My office was formerly a crime lab and I found this in the parking lot. It caribe my eye because I thought it was a bullet or a casing. It says "9MM" on the side and it has a blown primer on the bottom. The top is hollow, and the entire thing is made of aluminum.
*caught my eye, holy shit I'm moronic
I think it's a spent simunition round, could be wrong
Holy shit mane you right. Its a UTM sim round
well that's not a normal 9mm brass casing and the bottom looks like its made of two separate pieces which makes me think it's not a cartridge. it doesn't look tapered, which is strange and means it's probably not a bullet. it also looks much much thicker than any cartridge would be, it doesn't look like a casing to me at all but that sure as shit looks like a primer
doubt it
nailgun blanks and such are usually rimfire and wouldn't have such an overbuilt cartridge, that's whats curious about this. it's very thick metal
>doubt it
Well, you're wrong. See
i used to machine thousands and thousands of those a month (the plastic piece, believe it or not, has a very tight tolerance so needs to be machined).
just realized what the fricking things were just now because of this thread.
looks like plastic injection though, you'd suspect the crimped case mouth would take care of the tolerances
how ? i can see where it was hand de-burred from here easily and no PI mark. we did shit for the space station, military aircraft, all sorts of shit where i worked. some of the prints were even marked not to make copies and so on.
pretty sure we made them in a bunch of calibers too. all out of white delrin solid tube stock on the cnc lathes
dunno I've got both a couple spent 9mm and 556 simunition securiblank cases and they've got a very clear injection mould line, and you can feel it with your nail. The front tip of those cases where the nozzle is in the blue plastic tip has features you can't machine on a lathe or mill readily either (cross pattern structure)
look at the one farthest to the right, you can see the id isn't perfect at all. it's tooling marks. only the one OD had to be within 1 thou (where it seats into the brass)
lol i love when midwits post an entire novel of fanfic only to get immediately BTFO. Except this guy spent too much time up his own ass and was BTFO before he even posted
NTA but the thing is that people often overlook that these cases have a piston-type mechanism where the gasses actually expand the case itself. Some gas is used to launch the simulation projectile (or not, and vented) but all the cycling is done by the piston mechanism of the case
Better. The piston system both causes the system to cycle through blowback, but it also pushes a steel BB into a primer which then is used to propel the marker projectile.
cool, nice picrel. I mean it looks more like the BB is propelled by the powerload rather than the piston/slide but yeah
Thread has been answered but discourse (or discourse about the discourse to be exact then) about the munition is interesting and on-topic and board related
>being this much a little grouchy malding Goofy McGoo
you sad, sad man
>two projectiles
>two fricking primers (one of which is set off by a projectile!)
>possibly another case inside
WHY THE FRICK?
When you need to cycle the slide/bolt with the same powder load as the projectile, you are forced to use high muzzle velocities which hinder safety.
Using a powder charge to cycle the weapon and only a primer to drive the projectile allows you to increase the blowback force without changing projectile velocity.
>here's a self reply wall of chanslop no one asked for to really show off how smart I am
Holy shit, shut the frick up. If you couldn't figure out how that shit works from looking at the spent case you aren't worth conversing with.
laser training round?