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Firearms of note and ridicule


rmgill
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16 hours ago, DougRichards said:

More information: it looks like the stock has been significantly shortened.  That the police officer managed it so well in that condition is a credit to him.  But he was shooting at short range.

https://www.abc.net.au/news/2021-06-09/afp-operation-spoiled-machine-gun-norwood-cafe-murder-plot/100200142

It's not shortened, just missing. It's an easily detached item and it's probably been lost over the years, or maybe the cops just didn't bother to install it.

4101434.JPG

As to concealability it might not be too hopeless, if you didn't want it ready to go and the drop of a hat, if you were to pull the stock off, remove the mag, and pull the barrel, the parts would all fit into quite a small volume?

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56 minutes ago, Coldsteel said:

It's not shortened, just missing. It's an easily detached item and it's probably been lost over the years, or maybe the cops just didn't bother to install it.

4101434.JPG

As to concealability it might not be too hopeless, if you didn't want it ready to go and the drop of a hat, if you were to pull the stock off, remove the mag, and pull the barrel, the parts would all fit into quite a small volume?

The cops probably had to fire it in the condition that it was found, to prove that it could be fired, or some smart arsed criminal barrister would claim in court that it couldn't be fired without the stock and therefore was not a bad a weapon for a criminal to have.  Yes, barristers will try to make that sort of argument.

The cops probably didn't fire it with the ammunition found in the mag though, as they would have no way of knowing the condition of that ammunition or of its loadings.  They probably set up some kind of bench device, and fired a few rounds remotely, whilst that being videoed, so that again some barrister could not claim that the ammunition was fake.

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  • 4 weeks later...

"Wondering" gas system starts undergassed and then goes to overgassed. Not unique to this one, but not a good thing in general. Early M16s suffered from this (it also led to significant RoF increase which meant faster moving bolt than it was supposed to, which lead to part damage).

IOW, either this particular rifle is faulty or Poland can not into ARs.

Edited by bojan
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The gas system is not fully resetting between shots. So you get ever higher pressure and earlier unlocking. The gun is probably overgassed and the operating system poorly balanced.

A project I worked on had such good vent and reset that the piston head stayed shiny after 6 magazines. Cyclic was around 600 rpm. 

It can be done, you just have to understand what you are doing. 

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29 minutes ago, sunday said:

What kind of polymer are they using in those cases?

Probably uber-proprietary.  This is, of course, not the first time polymer has been used for cartridge cases.  I remember seeing a .223 round several years ago. We know how those turned out.

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Some of the compounds showed here seems to have up to half the tensile strength of cartridge-grade brass. Not a bad starting point.

Seems a stuff called PEI is among the most capable, especially after reinforcing with several kinds of fillers, like glass or carbon fiber.

But it has been ages since I studied plastics material science.

Reading a bit more, there are two more substances that look like good candidates, PPS and PPA.

The later looks the most promising (source )
 

Quote

PPA’s are often a cost effective alternative to the more expensive fully aromatic aramids. Common applications include automotive, aerospace, electrical, and industrial parts that must withstand prolonged exposure to harsh chemicals and/or high temperatures. This includes motor parts, fuel line connectors, coolant pumps, bushings, bearing pads in aircraft engines, charge air cooler, fuel cutoff and water heater manifold valves, socket and plug-in connectors, high voltage bushings, motor housings, and head light components.

 

Also this:

Quote

Another important class of polyamides are semi-aromatic polyamides, also knowns as polyphthalamides (PPA).1 They are melt-processible, semi-crystalline thermoplastic resins made from the condensation of an aliphatic diamine such as hexametylene diamine with terephthalic acid and/or isophthalic acid. The aromatic portion typically comprises at least 55 molar percent of the repeat units in the polymer chain. The combination of aromatic and aliphatic groups greatly reduces moisture absorption which results in little dimensional changes and much more stable properties. Thus, PPAs fill the performance gap between aliphatic nylons such as PA6,6 and PA6, and the much more expensive polyaramids. They are mostly crystalline and offer high strength and stiffness at elevated temperatures. However, these resins are more expensive than aliphatic amides and are more difficult to process due to their higher melting point. To improve processability and to lower cost, they are sometimes blended with aliphatic polyamides such as Nylon 66.

