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Posted: 1/30/2006 12:18:16 PM EDT
[#1]
slightly heavier
shrouded firing pin |
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Posted: 1/30/2006 12:19:50 PM EDT
[#2]
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Posted: 1/30/2006 12:30:33 PM EDT
[#3]
the firing pin area is not exposed to keep the firing pin from hanging up on the hammer.
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Posted: 1/30/2006 12:39:13 PM EDT
[#4]
Extra weight helps delay unlocking of the bolt when a cartridge is fired. This allows time for the pressure to drop before extraction begins. Normally, this is not needed, but in short barreled guns it can help a bunch.
On many AR15s, the bolt carrier is cut away under the area where the hammer hits the firing pin, exposing the head of the firing pin to the hammer on the return stroke of the bolt carrier. The hammer, on said guns, has a 'hook' of sorts cut into the top of the hammer that catches the head of the firing pin, usually wonking your firing pin retaining pin. The purpose of this mod was to prevent slam fires caused by people modifying their guns to fire full auto. Since an AR won't fire if the hammer rides the bolt home anyway, it was pretty stupid. Only certain manufacturers insulted us with this modification. |
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Posted: 1/30/2006 12:47:43 PM EDT
[#5]
The weight issue is often sighted, although I'm half tempted to believe that it's internut myth.
I like the shrouded firing pin collar, although it is a little more difficult to clean. I run 16 carriers in most of my guns. |
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Posted: 1/30/2006 1:01:05 PM EDT
[#6]
Yep, my Colt LE6920 came like this...... Fuctions perfectly but the retaining cotter pin gets bent and is harder to reinstall. Bought a couple extra cotter pins incase I can't get bent ones back in. |
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Posted: 1/30/2006 1:04:33 PM EDT
[#7]
I use full auto carriers with heavy buffers to make the action more smooth in all my rifles. Unless you shoot a lot you really won't be able to tell the difference with either part installed.
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Posted: 1/30/2006 2:15:04 PM EDT
[#8]
shrouded firing pin.
less reciprocating mass will make for a faster second shot. not more. |
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Posted: 1/30/2006 2:30:04 PM EDT
[#9]
None that can be empirically documented.
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Posted: 1/30/2006 2:30:36 PM EDT
[#10]
Stupid comment
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Posted: 1/30/2006 2:33:11 PM EDT
[#11]
The shrouded firing pin advantage is no longer true since most current AR bolt carriers have the shrouded firing pin. As for the extra mass, the only difference you may notice is your rifle short cycling with low power (WOLF) ammo.
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Posted: 1/30/2006 2:38:51 PM EDT
[#12]
.
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Posted: 1/30/2006 2:42:10 PM EDT
[#13]
I think it's more a case of "why not". The carrier was designed a certain way for a reason, and cutting part of it off for no good reason just doesn't seem right.
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Posted: 1/30/2006 3:18:53 PM EDT
[#14]
I think the big deal with the larger mass of an M16-type carrier has at least as much to do with its speed AFTER the bolt unlocks as it does with slowing the unlocking process. It takes more energy (gas pressure over time) to move a larger mass, so it does make sense that unlocking time should be slowed down. But once that mass gets moving, it will move until something-the recoil spring-stops it. It will take longer for the recoil spring to absorb the kinetic energy of a heavier carrier, and longer for the spring to accelerate the carrier forward from a stop. This all adds up to materially slowing the cyclic rate-whether in auto or semiauto mode. A slower rate of fire equates to a less jarring, smoother operation.
With short gas system rifles (carbine length gas systems in particular) the gas from the gas port flows not only earlier in the cycle, but more forcefully, as it's tapped from closer to the chamber. Using a heavier carrier can help moderate the violence of such a rifle's functioning, and not only improve follow up sight picture acquisition, but really lessen wear and tear on the moving parts as well. Just my 2¢ worth... |
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Posted: 1/30/2006 3:20:21 PM EDT
[#15]
If you want a heavier carrier, David Tubb sells a weight system that fits in the back part of the carrier.
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Posted: 1/30/2006 4:33:57 PM EDT
[#16]
Mine too. Never had to keep spares on hand before, but I'm on my second one. I think I'll try the fully shrouded one in my next AR. |
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Posted: 1/30/2006 6:34:22 PM EDT
[#17]
That isnt a very smart bit of advice. Hammer, disconnector, and selector will get you in BIG trouble, and are not necesary in a semi auto gun. |
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Posted: 1/30/2006 6:55:36 PM EDT
[#18]
I woud think the heaver carrier was designed to be heavy, to SLOW DOWN the cycle rate of the M16 as to not waste ammo and to produce better hits in FA. In a semi-auto I think the lighter bolt carrier is better to allow quicker follow up shots as the cycle rate is determined by the trigger puller. In IPSC I would NOT want a heavy bolt because I want to accuratly elimate all bad paper targets as fast as I can and never fail. Kinda like REAL LIFE except subsitute person for paper.
