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Posted: 10/10/2021 10:45:55 AM EDT
 Attached File Attached FileFirst things first, disassembly, rust removal, and then removal of the bore obstruction and repair of demil hole. |
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Posted: 10/10/2021 12:26:47 PM EDT
[Last Edit: Alaska-Shooter]
[#1]
 Very cool. Has anyone found a way to reload and fire a round for these yet? |
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Posted: 10/10/2021 1:08:06 PM EDT
[#2]
Subscribed to this interesting thread! Thanks for doing it.
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Posted: 10/10/2021 1:21:38 PM EDT
[#3]
Quote HistoryOriginally Posted By mwarnick1: Very cool. Has anyone found a way to reload and fire a round for these yet? From some US Army lab reports I found, the nominal chamber pressure is 10kpsi with factory rounds. So, the only thing I know is I have 84mm and 10kpsi to work with as limitations. I intend to explore the medium. My main goal is to use this as a test platform for subcal designs Ive conceived of. And also explore the viability of 3d printed cases and payload enclosures for chalk and other options. |
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Posted: 10/10/2021 1:25:48 PM EDT
[#4]
Side note: every fucking screw is staked on here. Big pain in the ass.
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Posted: 10/10/2021 2:07:23 PM EDT
[#5]
I’m looking forward to seeing what you come up with
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Posted: 10/10/2021 2:15:33 PM EDT
[#6]
You and me both. I have a day set aside later this month to finish the RPG-2
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Posted: 10/10/2021 2:28:27 PM EDT
[#7]
Quote HistoryOriginally Posted By Skinnywater: Subscribed to this interesting thread! Thanks for doing it. |
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Posted: 10/10/2021 3:12:50 PM EDT
[#8]
Removed the bore obstruction and starting the very time consuming and precise matter of restoring the rifling at the muzzle.
 Attached File Attached File Attached File Attached File |
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Posted: 10/10/2021 4:26:15 PM EDT
[#9]
Whats the plan for restoring the rifling?
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Posted: 10/10/2021 4:56:07 PM EDT
[#10]
I'm using a half round bastard file to get it around the height of the rifling lands. Then bust out my precision needle files made in W Germany.
 Attached FileRealistically good enough is good enough as I never anticipate getting my hands on factory ammo. But I'll give it my best. |
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Posted: 10/10/2021 6:50:28 PM EDT
[#11]
And in a case of absolute serendipity, I have a square file that fits the grooves of the rifling perfectly.
 Attached File |
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Posted: 10/10/2021 7:17:35 PM EDT
[#12]
Quote HistoryOriginally Posted By Wingnut116ACW: And in a case of absolute serendipity, I have a square file that fits the grooves of the rifling perfectly.https://www.ar15.com/media/mediaFiles/29456/20211010_174017_jpg-2125340.JPG That’s hot |
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MT, USA
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Posted: 10/10/2021 7:31:09 PM EDT
[#13]
Quote HistoryOriginally Posted By Wingnut116ACW: And in a case of absolute serendipity, I have a square file that fits the grooves of the rifling perfectly.https://www.ar15.com/media/mediaFiles/29456/20211010_174017_jpg-2125340.JPG Honestly if you didn't - the solution would have been to grind one to fit. There's no easy way to fix rifling like that but it doesn't have to be perfect. Just make sure it's fairly uniform and doesn't stand proud or have burrs and you're golden. I like your idea to go more with using the rifle as a subcal host than trying to start from scratch with very little info. Chamber pressure 10kpsi - that's a mighty large amount for a chamber that size and with such a large thin bore. I knew these beasts were serious but yikes. Good thing you have experience with grenades. Just make sure this one doesn't explode. 
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Posted: 10/10/2021 8:56:08 PM EDT
[#14]
And the capacity to fling a couple pound smoke pot a couple hundred yards using 3d printed nylon parts is on the punch list as well. DIY OC smoke mix is on the list too.
