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You have resolved one of the principal weaknesses of the 76 design. Only 5 or 6 more to go. 🤣 The only suggestion I can offer is that perhaps a 1/16" pin might provide more margin of safety for machining?

After getting SO MANY FBP kits without bolts from the IMA warehouse purchase, I am surprised that there are any MP40's that don't have an FBP bolt and recoil spring installed! Richard

From an estate. Everything as shown. Pick up only Boston area.

I have Grip Mounts in stock.

Drop in from my experience. YMMV.

Well thought out and very nice. I always admire quality machine work, and wish I had the skill.

Thanks for the input guys!

Here is a pic of the swivel on my Colt butt stock marked D.P.D. 6 (I assume Denver PD 6). It is the has the offset swivel. The routed space will not fit the later style swivel. I will say as disclaimer, this stock has been refinished and/or clear coated at some point so it could have been modified at some point later in it's life. But this is how I received it.

Now that I have made a dummy receiver nose and dummy barrel, it is time to start experimenting with a mechanical barrel index. Most of the indexing systems that I have seen involve a tab on one part and a corresponding notch on the other. I wanted to perform the same function, but with a less visible modification to the receiver. I came up with the idea of a pin that protrudes from the front of the receiver and a corresponding notch in the barrel collar. I first drilled an 5/64” hole in the end of the receiver nose and then reamed that hole out to 3/32” diameter. I then carefully cleaned the hole and burnished it with an oiled pin. This created just enough clearance that I could install and remove a clean 3/32” dowel pin by hand. The first couple of photos below illustrate the hole and dowel pin. I then cut a corresponding notch in the barrel collar a few thousandths of an inch wider than 3/32”. The second couple of photos illustrate the modified dummy receiver nose and barrel together. The result is a system where the indexing pin can be removed if you want to use an unmodified barrel. (or want to find the optimum rotation for a barrel before notching its collar). Additionally, when the pin is removed, you cannot see the hole in the receiver nose unless you remove the barrel and examine the very front of the receiver. If you want to later completely restore the receiver’s appearance, you can tap in a 0.001” oversize pin and top it with a small plug weld that you then dress down to blend with the rest of the receiver nose. What is the downside to this system? You need to be careful setting up, drilling, and reaming the hole in the receiver nose. The wall of the receiver nose where you will be drilling and reaming the hole is only about 0.143” thick. That leaves not quite 0.025” material on either side of the finished hole. If the hole is not properly located, or is drilled at an angle, or wanders while you are drilling it, you could end up breaking through the wall of the receiver nose. On the other hand, this approach does not require any welding on either the receiver or the barrel. I assume most barrels will be made from 4140, which can be finicky to weld. As far as the front trunnion goes, I see that they were welded to the receiver tube during manufacture, but I have no idea what steel was used or what welding procedures would be required. Thoughts or comments?

https://www.ebay.com/itm/397270972823?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5339137922&toolid=20006&customid=1e600fa68d271277be3165ffe9b28ac2|null|null&gclid=1e600fa68d271277be3165ffe9b28ac2&loc_interest_ms=44813 "US M1917" swivels? Are they different from British Enfield swivels? ...Phil

Not anymore!😂

Hello everyone, What can anyone tell me about DETONICS SCOREMASTER pistols in .45 ACP out of the PENDERGRASS Georgia facility that is MATTE STainless and has a factory Picatinny rail for accessories? How many were made? Etc. I have one in excellent condition and I am searching for an original SCOREMASTER magazine for it. If anyone has any info on this handgun please share Thank you

Dan, The only original Colt's I have seen via pictures with what I call a Springfield type sling swivel are from the 500 Swedish Colt's sold by Auto-Ordnance in 1940. For those with The Ultimate Thompson Book, turn to page 293. I also suspect that the 951 Colt's ordered by the U.S. Army on June 30, 1939, were also equipped with the Springfield type sling swivels. These are the Colt's with the following markings: U.S. Model of 1928 A1. The original number 1 has been overstamped with an 8, but the added U.S. and A1 markings are in a uniform straight line. Unfortunately, none of this variation have been found in original condition. See Thompson: Colt's, West Hurley's & More on page37 for more information. When the 1928A1 nomenclature was adopted by the U.S. Military in late 1930, I would guess some of the Colt's in inventory, mostly with the USMC, were marked with the "new" U.S. and A1 markings. However, I do not believe these added markings would be as uniform as found on the 951 Colt's ordered on June 30, 1939. The configuration of these Colt's could be anything as they progressed through military service. Those with The Thompson Encyclopedia series should also have this information.

That Skip... he's loaded!

Jim, I had two solid billet recoil spring guides (single piece) made for me. They are solid with zero chance of ever being damaged. I'll post photos of them today or tomorrow.

For sure the M1928N made by AO/Colt probably did. BUT, A large number of M1921/28 were converted by the military and we really don't know how they were out fitted. Tracie Hill

Deerslayer, The butt stock on the early 1928 Navy Thompson’s also had the Enfield type off-set swivel. The base is smaller than the Springfield type swivel, so you will have to find an AOC modified stock. WWII stock will not work.

I know the "navy" horizontal front grip had the offset sling swivel, but would the buttstock have the same. Or is the standard milled swivel correct to make a matching set of wood?

The thread pitch for barrel to receiver is the same between Kahr, WH & G.I. barrels. As far as I know, the difference between Kahr & GI barrels is the fin count and chamber fit. Semi-autos are known to have tighter chambers. I could be wrong. Dan please chime in. Karl

Very nice, when are you going to let me shoot it? 😁

I bought one and the bolt and recoil assembly are in excellent condition. I do have a question, though...are the FBP parts straight 'drop-ins' and/or should there be concerns with headspace, etc.? Skip

If you are going to have deerslayer perform the work, ask Dan whose barrel you should get.

I've been happy with the IMA barrels, solid quality. I also do Thompson work, based out of SE Michigan if you ever need work done.

I have an IMA barrel as well so I'd also like to know what the issue is with those barrels and the current Kahr 1927s. Does anyone have an answer to the OPs question?

That's the Larry, Moe and Curly technique. It only works in areas where you cannot see in which direction your assailant are coming from.