Sour rounds... very puckered
But yes I'd say blanks of some sort. 50bmg blanks
But yes I'd say blanks of some sort. 50bmg blanks
What do I have here?
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Artie,
My thought they are Lake City Arsenal Grenade Launcher Cartridges due to the tight crimp on them. Most all Blank Cartridges do not have that type of real tight crimp. I am not sure of the caliber or the weapon. But the weapon would in all likelihood since the Cartridges seem to be is some type of a clip Fastner, so they all can be loaded at the same time. IMO into the weapon's 10 cylinders.
They could be Blanks for the same weapon it might require the tight crimp to increase pressure to make the weapon operate properly with Blanks? I will keep doing some research since my curiosity is peaked as well. But they are one of the above items mentioned.
03
My thought they are Lake City Arsenal Grenade Launcher Cartridges due to the tight crimp on them. Most all Blank Cartridges do not have that type of real tight crimp. I am not sure of the caliber or the weapon. But the weapon would in all likelihood since the Cartridges seem to be is some type of a clip Fastner, so they all can be loaded at the same time. IMO into the weapon's 10 cylinders.
They could be Blanks for the same weapon it might require the tight crimp to increase pressure to make the weapon operate properly with Blanks? I will keep doing some research since my curiosity is peaked as well. But they are one of the above items mentioned.
03
Wow, never seen those before. My first thought because the way they are stamped was "Long Colt Thirty Eight" ammo. They do make such ammo but I would need to know the exact measurements to make sure. See this link: https://en.wikipedia.org/wiki/.38_Long_Colt
50 BMG Short blanks linked for the Ma Deuce (M2 machine gun). They should be right at about 4 inches in length.
I couldn't tell if they were linked or not. They appear to be but I wasn't sure.
As y'all have said- .50 BMG blank rounds- from Lake City Ammo Plant, 1983. Before the rainy season.
The 7.62mm blank has changed. The old blank used in the M60 machinegun was loaded with EC blank powder and closed with a paper wad. Now, EC blank powder is totally different stuff: It was used is some US frag grenades.
After Desert Storm i received a call from a company with a contract to train Saudis. FN MAG machine guns were blowing up. EC blank powder accumulated in the gas tube, lit off and burst the tube. The US Army designated the FN MAG the M240 and it replaced the M60, which i think was the wrong way to go.
Put the trainers onto a supply of crimped FN blanks and no more problems: The newer US 7.62mm blank:
7.62x51mm Blank M82 – CBC Defense
After Desert Storm i received a call from a company with a contract to train Saudis. FN MAG machine guns were blowing up. EC blank powder accumulated in the gas tube, lit off and burst the tube. The US Army designated the FN MAG the M240 and it replaced the M60, which i think was the wrong way to go.
Put the trainers onto a supply of crimped FN blanks and no more problems: The newer US 7.62mm blank:
7.62x51mm Blank M82 – CBC Defense
Thanks for clearing this up everyone.
I remember putting on BFD (blank firing device?) on the m16a2 with a cigarette butt to increase the pressure so it would cycle correctly. Burst never seemed to work though
The only other time we were allowed to use burst was during live fire in Twentynine palms when it was at the end of a convoy run and they wanted us to spend the rest of the ammo. It worked then
I wonder do most semi or full autos with gas operation have some kind of issue or need an extra device for blanks to cycle?
The only other time we were allowed to use burst was during live fire in Twentynine palms when it was at the end of a convoy run and they wanted us to spend the rest of the ammo. It worked then
I wonder do most semi or full autos with gas operation have some kind of issue or need an extra device for blanks to cycle?
Yes, blanks won't operate the BCG, not enough back pressure, hence the device on the muzzle. Live rounds work because more powder and the bullet dwell time once it passes the gas port in the barrel. This is why you have to select the correct gas length when building your AR depending on its intended use and barrel length. There are currently four gas lengths: rifle, mid length, carbine and pistol length gas.
Rifle is intended for barrel lengths of 18"+, the port is typically somewhere between 13" and 15" from the chamber depending on brand.
Mid length is for barrels 16" to 18" with the port around 11.5" to 12" from chamber.
Carbine length is for barrels 14" and 16" with the port at about 9.75" to 10" from chamber.
Pistol length is for barrels 10" or shorter with the port between 4" and 7" from chamber depending on the barrel.
The dwell time is the barrel length remaining after the gas port, thus the time the bullet is still in the barrel once it passes the gas port. The longer that is, the more pressure it makes in the gas tube to reliably operate the action.
