slo-mo gun pr0n

Wow. Some guy has been at work with a high-speed camera and a couple of M1A’s. He was looking to settle a dispute as to whether the action starts cycling before or after the bullet has exited the barrel:

Cool things to look for: 1) The barrel oscillations in the first vid after the bullet has left the barrel. Look at that thing wobble! 2) The rotating bolt doing its thing in all 3 videos (easiest to see in 3rd video, then watch the other two again). 3) Slow-mo brass flying through the air is awesome 😀 It reminds me of a satellite being launched from the space shuttle.

I’m actually kind of surprised by the results. It really does appear that the action stays motionless until after the bullet has passed the muzzle. Definitely seems counter-intuitive to me. How is there enough pressure in the barrel after the bullet is gone, etc. I guess it’s mostly just due to inertia. The forces have started to act on the op-rod before the bullet leaves the barrel, but the op-rod just hasn’t really started to move yet. Any physicists want to clue me in? 😀

edit: The same guy has some other videos too. He compares two S&W .38 Special revolvers, one an Airlight and one a normal weight. Check out the guy’s hand deforming under recoil with the Airlight! And on the normal weight one, you can safely skip all but the last 30 seconds of the video, unless you’re really interested in watching the hammer pull back one pixel at a time..

Advertisements
Explore posts in the same categories: Uncategorized

10 Comments on “slo-mo gun pr0n”


  1. […] Go pay a visit over to The Gun Blobber. […]


  2. Yep, it’s all about the momentum. In truth the bolt is moving as the bullet is still in the barrel, but the movement is so tiny because of the force of the spring and the mass of the bolt versus the mass of the bullet. The energy has already been imparted to the bolt, it just needs a split second more to get going.


  3. […] Gun Blobber, a new gun blogger, has posted videos of an M1A firing in slow motion Wow. Some guy has been at work with a high-speed camera and a couple of M1A’s. He was looking to settle a dispute as to whether the action starts cycling before or after the bullet has exited the barrel: […]


  4. Great to see another gun blogger. Great post.


  5. […] Guns in slow motion. […]

  6. Ritchie Says:

    Keep in mind that gas does not even get into the gas cylinder until the base of the
    bullet goes past the gas port. At this point, the barrel pressure is roughly
    5,000 psi +or- 2,000 , so things move right along then. The bullet is moving about
    33 microseconds per inch, so just to pick a reasonable number, me not having an M1 to measure and all, let’s say the gas port is 6″ from the muzzle, so the gas pressure is contained for just about 200 microseconds before the cork (bullet) flies out the end.

  7. Seth from Massachusetts Says:

    Actually there’s another little thingy involved. Pick up an M1 or M1A sometime and pull the charging handle back very slowly, and you’ll note the “Op rod” moves a little bit, perhaps a quarter of an inch, before the cam in it contacts the thingy which projects from the side of the bolt and forces the bolt to twist out of it’s locking recesses. That gives the bullet time to get out of the barrel and the pressure to begin to drop before the bolt unlocks.

  8. Dave from Canada Says:

    You better hope that action doesn’t open before the bullet leaves the barrel – the result would be a potentially lethal blast of hot expanding gas in your face! Madrocketscientist is wrong: the M1A bolt is designed to lock until chamber pressure has subsided to the point where it is safe to cycle the action – ie. after the bullet has exited the barrel.


  9. […] Slo-Mo Gun Porn […]


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s