I recently did a video on the M855 vs the M855A1. The comments section had a lot of comments about me using a 18” Mk12 in the video vs. a 14.5” barrel. Some claimed this is why the velocities were lower. So, here’s proof the 18” barrel didn’t slow the velocity.
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I think this comes from the fact that the A1 ammo runs ‘tighter’ down the barrel. I think it’s possible that a M193 ball would exit faster than 855a1 out of a 20”.
20" my favorite barrel then 18 and 16
I wonder what actual length of barrel would cause diminishing returns for the 5.56 cartridge.
I think this just means they both move fast and i wanna be under cover if shits popping off mmmkay mmmkay
Its 150 fps faster (3250 fps)n a 24" Klein Machining barrel, too.
Who knew longer barrels are faster?
6 inches = 190 FPS? … Damn. Looks like 14.5 pinned and welded is the way.
Paul Harrell has some great vids on this stuff RIP Charlie’s dad😂 Paul you like that right??
Nobody said anything like that. Everyone knows a longer barrel will have more velocity. Are you just making stupid videos now to answer questions that were never asked?
I'm showing my age but the A2 was what I carried when I was in.
Mac, did you have the m16A2 when you were in the Marine Corp?
I had heard the A1 powder burned faster than regular 855 ammo, and would far better in comparison out of a shorter barrel. But if you argued the longer barrel would slow it down, somebody should take away your internet connection.
Makes no difference
when you get this bullet in your meat i don't believe you feel the difference haha but good to know common sense is still alive
Man, I’m not even a gunsmith and I knew how that was gonna turn out😂
Lol at 30 seconds that is the most perfect "you morons" look Ive ever seen
Thats 38% more barrel.
Basic physics dictates velocity versus barrel length versus muzzle energy versus trajectory versus and keep adding more variables.
This ain’t Cod kids hahaha
Goes without saying. Only the Kiwis think you get more ooomph out of a shorter barrel …
There are really people who think you'll get better velocity out of a 14.5" barrel than a 20" barrel? That's sad……
Let me give a quick run down of how these things actually work, for people who don't know. First, most people think that when you fire a gun the firing pin hits the primer, the primer goes off igniting the gun powder, the gun powder burns and builds up pressure that then forces the projectile out of the cartridge and into the barrel, the projectile them flies down the barrel and exits. This IS NOT how it actually works. When the primer goes off, it generates enough energy by itself to push the projectile out of the case and into the barrel, and then as the powder burns it will accelerate the projectile down the barrel as it builds up more and more pressure. That's why there are powders that burn at such wildly different speeds. The goal is to have the powder finish burning just as the projectile gets right to the very end of the barrel. M855 is a rifle cartridge, it's made to be shot out of rifle length barrels. Therefore, when you shoot it out of shorter barrels you will lose velocity because the projectile doesn't have as much barrel to build acceleration through, and you will also tend to get a bigger fireball coming out of the barrel too. That is because of unburnt powder that ignites on contact with the open air, of course.
Yep… you really gotta watch out for barrel drag. 😂