Thompson 80 receiver machining25.10.2020
The receiver or frame is the part of the firearm that can be controlled by the Gun Control Act ofthe same act that ensures your right to manufacture firearms at home. An AR15 80 lower is a receiver blank that is machined as far as you can without legally becoming a frame or receiver and would then require to be transferred to an FFL.
A lower parts kit will not even fit in an AR15 80 lower until it has been machined into a complete firearm. The AR15 80 Percent Lower Receiver started it all, this was the first commercially available receiver on the market and had a determination from the ATF saying it was not a firearm.
We lead the way by including a flared magwell, using high quality aluminum products and cnc machined the lower receiver on our milling machine. Every receiver we manufacture meets our precise quality control standards.
For our Lowers we have two options, a billet aluminum option and a Cerro forging like our AR platform. All of our 80 ar lower products are machined in house on state of the art milling machines. Unlike many of our competitors, we machine the parts in-house, which gives us the ability to offer the most competitive pricing.
What is a billet or what are billet lowers? A billet is a term for a solid block of metal with no features at all, almost as raw as metal can get. A forging on the other hand is a piece of billet that has been pounded into shape by a die on a forging press.
It requires less machining because it has been shaped into a receiver blank, and has the advantage of the metal grains following the shape of the part. But that really doesn't mean all that much except to your wallet. Forgings offer significant cost savings and no real drawback for the end user. Our AR 80 ar lowers are both offered as forged lowers and billet lowers depending on what your price range is.
Cosmetics aside, there isn't a huge difference between billet aluminum and forged aluminum other than price and freedom of design. With that said, the billet lower receiver does have the advantage of having all sides machined in the milling machine and in some cases allows you to add features like an extremely flared magwell or an ambidextrous bolt catch. A billet lower receiver normally is purchased because of it's cosmetic appeal.
Other manufacturers offer a billet lower receiver that may suit your needs, we only offer billet aluminum options in the TM and AR platforms. Some forgings are designed for companies and include those features like the flared magwell as well. Again, it really is a draw, there is no clear winner here. Many of our platforms include the option for an anodized receiver or a raw aluminum receiver. After our parts have been cnc machined they are then taken to laser engraving if necessary and finally sent off to be coated.
There are several real coating options both commercially available and available for the home gunsmith. Mil spec Hard Coat Anodizing is a great option and will match any of the ARs already in your collection and many of the parts purchased from other companies. It is an extremely durable coating and has extreme hardness and great wear resistance. I would consider it middle of the pack for a coating option. Better than bare aluminum not quite as good as hard coat or Cerakote.
Posted 09 June - PM.
Please log in to reply. From what I can gather, this requires a semi-auto trigger group as the full auto set-up as found in the parts kit will not work. That being the case, it appears quite impractical to even consider doing this as one might as well go out and buy a semi AO or Kahr and forget the headaches involved in machining.
I have Richardson 27A1 that has been completed into a functioning semi-auto receiver.
AJ machine will do this for you. If you remove the butt stock and permanently alter your lower so you can never install it again, you can even keep the short barrel. Or install a 16 inch barrel and use the butt stock. Basically three of us have said with one icon, what took you words Ah, waddu I know. I can't put the guy on every post! Not a very good first post I would say Maybe the next one will be better informed I'm hoping the single shot open bolt part was done tongue in cheek I don't know about shooting this thing.
AR15 80 Percent Lower Receivers
The stock looks unforgiving! I found this photo at UZItalk. The barrel looks shorter than 18 inches and I think the over-all lenght of a shotgun has to be 26 inches. Shooting my SBS is scary enough as it is and it is a "break breach" gun. I would be hesitant to fire a "slam fire" 12 gauge. Posted 15 June - PM Hmmmm. I have seen more than one advertisement for them stating they could be built into functioning semi-auto receivers.
