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Lyman GPR Flint Kit

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mykeal

58 Cal.
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Took delivery of my winter project a few days ago: a .54 cal Lyman Great Plains Rifle with a flintlock ignition system. I plan on documenting the major steps and publishing my progress on this forum.

I'm in the process of fit checking all the parts at present. So far only two problems identified (more on those later).

The kit came partially assembled; that is, the lock, butt plate, heel plate, nose cap, ramrod entry guide and trigger assembly were all installed in the wood; the butt and heel plates and the lock were screwed in place, the nose cap and ramrod entry guide were pinned in place (with small pins that I frankly failed to notice for a good half hour while I struggled to get those parts off the stock). Small parts were enclosed in a ziplock plastic bag.

This kit is not a "bag of parts" by any means. Inletting appears to be completely done. Very little, if any, shaping needs to be done on the stock external lines. There are a couple of spots that need to be "ground down" to the contours of the metal parts, but not much. There is one place where the metal is proud of the wood contour (more later). With that one exception I'm very pleased with the fit of the metal parts on the stock, as well as the general condition of the stock and metal parts.

Regarding draw filing the barrel: there is quite a bit of stamped lettering on the barrel. I know some people draw file this information off, but it doesn't bother me, so I think all I'm going to have to do is polish the metal with some steel wool. The trigger guard does have some surface rust but no pitting.

I plan on either cold browning with the Laurel Mountain chemicals or doing a hot brown with Birchwood Casey's Plum Brown. I've used both and am on the fence at this point as to which I'll choose.

I was frankly surprised with the stock being a nice piece of walnut. I had planned a fairly red stain but I'm rethinking that. I may get a piece of walnut from the local sawmill and try out some different finishes before I make up my mind.

To start off, I'm generally quite pleased with the quality of the parts and the kit iself. The wood is (at least appears to be) a fine grade of dark walnut:
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The barrel fits very nicely, tight but not difficult to install/remove. Here's the touch hole alignment with the lock:
3121.jpg


The flint appears to need no serious adjustment, although I'm still learning about this subject (this is my first flintlock). Here's the result of a couple of tests:
3020.jpg


Paul V. - here's the flint against the frizzen with the frizzen in the closed position. Is the angle you talk about measure between the front face of the frizzen and the top of the flint in this view? Do you have any comments about the geometry of this installation?
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Things I don't like:

1) the wedges fit too loose. I'm going to have to "adjust" the brackets the wedges fit into to tighten them up.

2) the tang is proud of the stock and will need to be draw filed down a bit:
3140.jpg


3) The hole in the stock for the tang screw is just slightly out of alignment with the hole in the tang, enough so that the screw won't pass through enough to reach the nut. In fact, I can't get it past the tang.
3124.jpg


4) The general fit of the tang in the stock is not as good as the rest of the metal parts. It fits tight, but looks like there's room between the tang and the wood. I couldn't get a good picture of this; the flash negates the effect. This may turn out to be an illusion.
 
I built one a year ago. It was a fun and relatively easy project. The worst part was the escutcheon screws. If you lube the screw threads with wax or soap you should be able to get them in easily. I broke one off but luckily my kit had extras.
The location of the touch hole on yours is exactly where mine is. It's not the ideal location in my opinion. I think you can work on the inletting a bit to get it to sit better. I don't have ignition problems but it still looks like it could be placed better.
Good luck with yours and keep up posted on your progress.

HD
 
Thanks for sharing. I look forward to hear of your progress. I bought a Traditions Trapper and it did not piece together well at all. Its a good learning process though. I'd like to get the same kit you have within the next year.
 
The kit came partially assembled..

That is some kit! My percussion .50 GPR kit surely didn't come "parts attached". I spent several hours getting the butt plate just right.

My GPR wood was also quite nice, in my opinion. You should just wipe it with a damp rag to get a idea of what it would look like with just an oil finish, no stain. Mine definitely would have been too dark with any stain.
 
This is why I love this site. I'm at the same exact point in my build of the exact gun. I've built a GPR cap kit, but this is my first flinter so your posting is going to be a great help. I just received mine last nite. An hour ago I cut a half inch off the butt, because I have a short reach, plus our muzzleloader season is during cold weather so losts of clothes. Hard to do because they also had the butt plate fit almost perfect. Said a couple of prayers and just did it, now I'm in the process rasping it to fit. Hope it won't look to funny. Haven't checked the tang screw fit yet, it's been an issue before. I'll be closly watching your posts.
 
I am working on a GPR .54 percussion. I have the exact same problem with the tang being a little proud and the tang screw hole not quite lining up. My tang screw won't fit through the hole either. I need to take some inletting black and see where the wood needs to be relieved to allow the barrel to set just a little further back. I only need to go about .050" further back. I also found the tang screw nut threads were buggered from the factory. I removed the nut and cleaned up the threads with a 10x32 tap. I will probably have to draw file the tang a little to get it down to the wood. Mine has very nice walnut too.
 
I am just about finished with my 50 cal GPR Percussion kit. I ran into the same issues with the tang and threads. I had to draw file a bit and I had to remove some wood in the tang channel to get it to bed properly. It still sits just a wee bit proud of the stock as it approaches the barrel. I also had to chase the threads in the nut. Once I inletted for the tang the rear screw hole lined up properly.

I did draw file the enraving off of the barrel. Not difficult to do. I ended up removing .003 inches from the 3 top flats to get rid of it all.

My walnut is also a fairly nice piece of wood.

Supposed to be a bit snowy tomorrow so maybe I can find some time to finish her up and get a few rounds put down the tube.
 
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