Bill |
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Posted: 1/30/2006 7:06:13 PM EDT
[#19]
Speed up the bolt too much, even in semi-auto, and the bolt can travel faster than the magazine can feed the action, or eject spent casings, especially if your mag springs are getting a little worn.
lightening bolts, springs, slides, etc....almost always comes with a cost of reliability for increased performance when the gun is working. |
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Posted: 1/30/2006 10:51:51 PM EDT
[#20]
I like using an M16 carrier so I can throw my upper on my friends M16 lower and hose some clay birds at 25 yards.
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Posted: 1/31/2006 12:47:50 AM EDT
[#21]
+1 |
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Posted: 1/31/2006 4:31:17 PM EDT
[#22]
I do appologize. I live in Canada where it's strictly the DIAS or other device that will get you in trouble.
Neither is the m16 carrier but even less so I do understand. I'm hearing conflicting statements and am just for my own account trying to find out what's legal and what's not for you southerners. The law is pretty clear up here. |
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Posted: 1/31/2006 4:47:00 PM EDT
[#23]
+1 I like to use the proper parts in my weapon. |
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Posted: 1/31/2006 5:00:27 PM EDT
[#24]
Anybody know the differance in weight between the M16 bolt carrier and the newer shrouded bolt carriers?
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Posted: 1/31/2006 5:36:57 PM EDT
[#25]
The most important thing is it makes the conversion to fully automatic fire much easier.
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Posted: 1/31/2006 5:42:18 PM EDT
[#26]
Right after you file the firing pin down.  WIZZO |
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Posted: 1/31/2006 6:45:56 PM EDT
[#27]
In the US, we have law, case law, and BATF interpretation of the law. The BATF considers possession of a semi-auto AR-15 rifle and M-16 trigger group components (hammer, disconnector, selector, and trigger) to be possession of an unregistered Class 3 weapon. The M-16 parts do not have to be installed in the AR-15, just in the possession of an individual who also possesses an otherwise legal AR-15. If you do not have an AR-15, possession of the M-16 parts is legal, since they are not legally a firearm (no receiver). Kinda stupid, but it's the BATF's position that possession of both means the individual has a criminal intent to construct a Class 3 weapon. That's the BATF's interpretation of the law. If I'm not mistaken, the BATF has managed to get at least one federal judge to agree with them. That's case law. So we have BATF interpretation of the law, and case law, so the actual laws don't mean much of anything concerning this issue. The BATF has all they need (their interpretation, and case law to back it up) to get a conviction (jail time, loss of certain rights, ruin your life, etc). Make sense now? |
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Posted: 2/1/2006 1:30:51 PM EDT
[#28]
The 'lighter' semi auto bolt carrier is the result of modifications to the regular, (i.e. class 3), bolt carrier. The FCG for an M-16 uses the front lip of the rear section of the bolt carrier to trip the hammer during full auto fire. With this part of the carrier removed, as well as the ramping of the underside of the carrier, it is more difficult to convert the rifle to full auto without additional modification. The use of a class 3 carrier is not in and of itself illegal, and is used by HP shooters to increase the mass of the rifle.
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Posted: 2/1/2006 1:47:58 PM EDT
[#29]
With all else being equal, the safe thing to to to slow your action down would to be installing a heavier buffer and maybe also a tungsten weight in your AR15 carrier. |
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Posted: 2/1/2006 2:25:28 PM EDT
[#30]
Constructive intent, possession, whatever, no longer exists since 5/19/86, when the law was changed. Having the parts to go full-auto, is called having a machine gun per US Code: 26 U.S.C. Sec. 5845 (b) Machinegun – The term “machine gun” means any weapon which shoots, is designed to shoot, or can be readily restored to shoot, automatically more than one shot, without manual reloading, by a single function of the trigger. The term shall also include the frame or receiver of any such weapon, any part designed and intended solely and exclusively, or combination of parts designed and intended, for use in converting a weapon into a machinegun, and any combination of parts from which a machinegun can be assembled if such parts are in the possession or under the control of a person. |
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