车站致使车站关闭。示威者继续从大学路往西行进，在进入80号州际公路一
条四车道后，公路两个方向都被迫关闭。
防暴警察封锁了高速路，示威者则试图绕过警察进入高速，一开始没有成功，但随
后示威者占领高速，并阻止了两个方向的交通。
数十名示威者还前往铁路，并拦下一辆火车。
一名41岁在加州大学伯克利分校工作的男子伍德下班后加入示威游行，他在采访中
称：“因为我厌恶透了警察的暴行。”
他称当他看到两名手无寸铁的非裔被警察枪杀的新闻后，感到很痛心。他称这种事
情不应该发生在任何种族身上。
不过比起7日晚上的骚乱，当晚的示威要和平很多。
伯克利市长贝特斯在当晚称：“伯克利的人们对弗格森和纽约所发生的事... 阅读全帖 |
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s****y
发帖数: 18685 | 3 SALT LAKE CITY - ESPN College GameDay is coming to the University of Utah th
is weekend, with a variety of shows airing from Presidents Circle starting a
t 10 a.m. MT Friday and concluding at 10 a.m. Saturday. All events are free
and open to the public. No. 5 Utah will host No. 23 California Saturday at 8
p.m. MT in a game that will be televised by ESPN.
ESPN will begin broadcasting shows from Presidents Circle on Friday from 10
a.m. to 3 p.m. MT
with a live show scheduled from 12:00-12:30. It w... 阅读全帖 |
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S**U
发帖数: 7025 | 4 Hockey puck is also not spherical, but a disk.
http://en.wikipedia.org/wiki/Hockey_puck
Rugby and American football are also not spherical.
My guess is any sports that uses a projectile with round cross-section can be called “球”in Chinese. It is almost always the case, as the shape is
fully symmetric in 2 dimensions and somewhat aerodynamically stable (when spinning around the axis), making it more playable.
In contrast, a dart doesn't have a round cross-section, and can't be easily played back ... 阅读全帖 |
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T******g
发帖数: 21328 | 6 大概能看出来威力指数
7.62mm Tokarev (7.62x25mm) -- 85 gr FMJ, 1550 fps, 453 ftlbs. Sellier &
Bello
9mm Luger (9x19mm) -- 124 gr JHP, 1120 fps, 341 ftlbs. Speer Gold Dot SOC
45 ACP (11.43x23.5mm) -- 230 gr FMJ, 869 fps, 386 ftlbs. M1911 ball
7.5mm Swiss (7.5x55mm) -- 174 gr FMJ, 2560 fps, 2533 ftlbs. Ruag surplus
7.62x39mm Soviet -- 123 gr FMJ, 2300 fps, 1445 ftlbs. Norinco,
7.62x54R Russian -- 150 gr FMJ (steel core), 2700 fps, 2429 ftlbs. surplus
全部见下
http://www.geocities.com/alancook.geo/ammo.htm
。。。
Am... 阅读全帖 |
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N******p
发帖数: 2777 | 7 I am not an expert, but I would imagine it's much harder to make a firearm
as accurate as todays top air guns. For one thing, the energy of a live
cartrige is much greater than the compressed air that propells the pellet,
which causes more flex and vibration of the barrel before the projectile
leaves the barrel, and the slight variation from one round to the next will
be magnified by the flex and make the group to open up. With proper pellets,
any competition air pistol is capable of shooting on |
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N******p
发帖数: 2777 | 8 说了半天，你这还是靠一张十米靶的图直接放大缩小弄出来的阿。不够好了，我下面这
个Matlab script可以计算不同距离下的各环大小（弹径影响已经考虑进去了）。
至于气步枪靶，如果考虑到弹径影响的话，在七米远十环不是一个点，而是 -1.5mm，
这种情况下十环是打印不出来的，只有用outward scoring gauge才能看是不是打中十
环了。
% Projectile radius (mm)
r = 4.5/2;
% Full-size target score ring radii (mm)
R = [5 11.5 27.5 43.5 59.5 75.5 91.5 107.5 123.5 139.5 155.5]'/2;
% Full-zie bullseye radius
BE = 59.5/2;
% Full-size distance (m)
D = 10;
% Reduced distance (m)
Dx = 7;
% Reduced target score ring radii (mm)
Rx = (Dx/D*(r+R) - r);
% Reduced bu |
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M*j
发帖数: 3534 | 9 这差不多是我见过的最低价了，和我屯的均价持平23～24c/rd，算上了S/H
The
projectile. |
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f******u
发帖数: 767 | 10 There are many different kind of alternative shotgun shell for different
situations. Bean bags, rubber balls and even rock salt have been used as
projectiles of shotgun ammo in crowd/riot control and HD situations.