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Posted: 10/10/2021 9:56:24 PM EDT
[#15]
@DK-Prof
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Posted: 10/10/2021 10:10:02 PM EDT
[#16]
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OR, USA
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Posted: 10/10/2021 10:11:11 PM EDT
[Last Edit: JonathanwFL]
[#17]
Best of luck with the project, can’t wait to see the end results
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Posted: 10/10/2021 10:13:57 PM EDT
[#18]
OST
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Posted: 10/10/2021 10:14:17 PM EDT
[#19]
The best part of this project is that he has an INTACT firing pin!!
 He’s very lucky the part didn’t get “lost” while the gun was stored at an unspecified location. 
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Posted: 10/11/2021 6:36:39 AM EDT
[#20]
Quote HistoryOriginally Posted By DK-Prof: The best part of this project is that he has an INTACT firing pin!! He’s very lucky the part didn’t get “lost” while the gun was stored at an unspecified location. Once I get the firing pin in hand (shipped separately), I'll take a look at it, drink on it, and see how I could reproduce or simply. |
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Posted: 10/11/2021 7:15:52 AM EDT
[Last Edit: eodinert]
[#21]
Most epic.
I'd make a sled to hold a dremel with a cutoff wheel a prescribed distance off of the rifling... not sure how I'd go after the stuff between the rifling, but it wouldn't be with a hand file. |
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Posted: 10/11/2021 8:33:52 AM EDT
[#22]
Quote HistoryOriginally Posted By eodinert: Most epic. I'd make a sled to hold a dremel with a cutoff wheel a prescribed distance off of the rifling... not sure how I'd go after the stuff between the rifling, but it wouldn't be with a hand file. My approach will be slow and steady. I have really honed my dremel skills with my 240 and Sten builds. Need to pick up a few grinding stones and find my flex shaft. I'll be spending a full day down with Rudy this month to futz around with the RPG2 and your round. I haven't forgotten and the old man needs to recover from Knob Creek before pressing him into action. Thankfully, I'm close to him after moving over the summer. |
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Posted: 10/11/2021 11:30:34 AM EDT
[#23]
Quote HistoryOriginally Posted By Wingnut116ACW: Once I get the firing pin in hand (shipped separately), I'll take a look at it, drink on it, and see how I could reproduce or simply. Quote HistoryOriginally Posted By Wingnut116ACW: Originally Posted By DK-Prof: The best part of this project is that he has an INTACT firing pin!! He’s very lucky the part didn’t get “lost” while the gun was stored at an unspecified location. Once I get the firing pin in hand (shipped separately), I'll take a look at it, drink on it, and see how I could reproduce or simply. I am VERY interested in your thoughts on that. My pin is currently somewhat jury-rigged (jerry-rigged?), and I would love to have another. |
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MT, USA
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Posted: 10/11/2021 12:22:27 PM EDT
[#24]
Quote HistoryOriginally Posted By Wingnut116ACW: Once I get the firing pin in hand (shipped separately), I'll take a look at it, drink on it, and see how I could reproduce or simply. Quote HistoryOriginally Posted By Wingnut116ACW: Originally Posted By DK-Prof: The best part of this project is that he has an INTACT firing pin!! He’s very lucky the part didn’t get “lost” while the gun was stored at an unspecified location. Once I get the firing pin in hand (shipped separately), I'll take a look at it, drink on it, and see how I could reproduce or simply. There are at least a few of us here that are also willing to turn some out as needed - assuming accurate dimensions can be provided. |
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Posted: 10/11/2021 12:26:14 PM EDT
[#25]
This design, and the resultant mechanism has been largely unchanged since it was designed 75 years ago. This was a design that had to persist through a few iterations of changes over the decades in the name of backwards compatibility. The fact that the firing system dovetails into the tube, allowing for complete replacement gives me pause to consider the potential plethora of options. I just need to get the rest of the parts in hand, a fifth of Evan Williams, and some pencil and paper.