Fully aromatic aramids are Kevlar and the like.

Looking a bit for pictures of the substance, the color of some of the pellets available is very similar to the white of the cartridge cases shown in the video. That could be misleading, however.

Edited by sunday
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1 hour ago, shep854 said:

Lots of potential; a game-changer?  I'm looking forward to see what the word is after a couple of deployments:

 

Some one in the comments mentioned putting a bayonet on it!

I wonder if a bayonet was part of the requirement? 

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2 hours ago, sunday said:

It is a SAW replacement. US Army is not going the WWII-era, IJA path of putting bayonets on LMGs!

Of course joking about the pig sticker. 

The weapon shown in the video. Is it intended as a M4 carbine or M249 light machine gun replacement?

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17 minutes ago, 17thfabn said:

Of course joking about the pig sticker. 

The weapon shown in the video. Is it intended as a M4 carbine or M249 light machine gun replacement?

I think they say SAW, i.e. M249, in the video. Depending on the ballistics of the round, perhaps even the M240.

Edited by sunday
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And then there was this:

Lego demands US company Culper Precision stop producing Glock pistol covering that looks like a toy

Posted 2h ago2 hours ago
A blue, yellow, red and green covering for a pistol.
The Block19 has been pulled from sale after a legal complaint by Danish toy company Lego.(

Culper Precision

)



https://www.abc.net.au/news/2021-07-14/lego-demands-stop-to-us-company-toy-gun/100291810

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If you want to make money off Lego's IP, then you need to have Lego's approval which usually means paying them if they're willing to share.

IP notwithstanding, this isn't a good idea, amusing though a Lego Glock is.  There are already tragic incidents enough where toy guns and real guns are confused for each other and no reason to encourage such mistakes.

 

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7 hours ago, sunday said:

I think they say SAW, i.e. M249, in the video. Depending on the ballistics of the round, perhaps even the M240.

Wishful thinking. It is BAR's retarded cousin. US is once again in "magical elven US archers soldier that hit opponents with magical arrows single shots @ 500 meters yards in combat". IOW, inability to make a competitive LMG with decently low mass (7-7.5kg for 7.62, 5kg for 5.56) and unwillingness to admit USSR got it right with LMG + DMR combo has lead to this abomination.

Edited by bojan
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Why muzzle breaks and compensators are important things:

M16A1:

gtp5lyt.png

 

M16A1 with AK-74 muzzle break:

xvIthcb.png

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11 hours ago, DougRichards said:

And then there was this:

Lego demands US company Culper Precision stop producing Glock pistol covering that looks like a toy

Didn't realize this was a covering for an actual gun as opposed to a Glock-alike made out of blocks. 

 

Edited by Markus Becker
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5 hours ago, shep854 said:

The video was about an individual carbine.  There were other mentions in the video about a separate LMG/SAW project.

Yes, you are right, and I stand corrected. The NGSW program aim is to replace both the M4 carbine (NGSW-R) and the M249 SAW (NGSW-AR). As the gun on the video has no bipod, that is the NGSW-R, so the M4 replacement.

https://sofrep.com/news/goodbye-m16-m4-and-helloooo-ngsw-r/

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21 hours ago, shep854 said:

Lots of potential; a game-changer?  I'm looking forward to see what the word is after a couple of deployments:

 

Brass cartridges help remove heat from the chamber when extracted by being well hot.  Wouldn’t this be an issue with the plastic ones?

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Idea with plastic ones is that they do not transfer as much heat to the chamber. OTOH, most heat is generated in the barrel due the bullet friction, so...

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