You can put just about anything in a shotgun and call it ammo. Here is a
list of some of the wacky ammunition produced commercially,
Avenger: Hollow steel balls with a low gunpowder load.
Bird Bombs: An explosive payload, which (in theory) detonates on impact.
Roughly equivalent to an |
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h*******m
发帖数: 253 | 11
到我这里来买好了
spikes tactical M4LE：
m4 basic profile w/m230 attachment cut out in the barrel
chrome line and chrome chamber w/ 1:7 twist rate to stabilize heavier
projectile (55ok, best for 62-77 gr.)
true 5.56mm chamber
虽然mp15的名气大，但是它不是true 5.56 chamber, which means it may or may not
chamber a 5.56mm round. 1:9 twist means it will not stabilize anything
heavier than 60gr, meaning tumbled side impact on the target. 最主要的：我发
现新的mp15好像都是chrome line, chrome chamber。 |
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T******g
发帖数: 21328 | 12 看起来不错呀，不过我准备上EVO 4G了，不知道android上有没有类似的
Ballistic: Field Tactical Edition is the field firing version of Ballistic,
designed for law enforcement and military personnel with hardened, recoil-
proof mounting equipment. The FTE version of Ballistic includes all of the
great features you'll find in the standard version of the software, plus an
advanced head-up display for mounted weapons operation. The HUD provides
real-time angle acquisition, one-touch atmospheric correction, and scroll
wheels to qu... 阅读全帖 |
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f****a
发帖数: 4708 | 14 步枪子弹没禁，但是很多网店不卖了。
Willing to ship rifle ammunition to CA (whatever rifle ammunition is defined
as):
Ammoman.com
Ammunition To Go
Cabela's
Century International Arms
Civilian Marksmanship Program (CMP)
Dan's Sporting Goods
Exile Machine LLC
Georgia Arms
Glen's Outdoors
Graf & Sons
J&G Sales
Military Shooters
RM Ammo
SG Ammo
Willing to ship handgun ammo (and rifle) to "exempt" citizens of CA (i.e. C&
R FFL holders with CA DOJ COE, LEO's, CA FFL's):
Ammunition To Go
Century International Arms
Civil... 阅读全帖 |
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k*****G
发帖数: 697 | 15 多谢firerain24，zhangtao9703。
第一次购枪，看了看Federal和state的法律。Federal law比较清楚，有了Hunting
License非公民非绿卡就可以买枪拥枪。VA的法律比较模糊，似乎连手枪都是非法，跟
周围情况似乎不符。哪位有经验能解释一下？关键是最后一段，好象手枪也是assault
firarm对非公民非绿卡为非法.
http://leg1.state.va.us/cgi-bin/legp504.exe?000+cod+18.2-308.2C
?18.2-308.2:01. Possession or transportation of certain firearms by certain
persons.
A. It shall be unlawful for any person who is not a citizen of the United
States or who is not a person lawfully admitted for permanent residence to
knowingly and intent... 阅读全帖 |
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M*******n
发帖数: 1165 | 16 是一种基于锆的子弹，单shell就5 USD，而且由于产生后座不足只能在手动action上用
。应该是有些州禁了这种子弹...