Since they can't be built into full auto subguns, OR semi-auto receivers, that makes them a VERY expensive dummy receiver, or a very expensive paperweight. This may sound trite, but you cannot reweld pieces of original Thompsons together to make a semi-auto - the feds won't allow that. Some have even made guns in different calibers. But many have used any number of "transplanted" gun mechanisms to achieve semi-auto, from M-1 Carbines, Garands, Ithaca M37, Remington M, and even made their own action parts.High Quality Thompson Welding Jig.
The perfect jig to help at home welders hold everything in place while you weld your receiver. Jig is machined to the exact dimensions of the inside of the receiver. The first small block on the front of the jig is the exact measurements of the inside of the Thompson magwell.
It was designed this way to take all the guesswork out of the placement of the nose piece for welding. Correctly aligning the parts and holding everything together while welding is the two hardest part of any build, this jig helps make that easier. It will work with all receivers as long as they are made to original specs and can be used multiple times. Each jig comes with all the necessary hardware to install the jig for standard SMG and semi-auto.
So whether you are making an NFA post sample, or a semi auto, this jig has you covered! The jig was also designed to be placed back inside the vice of a mill to start the cleanup of the outside welds. The legal construction and possession of a fully automatic firearm is controlled by the B.
Treasury Department. Proper application, if required, to the B. Local and State laws vary and may restrict ownership of this or similar firearms. Possession of this template, tube, and a parts kit may constitute possession of a machine gun, EVEN if it is not assembled and the receiver is incomplete. This material s is for informational purposes only. Excellent person to deal with, great communication, I would not hesitate to buy from them again.
Thank you very much. Nathan Pressley — December 14, Mike Clark — December 17, Very nice craftsmanship. It really does exactly what he says it does.
Buying the M1 Jig right now. Juan M Zavala — December 21, Your email address will not be published. GOV Or Call 1. Additional information Weight 3. Rated 4 out of 5. Rated 5 out of 5.
Product was exactly as advertised, Good communication, sturdy packaging!! I would highly recommend this jg to anyone looking to buy one. Worked flawlessly the first time.My Favorite Links.
Machinegun Books. If you own a Thompson of any make or style, you must join up with the "The American Thompson Association". Click the logo to go to the NEW website and join today.
NFA Firearms for Sale. Knob Creek Gun Range. Have a picture or two of you and your guns? Email it to me and I'll put it on the website. Have something Thompson related you found in a closet? Not sure what it is? Email me, I might be able to help, you never know. I also buy Thompson guns. I am a collector not a dealer. Thank You. Page 2. Page 3. Click On For Larger Image. Thompson Stocks.
Do you need new wood for your Thompson? Well who doesn't? Dan makes great stocks and grips for your Thompson to show off or just as a backup set to have. I won't tell you where or who, but it is very nice and purchased from the 2nd owner, a very elderly gentleman.
The "Irish Sword" Thompson's. A unique photo of four "Irish Swords" all Brothers in Arms. Note the "first " Aut-ord-Co bullet logo on the top of the receivers. This little history was written by Theodore Eickhoff about his experience with John Thompson and developing the Thompson sub machine gun.Remember Me?
What's New? Forum Gunboards. Results 1 to 9 of 9. Thread: Question about Thompson parts kits. Join Date Feb Location An octopus's garden in the shade.
Posts 8, Question about Thompson parts kits. I've seen ads for the A1 parts kits that come with dummy receivers. My question is if you replace that receiver with one that can withstand the pressures of being fired are they fully or semi-auto? I wouldn't buy one but it has me curious. They say they use genuine WWII parts except for the receiver so I figure that they must be automatic if equipped with a proper receiver. Join Date Dec Posts In the United States, installing the MA1 Thompson parts into a "proper receiver" would make the weapon select fire and unless the receiver was previously registered prior to the ban on machine guns, the stripped receiver itself is contraband.
The receiver alone is considered a machine gun, with or without the installed parts. I didn't know the receiver itslef was considered a machine gun, I thought it was all the parts coming together that made it considered a machine gun. But then again I guess without the receiver it isn't really considered a gun.