Pistols can sometimes be problematic, especially for super short barrels (less than 8"). If the systemn isn't getting enough gas, sometimes making the port larger can fix it, or if you reload, using powder that is "more gassy."
One downside of pistol length gas is erosion of the port as it is so close to the chamber, it get hits with a lot of heat and blast.
One other issue with builders is they try to make a stubby pistol that shoots both supersonic and subsonic rounds reliably. It can be done, but such a set up isn't really optimal. If you have enough gas to reliably operate subsonics, it is typically over gassed with supers, which pounds the heck out of the internals. Set it up for supers and it might not reliably cycle subs because it won't get enough gas pressure. The AR gas system is relatively simple and asking it to shoot both types of rounds reliably is asking a lot. I personally prefer to build pistols to specific set ups, for example my 7.5" 300 Blackout is a dedicated suppressed subsonic shooter. Yes, it will shoot supers and cycle, but is way over gassed for that, so I shoot those rarely, if ever.
There are lots of accessories for the AR platform to try to bridge this gap, such as adjustable gas blocks, or adjustable bolt carriers, or different diameter gas tubes. That's fine, and they do work, but they're expensive and add another potential point of failure. For example, adjustable gas blocks erode due to the heat and blast, just like the gas port in the barrel, and eventually the setting is altered as erosion increases. Some, after enough rounds, lock up and can't be adjusted anymore (most use some sort of set screw to change the port size in the block). All of this stuff is, IMHO, fine for a range toy, but if you are building something you want to trust your life to, you want as few failure points as possible and reliable function. My 300 Blk pistol is slightly over gassed using the subs I run in it, but that means I don't have to worry about it short stroking and suffering any other "low gas" issues. It probably has some effect on it's internal parts lifespan, but as is, will be viable probably longer than I'm going to be alive, unless I start pounding out several thousand rounds a week and wear it out. It has no adjustable gas blocks or any other fancy after market doo-dads that aren't necessary.
Rifle is intended for barrel lengths of 18"+, the port is typically somewhere between 13" and 15" from the chamber depending on brand.
Mid length is for barrels 16" to 18" with the port around 11.5" to 12" from chamber.
Carbine length is for barrels 14" and 16" with the port at about 9.75" to 10" from chamber.
Pistol length is for barrels 10" or shorter with the port between 4" and 7" from chamber depending on the barrel.
The dwell time is the barrel length remaining after the gas port, thus the time the bullet is still in the barrel once it passes the gas port. The longer that is, the more pressure it makes in the gas tube to reliably operate the action.
Pistols can sometimes be problematic, especially for super short barrels (less than 8"). If the systemn isn't getting enough gas, sometimes making the port larger can fix it, or if you reload, using powder that is "more gassy."
One downside of pistol length gas is erosion of the port as it is so close to the chamber, it get hits with a lot of heat and blast.
One other issue with builders is they try to make a stubby pistol that shoots both supersonic and subsonic rounds reliably. It can be done, but such a set up isn't really optimal. If you have enough gas to reliably operate subsonics, it is typically over gassed with supers, which pounds the heck out of the internals. Set it up for supers and it might not reliably cycle subs because it won't get enough gas pressure. The AR gas system is relatively simple and asking it to shoot both types of rounds reliably is asking a lot. I personally prefer to build pistols to specific set ups, for example my 7.5" 300 Blackout is a dedicated suppressed subsonic shooter. Yes, it will shoot supers and cycle, but is way over gassed for that, so I shoot those rarely, if ever.
There are lots of accessories for the AR platform to try to bridge this gap, such as adjustable gas blocks, or adjustable bolt carriers, or different diameter gas tubes. That's fine, and they do work, but they're expensive and add another potential point of failure. For example, adjustable gas blocks erode due to the heat and blast, just like the gas port in the barrel, and eventually the setting is altered as erosion increases. Some, after enough rounds, lock up and can't be adjusted anymore (most use some sort of set screw to change the port size in the block). All of this stuff is, IMHO, fine for a range toy, but if you are building something you want to trust your life to, you want as few failure points as possible and reliable function. My 300 Blk pistol is slightly over gassed using the subs I run in it, but that means I don't have to worry about it short stroking and suffering any other "low gas" issues. It probably has some effect on it's internal parts lifespan, but as is, will be viable probably longer than I'm going to be alive, unless I start pounding out several thousand rounds a week and wear it out. It has no adjustable gas blocks or any other fancy after market doo-dads that aren't necessary.
1 - 12 of 12 Posts
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