Dragon's Breath
Dragon's Breath at night
A Dragon's Breath usually refers to a zirconium-based pyrotechnic shotgun
round. When the round is fired, sparks shoot out to about 5 m (20 feet).[1]
While it has few tactical uses, the visual effect it produces is impressive,
similar to that of a short-ranged flamethrower. The pyrotechnic shell is
expensive compared to other shells, costing around 5 US dollars per shell.
Because it is a very... 阅读全帖 |
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f*********n
发帖数: 11154 | 17 这篇里面有很多有用的信息：
http://www.gunsandammo.com/2006/10/14/shotguns-for-home-defense
If there is one handheld weapon that is more likely than others to offer a
one-shot stop of a hostile opponent, it would be “the gauge” or “12
banger” as it is known on the street.
One of the things I heard over and over from prisoners was their respect for
and fear of the shotgun. One inmate who was incarcerated for murder and
drug-trafficking charges told me “A determined man with a ‘gauge’ should
not be messed with.... 阅读全帖 |
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f*********n
发帖数: 11154 | 18 http://www.6mmbr.com/308win.html
A 1:10" twist rate will let you shoot the popular medium and heavy 30-
caliber bullets up to the 210-grainers from Berger and Sierra (provided your
barrel delivers enough velocity for the heavy bullets). A ten-twist can
also work well with the lighter projectiles. John Whidden, who won the
recent U.S. Palma Team Trials, has had great success shooting 155gr Bergers
with a Broughton 10-twist 5C barrel. A 1:11" twist, found on many factory
rifles, is a good compromi... 阅读全帖 |
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f********t
发帖数: 4574 | 19 Massad老爷子如是说，40 S&W最流行，然后是357 Sig和45 ACP
Choose your ammo...police style
http://www.backwoodshome.com/articles2/ayoob93.html
Experience has taught police that what actually happens on the street is
more important than what happens in the artificial environment of the
laboratory. The 9mm round now acknowledged to work the best is a 124-grain
to 127-grain high tech hollow point at a velocity of 1250 feet per second.
NYPD, with some 30,000 officers carrying this type of ammo, the Speer Gold
Dot +P ... 阅读全帖 |
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a*****9
发帖数: 805 | 20 The cannonball bounces like a football....
The test was to see the cannon can penetrate the castle wall, and looks like
the penetration is pretty good as an FMJ projectile. :)
Best of all it didn't hit anyone.
Worst of all, this EP wont be on air...
http://www.wired.com/underwire/2011/12/mythbusters-cannonball-m |
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f*********n
发帖数: 11154 | 21 叫Breaking Through, A History of the FBI's Ballistic Research Program，
其中对1986年的迈阿密枪战后改选子弹做了一个简单的描述：
Then came what would forever be known as “The Miami
Shootout.” On April 11, 1986, agents of the Miami office tracked
down two armored car robbers who had already embarked
on a crime spree that included robbery and murder. In the
resulting shootout, both subjects were killed, but not before
the deaths of two brave Special Agents and the wounding of
several others. After the official inquiry by head... 阅读全帖 |
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X***y
发帖数: 3947 | 22 我真是躺着也中枪啊。最近没跟这个系列。Hulu上应该有吧？
我同意节目里的槛儿绝对是有导演安排的，否则三枪玩儿家真的就占统治地位了。谁让
人节目叫top shot呢。能射projectile都得练啊。这可能也是我不太跟得原因。
至于俩男追一女这种广大红脖群众喜闻乐见的娱乐元素兄台就别不厚道地吐槽了吧？
while in rome嘛。
插个题外话，最近才发现那个所谓Magpul持枪法，其实是Bennie Cooley首创的。 |
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d**e
发帖数: 1124 | 23 1：twist should be able to stablize 75gr or more
i suppose accuracy depends on balistic projectile attribute - how far is the
target you are shooting at? 100yd, 200, 400? that will affect what gr you
pick |
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t******y
发帖数: 5040 | 24
，
查了一下这个300 AAC BLACKOUT 7.62x35,这玩意就是AR-15版的7.62X39嘛。
Full power 115-125 grain ammunition matches the ballistics of the 7.62x39mm
AK, and eclipses 5.56mm with much higher-mass projectiles for a more
dramatic effect on the target. Or choose subsonic cartridges for optimal use
with a sound suppressor - 220 grain Sierra OTM (open-tip match) bullets
vastly outperforms a 9mm MP5-SD in penetration and long range accuracy.