The last gun show I was at there was a guy saying that he had the Thompson receivers he was selling machined for him. Sponsored Links Remove Advertisements. Dummy receivers aren't considered machine guns because they are not machined to accept the Thompson bolt or accuator, that part of the receiver being left solid.
Join Date Sep Posts The upper receiver of a is what makes it a machine gun, it is the part stamped with the serial number. You can not buy a parts kit and add a modern made receiver to it and make a new machine gun, with a lot of work you could, but you might spend the next ten years in prison with a new boyfriend.
You can use the USGI parts to build a semi auto. The full auto bolt is worthless in this conversion. The only Thompson upper receivers on the market are the semi auto's from Thompson. You would also need their semi auto bolt and etc. The full auto bolt will not fit. Therefore, it still isn't a machine gun.Right to Bear Arms and Supply has lower receiver jigs and 80 percent lower receivers for sale with the highest quality and most competitive prices available anywhere else online.
We have AR15 lower receiver kits, including the Cerro Forge 80 lower, with options for titanium Cerakote, bead blast finish or anodized coatings. Our lower receivers give you the option to upgrade your AR15 with a replacement that will last longer and provide fewer maintenance issues than other less durable lower receivers. Our AR15 80 percent lower receivers are not firearms.
Our AR15 lower receiver kits will ensure that your builds are completed with parts made using precision measurements, providing the exact specifications you need to fit perfectly into your AR15 assembly with easy installation. Our 80 lowers are available in Daytona with tactical accessories and tactical machining.
Buy today or give us a call for more information about our 80 percent lower receivers for sale. Please note: Some states may not allow you to legally manufacture a firearm without a serial number like the state of NJ. Please be sure to do your due diligence and make sure you are following your state and local laws before attempting to manufacture a firearm.
This is not intended and should not be construed as an advertisement or offer for sale of any of our products to New Jersey residents or any person in New Jersey. AR15 80 Percent Lower Receivers Right to Bear Arms and Supply has lower receiver jigs and 80 percent lower receivers for sale with the highest quality and most competitive prices available anywhere else online.Galil Galil These are just some pics of the semi selector mechanism from a commercial galil. Both green mountain bbls in all three ORF receivers I have indexed and headspace properly on the go gauge with.
Since the semi safety parts arenot comonly available I opened up the hole in the receiver to use the original left side selector.Thompson 1928 / Thompson 1928a1 / Thompson 1928 receiver, part 1/ How to build a Thompson 1928
These are just some pics of the semi selector mechanism from a commercial galil. Here are the new bolt handles from Sarco silver soldered in place. If you look at the pic the red arrow points to a radius that is to large to allow the orlite to fit all the way forward allowing the rear to swing up into place.
I want to point out again that the mag catch assembly on the IMI guns sits. The two shiney spots at the front corners of the magwell represent the material that needs to be removed to allow the mag to move forward.
If you look at the back of the mag in this pic you will see it contacts the magcatch body with no room to spare. The customer wanted to be able to use an AR mag adapter which poses additional problems with an ORF receiver. The IMI magwell opening is the same width front as rear and does not narrow like a coventianal ak receiver.
The ORF receiver as pointed out above narrows at the front so insertion of the AR maga adapter is impossible. The other major problem is the AR mag adapter is. Usualy when fitting an AR mag adapter to the Galil you just hit the rear a few strokes with a file and it will snap right in place.
To fit the mag adapter to the ORF receiver I start by machining the reduced width portion of the magwell to the same width as the rear. The shiny spots in this pic are where the material needs to be removed.
If you look at the pic above you will notice the lug on the front of the mag adapter has sqaure corners and the slot it fits in is a gentle radius.
1928A1 Thompson Receiver 80%
I have to round the corners on the magwell adapt to get it to fit properly. It snaps right in the IMI gun so there is a difference there also. The last thing You will have to do untill ORF moves the nag catch assembly back the proper ammount is grind the front edge of the magcatch housing slightly to allow the proper clearance at the rear.
I would like to point out these problems exist in the guns I have built using brand new unissued IMI parts ans well as the sets Century is currently selling.