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Posted: 10/11/2021 3:37:03 PM EDT
[#26]
Quote HistoryOriginally Posted By Third_Rail: There are at least a few of us here that are also willing to turn some out as needed - assuming accurate dimensions can be provided. Quote HistoryOriginally Posted By Third_Rail: Originally Posted By Wingnut116ACW: Originally Posted By DK-Prof: The best part of this project is that he has an INTACT firing pin!! He’s very lucky the part didn’t get “lost” while the gun was stored at an unspecified location. Once I get the firing pin in hand (shipped separately), I'll take a look at it, drink on it, and see how I could reproduce or simply. There are at least a few of us here that are also willing to turn some out as needed - assuming accurate dimensions can be provided. It’s a very complicated shape. It cannot be done on a lathe alone. |
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Posted: 10/11/2021 3:41:23 PM EDT
[#27]
I wonder who in the US could make barrels…and would.
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MT, USA
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Posted: 10/11/2021 4:18:20 PM EDT
[Last Edit: Third_Rail]
[#28]
Quote HistoryOriginally Posted By DK-Prof: It’s a very complicated shape. It cannot be done on a lathe alone. Quote HistoryOriginally Posted By DK-Prof: Originally Posted By Third_Rail: Originally Posted By Wingnut116ACW: Originally Posted By DK-Prof: The best part of this project is that he has an INTACT firing pin!! He’s very lucky the part didn’t get “lost” while the gun was stored at an unspecified location. Once I get the firing pin in hand (shipped separately), I'll take a look at it, drink on it, and see how I could reproduce or simply. There are at least a few of us here that are also willing to turn some out as needed - assuming accurate dimensions can be provided. It’s a very complicated shape. It cannot be done on a lathe alone. Oh that's right. You've even told me that more than once over the years. Originally Posted By Ryan_Scott: I wonder who in the US could make barrels…and would. At 84mm like that? Any manufacturer of 4100 series or similar MLR tubing. It would be on a custom basis. |
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Posted: 10/11/2021 4:28:05 PM EDT
[#29]
Quote HistoryOriginally Posted By Third_Rail: Oh that's right. You've even told me that more than once over the years. . You’re right! I think we’ve talked about it in the past! Curse my old man memory!
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Posted: 10/11/2021 6:06:42 PM EDT
[#30]
Quote HistoryOriginally Posted By Ryan_Scott: I wonder who in the US could make barrels…and would. Well. How attached to rifling are you? |
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Posted: 10/11/2021 9:09:35 PM EDT
[#31]
I mean - if you're not using a factory round, kick out a rocket w/ a recoiless charge of black powder, and turn on the spinny rockets - poof! Spin stabilized, no rifling.
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Posted: 10/11/2021 9:20:29 PM EDT
[#32]
 Attached FileFinally have a bare tube. Broke two new craftsman screwdrivers, had to drill a screw, and have one stubborn one left to remove on the cone. I need to source some G10 blocks to fabricate some grips and knobs for the locking mechanism and blast deflector. |
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Posted: 10/11/2021 9:26:52 PM EDT
[#33]
Nice!
It’s definitely hard to remove the cone.
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Posted: 10/11/2021 9:53:15 PM EDT
[#34]
Quote HistoryOriginally Posted By DK-Prof: Nice! It’s definitely hard to remove the cone. The screw holding the main screw was seized. Had to drill it. Was a pain in my ass. Old, rusted, staked, and soft metal fasteners have done me no favor. |
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Posted: 10/11/2021 10:25:01 PM EDT
[#35]
Quote HistoryOriginally Posted By Wingnut116ACW: And the capacity to fling a couple pound smoke pot a couple hundred yards using 3d printed nylon parts is on the punch list as well. DIY OC smoke mix is on the list too. Tagged for DIY OC smoke mix recipe. Don't make me beg.