还真有亚音速的重弹头，这玩意值得研究一下。 |
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T******g
发帖数: 21328 | 25 新的7.62x39 upper设计上都没什么问题了，特别是加了extended m4 feed ramp
因为有一些上几代设计的mag，出的问题比较多，不过也是装弹到30发才容易出问题。
新的弹匣或者加州的十发限制应该都还好
其实300就是按照x39来设计的，指标其实还差点，毕竟Case小点，不过弹头BC可能搞点
http://en.wikipedia.org/wiki/300_AAC_Blackout_(7.62%C3%9735mm)
Project goals were:
Create a reliable compact 30-cal solution for AR platform
Utilize existing inventory magazines while retaining their full capacity
Create the optimal platform for sound and flash suppressed fire
Create compatible supersonic ammo that matches 7.62×39mm ballist... 阅读全帖 |
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S**********s
发帖数: 4534 | 26 for future reference, it is called cartridge or ammo/ammunition.
shotgun ammo is also called shells.
Bullets are only the projectile in the entire cartridge.
But enough with the lecturing. For personal defense use, any buckshot is
fine.
I personally recommend 2 3/4 inch, one ounce #00 buck, which usually comes
with nine .31 caliber lead pellets. The stopping power is equivlant to nine
.32 acp being shot in the same time. This is one of the most
Readily available loading on the market.
Smaller di... 阅读全帖 |
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h*********2
发帖数: 2508 | 27 有点长，但是挺好玩
After some years now of reading internet bulletin boards, I think I’ve got
the pros and cons of possible SHTF rifle choices figured out. Correct me if
I’m wrong, but the following is my analysis based upon the wisdom of
numerous gun board gurus (you know them, they’re always the first ones to
tell you a particular model gun is “junk” and enlighten you as to why they
have made the only logical purchases)…
The AR 15:
Great, awesome, unbelievable rifle(when it works). Can hit a fly in the... 阅读全帖 |
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k*******n
发帖数: 5546 | 28 The United States is the center of gravity for all things tactical. The U.S
market represents 90% of the world market and because of this the world's
premier weapons manufacturers have set up shop here in continental United
States to sell their wears to the military, law enforcement agencies and
private citizens.
However, after world events such as 911 there has been a huge demand for
weapons in the U.S. This placed massive strain on quality control systems of
weapons companies as demand overtoo... 阅读全帖 |
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d********e
发帖数: 2221 | 29 http://leg1.state.va.us/cgi-bin/legp504.exe?000+cod+15.2-915.4
§ 15.2-915.4 allows someone on private property to be able to discharge an
air gun as long as they have permission from the property owner to do so and
reasonable care is taken to ensure that the projectile does not cross the
bounds of the property. Any local ordinances to the contrary, which many
localities have adopted, are preempted.
Feel fortunate that LZ is in VA. |
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w*****o
发帖数: 1806 | 30 呵呵，老大不要吓我啦。 Fairfax county 1ACRE的限制可能以前存在过，不过现在
code里已经没有这条要求了。我是守法良民啊。fairfax VA 相关codes全文如下：
Section 6-1-2.1. - Discharge of pneumatic guns in certain places prohibited;
exceptions.permanent link to this piece of content
(a)
It shall be unlawful for any person to shoot a pneumatic gun in any areas of
the County that are so heavily populated as to make such conduct dangerous
to the inhabitants thereof, which areas are designated in Appendix J to the
Fairfax County Code. Notwithstanding the fore... 阅读全帖 |
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d********e
发帖数: 2221 | 31 老大你说的这是旧的法律了。VA 2011年7月1日开始的新州法如下，注意“Any local
ordinances to the contrary, which many localities have adopted, are
preempted.”
