Not sure which one this is, but fun fact there's two versions of the famas rifle grenade
The older F1 which needed to be used with blank rounds
And the newer F2 grenades which have a bullet trap allowing the use of live rounds to fire the grenade.
Most rifle grenades need a blank round, or it will fucking explode and kill you. There's a pretty nasty WW2 picture you can find online of an M1 garand that exploded because a live round was fired into the grenade and killed the shooter.
The US tried to adapt a French shoot through rifle grenade when they showed up on the battlefield in WW1. But they were different caliber rifles so they had to slightly redesign it.
I can't remember exactly why, but the US rounds were more likely to splinter while firing it, and could potentially make it go bang right in your face.
Any rifle with a 22mm flash hider can launch those grenades. I used to get the M1A2 hand grenade adapters and launch them off an AR or Yugo SKS with tennis balls in them.
The M31 was neat, but didn’t go very far with standard blanks. You can still find those around.
Older type rifle grenades just use the gas pressure generated by a blank. Newer types use a bullet trap.
You'd have to define 40mm, as they're made in low velocity, medium velocity, and high velocity variants. The classic Vietnam-era M79 break barrel grenade launcher and the AR15 platform M203 use 40Ă—46 mm LV. The Mk 19 automatic grenade launcher uses 40Ă—53 mm HV.
No, the main reduction in recoil is because of the high-low system, invented by Nazi Germany initially as way to reduce propellant. Although only deployed 81mm PAW 600 anti-tank gun.
You don't seem to be understanding the concept. A rifle grenade launches at full force, all that mass is immediately moved forward. A 40x46mm LV grenade uses around twice the amount of propellant as 7.62mm NATO and is around 3/4 of the overall mass. In the high-low system the explosion of the propellant charge is contained in the small pressure vessel until the seal is breached and then vented at a much lower pressure behind the projectile. It was gives the M79 the distinctive "thump" sound, and likewise the much lower recoil.
I understand the system properly. This is basic physics we're talking about. The weight of the projectile is the main factor, as outlined in the overview of such systems. The projectile in a 40mm grenade is significantly lighter than any rifle grenade launched from the barrel. I accept that spreading out the recoil impulse over time reduces felt recoil but it does not reduce overall recoil.
Again, the weight of the projectile is the primary factor here, even though I got downvoted to shit, it's just basic physics.
This grenade is the same diameter but weighs almost three times as much
(Could've sworn the rifle grenade was wider bc that's half the point of using rifle grenades vs launcher, allows for bigger diameter and therefore better anti armor capability)
With this model, and other "bullet trap" designs, yes. With older rifle grenades you would unload the chambered round and load a blank
Rifle grenades also have much more mass than the projectile from a 40mm. Remember, there's no casing left behind or anything, you're flinging the whole grenade with the metal housing, fins, and bullet trap all included.
Newton's Second Law states the sum of all momentum in a system is 0 for inelastic collisions. Explosions are inelastic.
For a bullet from a FAMAS, 55 grains at 3300 FPS = 56000 grains (or 8 pounds, which is what the FAMAS weighs) at 3 FPS, so the recoil from 5.56 is equivalent to an 8 pound weight hitting you at 3 FPS.
For a rifle grenade from a FAMAS, 7875 grains at 155 FPS (assumption from maximum range) = 56000 grains (again) at 22 FPS, so the recoil is the same 8 pound weight hitting you at 22 FPS.
That is equivalent to firing .500 Nitro Express (570 grains at 2150 FPS), and yields 7.3x the recoil of 5.56.
The instructor’s manual for the Swiss army’s rifle grenades in the 70s (1.5kg of rocket booster pain) actually includes a section on how to spot nervous shooters, from details like repeatedly remounting the rifle in position, quivering on the back of the helmet, moving too slowly when loading, etc. It was a serious issue because panicking and nervous troops wouldn’t set their position up properly to brace themselves, and thus would inadvertently increase their risk of injury.
Heard from a former french military youtuber that you'd recognize soldiers who had their first shot at it because they'd have two small wounds on the top of their foreheads from the carry handle corners colliding with their skull
SebWeg@reddit
Cool wasn’t aware you can mount a Famas to this GL. Nice little detail.
Rimland_Hegemon@reddit
France is definitely the Russia of Western Europe.
Useless_Fox@reddit
Not sure which one this is, but fun fact there's two versions of the famas rifle grenade
The older F1 which needed to be used with blank rounds
And the newer F2 grenades which have a bullet trap allowing the use of live rounds to fire the grenade.
Most rifle grenades need a blank round, or it will fucking explode and kill you. There's a pretty nasty WW2 picture you can find online of an M1 garand that exploded because a live round was fired into the grenade and killed the shooter.
KurtFrederick@reddit
I Found a incident similar with what you said, only that 3 guys died from that mistake
IlluminatedPickle@reddit
The US tried to adapt a French shoot through rifle grenade when they showed up on the battlefield in WW1. But they were different caliber rifles so they had to slightly redesign it.
I can't remember exactly why, but the US rounds were more likely to splinter while firing it, and could potentially make it go bang right in your face.
IcyRobinson@reddit
Gotta give them props for design tho since the nade can be fired with a live round đź‘Ť
dr_xenon@reddit
Any rifle with a 22mm flash hider can launch those grenades. I used to get the M1A2 hand grenade adapters and launch them off an AR or Yugo SKS with tennis balls in them.
The M31 was neat, but didn’t go very far with standard blanks. You can still find those around.
thepvbrother@reddit
MAS 49/56?
dr_xenon@reddit
Yes. I have that in .308. Way more powerful than the AR.
