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Post by wordweaver3 on Jan 6, 2019 20:17:30 GMT
A short jet of air accompanied by a rod pressing through to knock out anything more stubborn might do the trick. Though the issue with a system that shoots air through to clear any debris could be that it might actually introduce particles from the surroundings. Which could be a problem in wet or dusty conditions.
It shouldn't come as a surprise that I'm fiddling with some design ideas regarding this. I was thinking the most elegant rotating cylinder would have three chambers. One in the process of loading one firing and one clearing. Each one has locking lugs to lock the cylinder into the barrel. The rear of each chamber is mostly closed off (with no brass cartridge there's no rear seal, and I'm imagining a gas system so it needs to seal up) with just a small hole in the center for the clearing punch during the "extraction" stage or a firing pin if that turns out to be the most viable ignition type. The magazine would be under the barrel of the firearm and would load directly into the front of the cylinders.
There is one major flaw that I can see in the design so far. If the weapon was made for automatic fire and the 3 cylinder system didn't stay below cook off temperature the weapon could discharge out of battery. Meaning the cylinder that is getting loaded could ignite before rotating into the barrel. Which would fire a round right into the magazine and possibly into the shooter's hand. The solution to that would be to determine exactly how much it can fire before that happens and regulate the fire control accordingly, though even then it could be a killing blow to the weapon system.
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Post by Horsie on Jan 7, 2019 6:27:21 GMT
Plus it'd make things more complex if you had two systems to clear the chamber. Not sure if it'd be a good idea to have the chamber closed up at the back like that, you'd want clearing rod that fills the chamber, rather than a firing pin sized rod, it'd work fine if you were only concerned about unfired cartridges, but anything smaller (most likely primers that haven't followed the bullet out of the chamber) would be sitting at the bottom of the chamber.
What I was envisioning was something more like a revolver, the chambers would be open at the back, the firing position would have a breach face blocking the rear of the chamber with a hole for the firing pin, for the rest of the cylinder's cycle there'd be a backing plate covering the backs of the chambers, with a hole behind the clearing position for the rod or brush to pass through the chamber.
Though I'm thinking sealing the chamber might be an issue, whether the chamber is open at both ends or not, at least with conventional cartridges you can rely on the casing for obturation.
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Post by wordweaver3 on Jan 7, 2019 7:53:48 GMT
The thing is that revolvers rely entirely on the brass case to seal the breach.
If it used an electronic ignition there wouldn't be the issue of the primer case possibly floating around. The bullet could also be designed with the primer affixed directly to it so has to get carried out when fired. I like the idea of a closed breach because it simplifies the design if I don't have to work out a mechanism that seals it.
Though I suppose it could have locking lugs on both the front and rear of the chambers and when the mechanism slams forward to lock into battery it also locks a breach/firing pin assembly into the rear, sealing the whole thing. Then having a squeegee type plunger poke through on each cycle wouldn't be a problem.
Though there's still the issue of a steel to steel seal. The system would still vent quite a bit unless the machining was absolutely precise. And if it's too precise a small amount of fouling or temperature change during firing would cause it to seize up. There could also be flame cutting through the gaps in the seal.
Though I suppose it would be about like a revolver at that point.
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Post by Horsie on Jan 11, 2019 22:04:36 GMT
Had a look at an M1917 someone stuck a scope on, the whole rear sight base was machine into a dovetail, and another dovetail was added to the barrel a few inches forward of the receiver, it still had the full wood stock so a square hole was cut in the handguard.
It had an old 10x Unertl scope like this one;
It was actually a really nice setup as far as M1917/P1914 rifles modified to mount optics go. Normally the rear sight base is just machined down flat, but with it modified into a dovetail you could probably fit a target sight on there if you wanted to use irons.
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Post by wordweaver3 on Jan 14, 2019 6:19:29 GMT
What's that spring do? Is it some sort of recoil protection for the scope?
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Post by Horsie on Jan 14, 2019 7:45:26 GMT
Close. The scope is free to move forward in the mount due to inertia when the rifle recoils (or rather it stays in place and the rifle moves backward), other scopes of this type had to be manually pulled back into place after every shot, but ones with a spring reset automatically.
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Post by wordweaver3 on Jan 15, 2019 23:24:47 GMT
I know that Unertl scopes are supposed to be great, but the idea of a sliding scope flies in the face of everything I've ever thought about a scope on a rifle. Seems like it would cause issues if it slides around. Though I suppose getting scope bit by that would be far less severe than a typical scope.
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Post by Horsie on Jan 16, 2019 16:15:59 GMT
The front ring has a keyway that matches up with a key on top of the scope, so it can slide front and back but it can't twist to one side or the other. If you don't pull the scope back and reset it after one shot then the point of impact will be different on the next, but since you're always putting it back in the same position it should hold zero.
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Post by Horsie on Jan 17, 2019 10:10:54 GMT
I'm thinking I might save up for an M1A, I tried getting one a few years back but only one place had them listed at the time and the standard model was going for about $3K. I just feel I need another battle rifle.
Right now there's quite a few places that carry the standard model and a few that have the national match, for $2100 and $2600 respectively. I'll see what I can find for used rifles, but I get the feeling I'll probably be spending about the same as I would for a new rifle, I've seen a couple of ads and guys usually sell them with a bunch of accessories, gear, and optics.
I was considering a Chilean FAMAE .308 battle rifle based on the SIG 542, but parts and accessories for that are going to be pretty limited, and they're not exactly set up to be target rifles either.
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Post by wordweaver3 on Jan 19, 2019 2:47:02 GMT
You looking to get a new Springfield or a surplus?
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Post by Horsie on Jan 19, 2019 3:00:57 GMT
New, I'm not even sure if we can get surplus M14s in Canada since the early rifles were select-fire. USGI parts aren't hard to get, I even recall a place selling parts kits that contained everything but the barrelled action, but I think the only complete rifle I've seen was prohibited.
It looks like I was wrong about the price of used rifles, I found one that's practically new with less than 200rnds through it, and if this works out I should have it shipped to my door for less than $1700, almost a grand less than a new rifle with tax.
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Post by Horsie on Jan 25, 2019 22:32:17 GMT
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Post by wordweaver3 on Jan 26, 2019 0:41:14 GMT
There are some companies out there cranking out some seriously cheap shit uppers. I'm shocked that doesn't happen more.
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Post by Horsie on Jan 26, 2019 2:24:14 GMT
At first I thought it was an out of battery discharge, but looking at it again I see the bolt carrier exploded, it's surprising buddy didn't get hurt.
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Post by wordweaver3 on Jan 27, 2019 0:15:08 GMT
Something new from DE.
This is actually a really smart move. The .50 AE has a number of shortcomings due to the proprietary slug. This severely limited its appeal to hunters and handloaders.
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