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Posted: 10/11/2021 10:29:00 PM EDT
[#36]
Quote HistoryOriginally Posted By DK-Prof: I am VERY interested in your thoughts on that. My pin is currently somewhat jury-rigged (jerry-rigged?), and I would love to have another. Quote HistoryOriginally Posted By DK-Prof: Originally Posted By Wingnut116ACW: Originally Posted By DK-Prof: The best part of this project is that he has an INTACT firing pin!! He’s very lucky the part didn’t get “lost” while the gun was stored at an unspecified location. Once I get the firing pin in hand (shipped separately), I'll take a look at it, drink on it, and see how I could reproduce or simply. I am VERY interested in your thoughts on that. My pin is currently somewhat jury-rigged (jerry-rigged?), and I would love to have another. I thought someone got involved to make some? Any pics? I thought I offered to try my hand at one. |
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Posted: 10/11/2021 10:30:56 PM EDT
[#37]
Quote HistoryOriginally Posted By DK-Prof: It’s a very complicated shape. It cannot be done on a lathe alone. I'll add that SLS Metal 3D printing is wildly affordable now. |
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OR, USA
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Posted: 10/12/2021 8:47:21 AM EDT
[#38]
Quote HistoryOriginally Posted By Wingnut116ACW: Well. How attached to rifling are you? Could ECM the rifling with the use of a 3d printed sections like they do the FGC 9 barrel on a larger scale |
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Posted: 10/12/2021 9:37:18 AM EDT
[#39]
Quote HistoryOriginally Posted By fmj_shooter: I thought someone got involved to make some? Any pics? I thought I offered to try my hand at one. Quote HistoryOriginally Posted By fmj_shooter: Originally Posted By DK-Prof: Originally Posted By Wingnut116ACW: Originally Posted By DK-Prof: The best part of this project is that he has an INTACT firing pin!! He’s very lucky the part didn’t get “lost” while the gun was stored at an unspecified location. Once I get the firing pin in hand (shipped separately), I'll take a look at it, drink on it, and see how I could reproduce or simply. I am VERY interested in your thoughts on that. My pin is currently somewhat jury-rigged (jerry-rigged?), and I would love to have another. I thought someone got involved to make some? Any pics? I thought I offered to try my hand at one. …and dimensions. |
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MT, USA
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Posted: 10/12/2021 11:25:24 AM EDT
[#40]
Quote HistoryOriginally Posted By JonathanwFL: Could ECM the rifling with the use of a 3d printed sections like they do the FGC 9 barrel on a larger scale Quote HistoryOriginally Posted By JonathanwFL: Originally Posted By Wingnut116ACW: Well. How attached to rifling are you? Could ECM the rifling with the use of a 3d printed sections like they do the FGC 9 barrel on a larger scale Yes - absolutely. I still say going with custom MLR tubing is the way to go. At such large sizes it's cheap enough to have a run done - assuming there's enough interest in it. |
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Posted: 10/12/2021 4:05:27 PM EDT
[#41]
Quote HistoryOriginally Posted By Wingnut116ACW: I'll be spending a full day down with Rudy this month to futz around with the RPG2 and your round. I haven't forgotten and the old man needs to recover from Knob Creek before pressing him into action. Thankfully, I'm close to him after moving over the summer. Sweet! Someday when I quit working overseas, I'll have time to shoot mine. I'm curious to check the location of my firing pin with that projectile, and see how close I got. That's the only round I've ever found that located the primer so precisely. |
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MT, USA
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Posted: 10/13/2021 11:35:12 AM EDT
[Last Edit: Third_Rail]
[#42]
I had an odd thought this morning and I want to throw it out there before I forget entirely: does anyone feel like measuring and drawing the case and projectiles? If so I - or anyone with QL/QD - could input the data and start looking at known powders to get a baseline idea of the internal ballistics.
