k*******n
发帖数: 5546 | 1 LINK:
http://pistol-training.com/archives/6837
When someone says his pistol is reliable, what does that mean?
I’ve met people who defined “reliable” based on the amount of ammo they
carry every day. Someone who carries a Glock 19 with a spare mag wants 31
rounds straight without a stoppage and he’s happy. Of course, that’s a
mess from a statistical standpoint. The sample size is too small to draw
meaningful conclusions. It might sound smart, but do you really want a gun
that is up against its performance envelope shooting such a small number of
rounds under ideal range conditions? Probably not.
Others will tell you that they’ve never had a stoppage of any kind! But
again we have to ask whether that’s a perfect run of 100 rounds or 10,000
rounds. What did he consider a stoppage? How many times did something happen
that he blamed on limp wristing, bad ammo, or some other gremlin other than
the gun itself? Data matters.
When I think about reliability, I think about it in two ways:
-What it takes to “prove” a gun is reliable enough to carry.
-How reliable a gun is long term.
For me to be comfortable carrying a new gun, it needs to shoot at least 200
rounds of the same JHP defensive ammo that I’ll carry when CCW’ing without
a single stoppage. Ordinarily, I’ll put at least 500 rounds of practice
ammunition through the gun first… mostly so as not to waste the more
expensive JHP ammo on a gun that might be having a problem. If the gun
cannot make it through that 500rd of FMJ-style ammunition, I’ll examine it
and attempt to fix anything either by working on it myself or returning the
gun to the manufacturer. Then I’ll start the cycle over again, 500rd of FMJ
followed by 200rd of JHP, minimum.
I’ve made exceptions in the past to the 500rd “warm up” before shooting
the carry ammo, usually for backup guns like my S&W 442 j-frame or my Ruger
LCP pocket gun. They still get 200 rounds of JHP, though. Yes, it’s
expensive. But because I test the ammo during my normal shooting routine, it
’s really just the difference in price between practice ammo and the JHP.
Over the long run, I’d rather have confidence in my pistol’s reliability
than a few extra shekels in my pocket.
Of course, if you shoot any gun enough you’ll eventually have a stoppage of
some kind. While many shooters either ignore it or suffer from selective
amnesia afterwards, if you really want to understand how well your gun runs
you need to keep honest and objective records about any instance when the
gun fails to go through its entire cycle of operation properly.
My personal threshold for long-term reliability is 2,000 Mean Rounds Between
Stoppages. Now, I’ve had very few serious pistols turn in reliability that
poor. Even my endurance test Glock gen4 17 with its problem childhood and
broken springs has turned in almost 71,000 rounds of service to date with a
total of 18 stoppages (a MRBS of almost 4,000). The HK45 endurance test gun
had a MRBS of 16,667. The P30 went 7,608 MRBS before it started to choke due
to the cracked frame at a little past 91,000 rounds. The M&P9 scored an
incredible 20,778 MRBS with two recorded stoppages and one spring breakage
that prevented the gun from functioning normally.
Part of my ongoing reliability evaluation involves not just my practice
ammunition but my carry ammo, as well. At a minimum, when my gun stays
loaded from the car to the firing line I’ll make sure the first round I
fire is the one that’s already chambered. (This also helps break the habit
of repeatedly chambering the same round which can eventually lead to bullet
setback and a dangerous overpressure situation) Frequently, I’ll shoot my
cold drill (the F.A.S.T.) with carry ammo. And once in a while I’ll check
zero or do some other accuracy work with the JHPs, too, to make sure I know
where the bullets will be going if I need them.
Finally, I have one more personal rule when it comes to reliability: I won’
t carry a gun if it’s had a stoppage within the last 200 rounds. So if I’m
at the range and the gun fumbles, either I put at least 200 more rounds
through it without a problem or I carry my backup gun on the way home.
Because even if it’s a one in a million fluke, I want to be sure the gun
hasn’t developed a breakage or other systemic problem that could go
unnoticed.
Which raises the issue of back-up guns. I’m not talking about a small
second gun that you carry. I’m talking about having an identical copy of
your everyday primary gun that you can pull out of the range bag and shoot
if something goes wrong with your main pistol. Is having a second gun
expensive? Yes. But if I had to choose between having three different types
of guns for fun or having a matching set of carry guns, well, I can find
other ways to have fun. Another popular alternative is to have a dedicated
training gun and a separate, identical dedicated carry gun. That way no
matter how much you abuse your gun during practice you’ll always have a
clean, top condition pistol in your holster when you’re off the range.
