Why hasn't the idea of using guns with optionally vented barrels (to slow full power loads to subsonic) been more thoroughly pursued? I get that you can just use subsonic ammo, yet that just adds another aspect to tend to, as opposed to simply having the gun do it for you.Its much more compact too, and if needed, allows the users to attack armored targets &/or reduce wall penetration.
>>65117759because it's needlessly complicated for almost no benefit.
>>65117759Velocity is mainly determined by powder charge, mainly. To make a barrel that would affect velocity that much would make a terrible weapon.
I too remember those Tom Clancy books
>>65117759Both MP5 and VSS tried and was deemed to be not worth while to pursue any further.
Venting that much charge would be loud as shit boy kind of defeat the point of subsonics
>>65117765That is why they need caseless ammo with shave-able charge.
>>65117810just like how the MP5SD is loud as shit?
>>65117814Just carry a mag with subsonic rounds in this outlandish infantryman scenario. They're doing that with 7.62x39 Yugo AKs with the gas cutoff in Ukraine
>>65117794You mean the SMG II?
The use case for subsonic is usually for suppressed fire. Venting gasses to reduce velocity would require a suppressor for the venting holes.
>imagine trying to teach your infantry men, who are just barely fit to mop a floor, how to finely tune the adjustable venting system based on judgement calls.lollmao
>>65117759Go run the fluid dynamic equations for chamber and barrel pressures during a firing event for every possible combination of powder, primer, bullet weight, and atmospheric condition. Now throw in the variables inherent in powder manufacturing and charge weight. Now redo the calculations for 300 rounds fired without barrel cooling for every condition. Now tell me how to calculate what amount of pressure reduction is needed, at what rate, at what point in the system, to acheive what you're asking.Or just use subsonic ammo.
>>65119116In the immortal words of Blade, "some motherfuckers always trying to ice skate up hill."
>>65117759>Why hasn't the idea of using guns with optionally vented barrels (to slow full power loads to subsonic) been more thoroughly pursued?It's got more "moving parts" then I think you might be giving it credit. In principle yes, you could have an adjustable bleed that would reduce barrel pressure enough to keep a supersonic load from actually going supersonic. But:•How do you calibrate this, check it and then deal with the practical reality of ammo it'd be used with? When I chrono cheap factory ammo, I regularly see +/- 70-100fps flyers. That's easily enough to take something subsonic and push it super sonic. For super stuff you can just go as hard as you can that's easy, but for sub you need to stay below an arbitrary level that depends on atmospheric conditions, usually underballed at 1050fps just to be safe. If you're dealing with variable stuff, barrels and so on you're going to either need to REALLY underball it to be safe even with error, or else have some sort of built-in measuring system, or go to more expensive ammo loaded more consistently and tuned for the the platform. But if you're going to go to that much trouble, is that worth it vs just giving someone some subsonic mags?• You need a control system for this that can be used on the fly reliably. Inevitably there will be issues with that.• Is SUBsonic specifically important? Because you can deal with stuff like penetration or ricochets in risky situations with loads vs velocity. Conversely, if subsonic really is important then isn't it worth just loading a specific subsonic mag?basically: Is it actually saving anything real and solving any real problem worthy of the approach?
>>65117759If you wanted to actually do it correctly and not half-ass it with existing platforms you'd have to use electrical ignition and ESP https://techport.nasa.gov/projects/10782 derived propellant
>>65117759Because it's retarded.
>>65117759Because that'd be annoying engineering to do for a feature which would have no fucking useful purpose, and which would have unimaginable problems.>>65117814Retarded.>>65117819He's not understanding it, but in fairness your idea is so stupid that it's easy to misinterpret because people want to assume that your idea is less retarded than it actually is.Guns like the MP5SD have no adjustments to this at all, rather it has FIXED ports in the barrel to bleed off pressure into the integrated blast chambers to ensure subsonic muzzle velocities.>>65119128Good points.
>>65117759Holy shit OP is dumb, this has been a standard feature on US military rifles for 50 years. There is a button on AR platforms above the handle, if you hold it down with your thumb it locks the bolt to increase the velocity. SF guys even have ammo that is subsonic unless that button is pushed so they can do suppressed short range fire or high velocity long range shots. Just go to a range that rents guns and try it out you no gunz fag.