Taolan13@reddit
tennis balls in a grenade adapter fired with blanks...
my dude you have just elevated my fetch game with the dogs to a whole new level.
FuddFucker5000@reddit
Does all barrel loaded grenades kick like this???
MercilessParadox@reddit
Basically yea, newton's laws brother
FuddFucker5000@reddit
A 40mm does not kick that hard?
Does the bullet stay lodged into the grenade?
Plump_Apparatus@reddit
Older type rifle grenades just use the gas pressure generated by a blank. Newer types use a bullet trap.
You'd have to define 40mm, as they're made in low velocity, medium velocity, and high velocity variants. The classic Vietnam-era M79 break barrel grenade launcher and the AR15 platform M203 use 40Ă—46 mm LV. The Mk 19 automatic grenade launcher uses 40Ă—53 mm HV.
Regardless they all have "less" kick as just about every grenade launcher uses the "high-low" system. The propellant is in a separate pressure vessel with ports leading to the base of the shell. This significantly reduces recoil.
Pavotine@reddit
The main reduction in recoil must be weight of projectile. Those 40mm rounds have to be much lighter than the rifle grenade like we just saw.
Plump_Apparatus@reddit
No, the main reduction in recoil is because of the high-low system, invented by Nazi Germany initially as way to reduce propellant. Although only deployed 81mm PAW 600 anti-tank gun.
You don't seem to be understanding the concept. A rifle grenade launches at full force, all that mass is immediately moved forward. A 40x46mm LV grenade uses around twice the amount of propellant as 7.62mm NATO and is around 3/4 of the overall mass. In the high-low system the explosion of the propellant charge is contained in the small pressure vessel until the seal is breached and then vented at a much lower pressure behind the projectile. It was gives the M79 the distinctive "thump" sound, and likewise the much lower recoil.
Pavotine@reddit
I understand the system properly. This is basic physics we're talking about. The weight of the projectile is the main factor, as outlined in the overview of such systems. The projectile in a 40mm grenade is significantly lighter than any rifle grenade launched from the barrel. I accept that spreading out the recoil impulse over time reduces felt recoil but it does not reduce overall recoil.
Again, the weight of the projectile is the primary factor here, even though I got downvoted to shit, it's just basic physics.
IlluminatedPickle@reddit
I dunno where this "bullet traps are new tech" shit comes from. They've been around about as long as rifle grenades have existed.
d0d0b1rd@reddit
This grenade is the same diameter but weighs almost three times as much
(Could've sworn the rifle grenade was wider bc that's half the point of using rifle grenades vs launcher, allows for bigger diameter and therefore better anti armor capability)
MusicallyInhibited@reddit
With this model, and other "bullet trap" designs, yes. With older rifle grenades you would unload the chambered round and load a blank
Rifle grenades also have much more mass than the projectile from a 40mm. Remember, there's no casing left behind or anything, you're flinging the whole grenade with the metal housing, fins, and bullet trap all included.
Q-Ball7@reddit
Newton's Second Law states the sum of all momentum in a system is 0 for inelastic collisions. Explosions are inelastic.
For a bullet from a FAMAS, 55 grains at 3300 FPS = 56000 grains (or 8 pounds, which is what the FAMAS weighs) at 3 FPS, so the recoil from 5.56 is equivalent to an 8 pound weight hitting you at 3 FPS.
For a rifle grenade from a FAMAS, 7875 grains at 155 FPS (assumption from maximum range) = 56000 grains (again) at 22 FPS, so the recoil is the same 8 pound weight hitting you at 22 FPS.
That is equivalent to firing .500 Nitro Express (570 grains at 2150 FPS), and yields 7.3x the recoil of 5.56.
Domovie1@reddit
Pretty much- it’s just a physics question.
There’s a reason that a lot of rifles are specially reinforced for launching grenades, or which are meant to be braced against the ground.
It’s also why they may have gas cut-offs, so that the added pressure doesn’t damage the mechanism on a semi-auto.
ACarKey@reddit
You can tell how he is not looking forward to that recoil and mentally preparing himself for it. “Alright here we go. Just get it over with.”
walt-and-co@reddit
The instructor’s manual for the Swiss army’s rifle grenades in the 70s (1.5kg of rocket booster pain) actually includes a section on how to spot nervous shooters, from details like repeatedly remounting the rifle in position, quivering on the back of the helmet, moving too slowly when loading, etc. It was a serious issue because panicking and nervous troops wouldn’t set their position up properly to brace themselves, and thus would inadvertently increase their risk of injury.
tantricbean@reddit
I was watching being like: Damn. That must kick. He does not wanna shoot it.
slippery_salope@reddit
Heard from a former french military youtuber that you'd recognize soldiers who had their first shot at it because they'd have two small wounds on the top of their foreheads from the carry handle corners colliding with their skull
donnie_rulez@reddit
I have heard these are not so fun to shoot.
So has the shooter apparently lmao
That_Somewhere_4593@reddit
Manical laughter at launching something that blows up: the universal language!
_yetifeet@reddit
There was a version of this for the SA80.
Some would place the butt of the rifle on the ground and fire it like a mortar.
GruesomeWedgie2@reddit
With practice his rate of fire will increase.
Marioninleather@reddit
That's what training is for. It looks like he forgot some preparatory steps.
willem_79@reddit
Great, now do all that while someone is firing at you
LordSimonicus@reddit
You would load the grenade in cover and only expose yourself when you're ready to shoot.
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