Again, all of these numbers are bare minimums. My personal guns get shot a
lot and if something goes wrong, I tend to put a lot of rounds downrange
before trusting one again.
Train hard & stay safe! ToddG | b*****e
发帖数: 5133 | 2 "I won’t carry a gun if it’s had a stoppage within the last 200 rounds."
用在家防这句话也适用。 | u*1
发帖数: 907 | 3 牛，全是子弹堆出来的啊
of
【在 k*******n 的大作中提到】
: LINK:
: http://pistol-training.com/archives/6837
: When someone says his pistol is reliable, what does that mean?
: I’ve met people who defined “reliable” based on the amount of ammo they
: carry every day. Someone who carries a Glock 19 with a spare mag wants 31
: rounds straight without a stoppage and he’s happy. Of course, that’s a
: mess from a statistical standpoint. The sample size is too small to draw
: meaningful conclusions. It might sound smart, but do you really want a gun
: that is up against its performance envelope shooting such a small number of
: rounds under ideal range conditions? Probably not.
| a***a
发帖数: 8941 | 4 The M&P9 scored anincredible 20,778 MRBS with two recorded stoppages and one
spring breakagethat prevented the gun from functioning normally.
=======M&P9 NB ya ............ | P*****J
发帖数: 1745 | 5 20k x 3 = 60k。一把枪打六万发子弹，太牛了。美军选M9的时候，每个型号7把枪一共
才打三万五千发子弹。
one
【在 a***a 的大作中提到】
: The M&P9 scored anincredible 20,778 MRBS with two recorded stoppages and one
: spring breakagethat prevented the gun from functioning normally.
: =======M&P9 NB ya ............
| k*******n
发帖数: 5546 | 6
one
恩 那把M&P9 7个月的时间，打了62,333 发子弹(好多钱)，坏了一个扳机弹簧（我备了
1个给我的M&P45）， ambi slide stop变一边的了。
【在 a***a 的大作中提到】
: The M&P9 scored anincredible 20,778 MRBS with two recorded stoppages and one
: spring breakagethat prevented the gun from functioning normally.
: =======M&P9 NB ya ............
| P*****J
发帖数: 1745 | 7 平均一天三百发，难道是军警训练场的枪？
【在 k*******n 的大作中提到】
:
: one
: 恩 那把M&P9 7个月的时间，打了62,333 发子弹(好多钱)，坏了一个扳机弹簧（我备了
: 1个给我的M&P45）， ambi slide stop变一边的了。
| b*****e
发帖数: 5133 | 8 其实测试的M&P和HK45都极端NB。
仔细看看stoppage原因，M&P的两次是dead trigger，这是早一批sear spring较细不给
力造成的，握枪不牢更容易发生，现在的M&P sear spring直径大了一倍，这个问题可
以说解决了。
HK45的一次stoppage是底火太硬，第二次再击发就打响了，更像是子弹问题。那个
malfunction估计是他自己sear spring没装好。
所以这两条枪除了扳机弹簧各断了一次可以说几乎不卡。
P30也强大，前面十个stoppage是main spring超标太硬，换了以后直到打到9万多发差
不多挂了时连卡三次，也就是只有剩下的三次是实在的stoppage，平均两万七千发卡一
次，整枪寿命也比M&P长些。
现在测试的1911可是经常清理经常上油一万发不到卡过4回了。
one
【在 a***a 的大作中提到】
: The M&P9 scored anincredible 20,778 MRBS with two recorded stoppages and one
: spring breakagethat prevented the gun from functioning normally.
: =======M&P9 NB ya ............
| a***a
发帖数: 8941 | 9 seems he changed to some after market main spring?
What is the purpose?
差不多挂了时连卡三次，也就是只有剩下的三次是实在的stoppage，平均两万七千发卡
一次，整枪寿命也比M&P长些。
【在 b*****e 的大作中提到】
: 其实测试的M&P和HK45都极端NB。
: 仔细看看stoppage原因，M&P的两次是dead trigger，这是早一批sear spring较细不给
: 力造成的，握枪不牢更容易发生，现在的M&P sear spring直径大了一倍，这个问题可
: 以说解决了。
: HK45的一次stoppage是底火太硬，第二次再击发就打响了，更像是子弹问题。那个
: malfunction估计是他自己sear spring没装好。
: 所以这两条枪除了扳机弹簧各断了一次可以说几乎不卡。
: P30也强大，前面十个stoppage是main spring超标太硬，换了以后直到打到9万多发差
: 不多挂了时连卡三次，也就是只有剩下的三次是实在的stoppage，平均两万七千发卡一
: 次，整枪寿命也比M&P长些。
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