ETA: For anyone unfamiliar with QuickDESIGN here's example data from .308 Winchester. That's the thoroughness of data needed.    |
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Posted: 10/13/2021 1:42:52 PM EDT
[#43]
Quote HistoryOriginally Posted By Third_Rail: I had an odd thought this morning and I want to throw it out there before I forget entirely: does anyone feel like measuring and drawing the case and projectiles? If so I - or anyone with QL/QD - could input the data and start looking at known powders to get a baseline idea of the internal ballistics. ETA: For anyone unfamiliar with QuickDESIGN here's example data from .308 Winchester. That's the thoroughness of data needed. https://i.imgur.com/PfDIovK.png https://i.imgur.com/ViBFVSO.png https://i.imgur.com/loI9IxN.png That would be a handy place to start working up loads. And that data would be invaluable to start with. Ultimately I need the case modeled so I can print one or two in Nylon to test viability. For projos like chalk, nylon would work like a champ. I Think it would work for cases as well |
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MT, USA
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Posted: 10/13/2021 1:56:46 PM EDT
[Last Edit: Third_Rail]
[#44]
Quote HistoryOriginally Posted By Wingnut116ACW: That would be a handy place to start working up loads. And that data would be invaluable to start with. Ultimately I need the case modeled so I can print one or two in Nylon to test viability. For projos like chalk, nylon would work like a champ. I Think it would work for cases as well Quote HistoryOriginally Posted By Wingnut116ACW: Originally Posted By Third_Rail: I had an odd thought this morning and I want to throw it out there before I forget entirely: does anyone feel like measuring and drawing the case and projectiles? If so I - or anyone with QL/QD - could input the data and start looking at known powders to get a baseline idea of the internal ballistics. ETA: For anyone unfamiliar with QuickDESIGN here's example data from .308 Winchester. That's the thoroughness of data needed. https://i.imgur.com/PfDIovK.png https://i.imgur.com/ViBFVSO.png https://i.imgur.com/loI9IxN.png That would be a handy place to start working up loads. And that data would be invaluable to start with. Ultimately I need the case modeled so I can print one or two in Nylon to test viability. For projos like chalk, nylon would work like a champ. I Think it would work for cases as well Are the cases that expensive these days? I last saw them for somewhere around a hundred bucks with inert projectiles. ETA: That question assumed that the inert examples are even intact enough to use. That may not be the case - I've not disassembled any of mine and I don't intend to. |
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Posted: 10/13/2021 4:12:56 PM EDT
[#45]
 Attached FileDamned screws holding on the optic mounting plate are a weapons grade bitch. Broke two screw drivers and now a broken screw extractor |
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MT, USA
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Posted: 10/13/2021 4:33:46 PM EDT
[#46]
Drill them out totally and bush?
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Posted: 10/13/2021 4:45:13 PM EDT
[#47]
Tried and then tried smacking with a hammer. No joy. So I thought there must me something else hanging up.
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MT, USA
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Posted: 10/13/2021 4:56:32 PM EDT
[#48]
Quote HistoryOriginally Posted By Wingnut116ACW: Tried and then tried smacking with a hammer. No joy. So I thought there must me something else hanging up. I mean drill past the threads then bush both parts and tap new threads. You have to know when to give up on things like that. |
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Posted: 10/13/2021 10:02:15 PM EDT
[#49]
Okay, riddle me this. There is some pitting on the tube. The worst is in the bottom pic. Worry about it? Repair it? Let it roll? I'm no expert on pitting.
 Attached File Attached File |
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Posted: 10/13/2021 10:04:17 PM EDT
[Last Edit: Wingnut116ACW]
[#50]
Secondary thought: Anyone have a cheek pad that I could get dimensions off of or borrow? My launcher is also missing the shoulder rest/bipod attachment point. Anyone have pics of one?
I have a guy that will be able to make me a sling and a cheek pad out of top quality leather. Id rather have a pattern than let him wing it, but he made a fantastic padded leather sling for my MAG58 build. |
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