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Posted: 5/14/2016 3:16:53 PM EDT
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Rather than search for a Title 1 cup, I'm interested in making my own.
I have a copy of the machining prints for an M2 mortar cup. I have access to a retired machinist who is quite knowledgeable and interested in the project. That takes care of that. Barrel can be made or buy an already existing one. Other parts to be searched for and assembled. Most important part: I have a trust with stamps already and would like to e-file paperwork on the M2 before the 41P goes into effect this summer. Does anyone have any experience doing so? What barrel length, OAL, etc did you use? TIA. |
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Hey Mr. ATF man OP has indicated he knows how to play by NFA rules, and what he's asking is legal.... so are you saying you don't know the NFA rules, and don't know how to listen and learn? OP: While I do have my own form 1 DD projects, I don't have a mortar or know much about them. Do a goole search for the mortar you wish to duplicate. Specs for US made stuff should be readily available. Better yet, find a copy of the TM for the mortar you wish to build... the answers will be found there. |
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Hey Mr. ATF man LOL. I'm asking what OAL, barrel length etc to fill out on a F1 for something that lots of folks are interested in. On ARF's DD forum where other folks have done it and posted build threads on. Does your Daddy know you're talking to grown ups on the Internet? |
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Head over to the ReardenArmament.com forums for all the info that you need to build an m2 mortar from scratch. It is a tremendous undertaking and will likely take years. Start watching eBay for parts and accessories now. Perfecto. I'm here and on Grog's, this is what I was looking for. Thanks man. 
ETA: I'm gonna PM a follow up question. |
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-snip- Wing, the shot of your boy with your M2 sealed the deal for me. I am also getting some other stuff ahead of 41p to make sure I can pass something along to the next generation. 
Any other Form 1 specifics on an M2 are very helpful. Is there a source for brand new barrels? |
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Quoted: Wing, the shot of your boy with your M2 sealed the deal for me. I am also getting some other stuff ahead of 41p to make sure I can pass something along to the next generation.
Any other Form 1 specifics on an M2 are very helpful. Is there a source for brand new barrels? You do know that 41f won't prevent you from filing Form 1s & 4s, right? Slightly more of a pain in the ass for trusts, but still just a paperwork drill. Much easier for individuals. |
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You do know that 41f won't prevent you from filing Form 1s & 4s, right? Slightly more of a pain in the ass for trusts, but still just a paperwork drill. Much easier for individuals. Quoted:
Quoted: Wing, the shot of your boy with your M2 sealed the deal for me. I am also getting some other stuff ahead of 41p to make sure I can pass something along to the next generation.
Any other Form 1 specifics on an M2 are very helpful. Is there a source for brand new barrels? You do know that 41f won't prevent you from filing Form 1s & 4s, right? Slightly more of a pain in the ass for trusts, but still just a paperwork drill. Much easier for individuals. Yup. It's also a bit of a mental goal to have most of my NFA stuff done by then so I can focus on other things. Plus who the hell knows what's gonna happen, one side being Hillary and the other being Nolo's lawsuits. |
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Yup. It's also a bit of a mental goal to have most of my NFA stuff done by then so I can focus on other things. Plus who the hell knows what's gonna happen, one side being Hillary and the other being Nolo's lawsuits. Quoted:
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Quoted: Wing, the shot of your boy with your M2 sealed the deal for me. I am also getting some other stuff ahead of 41p to make sure I can pass something along to the next generation.
Any other Form 1 specifics on an M2 are very helpful. Is there a source for brand new barrels? You do know that 41f won't prevent you from filing Form 1s & 4s, right? Slightly more of a pain in the ass for trusts, but still just a paperwork drill. Much easier for individuals. Yup. It's also a bit of a mental goal to have most of my NFA stuff done by then so I can focus on other things. Plus who the hell knows what's gonna happen, one side being Hillary and the other being Nolo's lawsuits. There's a giu on the 1919a4 forum selling machine blueprints for the M-2 cup for iirc $25 or so shopped |
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Yup. It's also a bit of a mental goal to have most of my NFA stuff done by then so I can focus on other things. Plus who the hell knows what's gonna happen, one side being Hillary and the other being Nolo's lawsuits. Quoted:
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Quoted: Wing, the shot of your boy with your M2 sealed the deal for me. I am also getting some other stuff ahead of 41p to make sure I can pass something along to the next generation.
Any other Form 1 specifics on an M2 are very helpful. Is there a source for brand new barrels? You do know that 41f won't prevent you from filing Form 1s & 4s, right? Slightly more of a pain in the ass for trusts, but still just a paperwork drill. Much easier for individuals. Yup. It's also a bit of a mental goal to have most of my NFA stuff done by then so I can focus on other things. Plus who the hell knows what's gonna happen, one side being Hillary and the other being Nolo's lawsuits. We're in the same boat. Although I'm willing to jump through post 41F hoops, it's more like a mental stepping stone |
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Does anyone have any experience doing so? What barrel length, OAL, etc did you use? TIA. from my notes the barrel length is 25.75" long, with tube and ball overall length is 29". OD can be 2.75" with the ID of 2.392"-2.410" I'll double check what I can later Here are the basic dimensions for a U.S. 60mm mortar barrel as measured from a M2 and supplied on line at G503.com forums Outside diameter..................................................2.720" Inside diameter....................................................2.394" Diameter of threads..............................................2.835" Pitch diameter of threads.......................................2.783" Thread pitch..........................................................12 TPI Overall length of barrel..........................................25 5/8" Length of barrel protruding from base cup/receiver when screwed together...................23 15/16" Length of threaded portion from bottom end of barrel...............................................1.750" Thread size is not an English standard, if you have a Mil spec cup you will have to match it by using it as a go/no go gauge I made up a few prototypes and after 5 iterations ended up 3d printing an adapter for threaded aluminum beer bottles to use 60mm mortar fins. 
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If the round has no explosive charge, it is just solid like the M69 practice round or contains no explosive then the round its self is not an NFA item. Well less than 4 oz explosive in the projectile.
The device they are launched out of would be the DD. If you build a spec 60mm mortar and it utilizes the firing pin to initiate the launch charge it is a DD. I have been told, but not seen a determination letter, that if you use a firing pin and loaded shells of lift charge then the device is a DD. One way people get around it is they use black powder in the base of the cup as a lift charge and use a fuse to initiate. They often have the bore undersized to help aid in the argument that it can not be readily converted to a DD. |
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The barrel is actually pretty difficult to do correctly, even for full time DD manufacturers. Quoted:
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This interests me.... So a bit off topic, where does one get the associated bits like the tripod, base, sights etc? I can handle the cup and maybe the barrel. The barrel is actually pretty difficult to do correctly, even for full time DD manufacturers. M-2 barrel is pretty simple I thought...it's once you get into the barrels with the outside threads and/or cooling fins that it gets complicated |
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