所以现在整个弗吉尼亚关于射击气枪的法律是统一的。
http://leg1.state.va.us/cgi-bin/legp504.exe?000+cod+15.2-915.4
§ 15.2-915.4 allows someone on private property to be able to discharge an
air gun as long as they have permission from the property owner to do so and
reasonable care is taken to ensure that the projectile does not cross the
bounds of the property. Any local ordinances to the contrar... 阅读全帖 |
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f******u
发帖数: 767 | 32 FYI
Here is just some extra information
"9mm" - Oh the beloved 9mm. Rappers dig it, Hollywood loves it, and we
know it's one of the best (watch this start a fight) autoloader pistol
rounds out there. What the hell is it? 9mm in common everyday speech is the
9x19mm NATO or 9mm Luger round. Do not be confused by ads or gun store
owners wanting to unload some POS on you because you're just lookin' for a "
9." The 9mm in the name, just like the 30 cals, is referring to the diameter
of the projectile... 阅读全帖 |
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P*****J
发帖数: 1745 | 33 这个去midwayusa转一圈就知道显然不对啊。我记得读到过退过火的蛋壳也可以把颈部
清理干净，不过军队验收5.56需要看弹壳口的退火环，所以M855, M193之类的都留着。
http://www.midwayusa.com/product/3317382405/blackgun-industries
"The 223 Remington loaded from BlackGun Industries is loaded with a 55 grain
M193 projectile in new Lake City 5.56x45mm NATO brass to 223 Remington
pressure specifications. Lake City brass is produced to Military
Specifications and is known for its high quality and consistency. This brass
does have the crimped in primer. All of the components th... 阅读全帖 |
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d*******s
发帖数: 15155 | 34 57. M55A3高机
Serbian M55A3 20mm Machine Gun (This is primarily an anti-aircraft gun
mounted onto light or armored vehicles or even rolled along with a trailer.
The cannons themselves are Hispani-Suiza HS .404’s which are French in
origin and were common during WWII. The one in the image is in use in Serbia
.)
58. M793 Target Practice with Tracer (TP-T) ,25mm
The M793 TP-T cartridge is a fixed-type, percussion-primed training round
with M28 link that matches the M792 HEI-T round ballistically.
The... 阅读全帖 |
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e***s
发帖数: 1397 | 36 仔细看一下，有AWB的时候，美国和其它大多数发达国家相比，对半自动步枪的管制都
要严格，管理要松一些的 - 我说管制严，管理松 - 因为美国不要license, 但是用一
些莫明其妙的限制管制了硬件。
现在纽约州通过的SB法律，结果是造成的管理和管制比大多数其它发达国家都要严。
希望纽约的今天不是美国的未来...
http://en.wikipedia.org/wiki/AR-15
AR15
Legal status of civilian ownership
Australia
AR-15 rifles, like all semi-automatic rifles, are subject to strong
restrictions of ownership in all states and territories in Australia. The
only means of legally owning an AR-15/M16-type rifle in Australia today
beyond law enforcement is to have a Categor... 阅读全帖 |
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c****x
发帖数: 1270 | 37 The HK USP is probably the most thoroughly tested pistol ever produced. The
testing process of the USP, already extreme in exceeding strict NATO AC-225
Military Specification Standards, in many ways mirrors the regimen the HK
SOCOM pistol was subjected to .
The barrel of the USP is cold-hammer forged from high-grade chromium steel,
the same type of steel used in cannon barrels. During testing, a bullet was
deliberately lodged in a USP barrel. Another cartridge was then fired into
the obstructing... 阅读全帖 |
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