I am now building two Carson Hawkens to be close copies of the original, except one will have a 1" barrel for weight reduction. Others here have said the barrel is 31 1/8" long ahead of the snail. To get the correct dimensions and parts, I secured Jim Gordon's permission to photo enlarge his Kit Carson rifle photo in his excellent book "Great Gunmakers for the Early American West, Volume III".
I took his book to a printing shop and they enlarged the full length photo to life size. Knowing my Jim Bridger copy was closely similar to the Carson rifle, I laid it on the photo and here is the result. Note that my barrel is only 31" long (The GRRW 1 1/8" I had to work with) instead of Bridger's 33 1/8". Thus I made my forend shorter and the keys are spaced differently from Bridgers, but are closely similar to Carson's, just by chance.
Length of pull is 13 1/4" for both.
Same butt plate for both, the Jim Bridger from Track of the Wolf. Needs filing out.
[img width=700pt height=351]https://img.photobucket.com/albums/v122/HerbGLT/KCBP_zpszzcmcfhp.jpg[/img]The locks are the same, the Jim Bridger by Davis, only about .050" shorter than the originals.
Trigger guard same for both, Track's LG-Hawk-L-I or Muzzleloader Builders Supply 14820. Some minor heating and bending is needed. Correct trigger is Ron Long by Track. Note the low blades, work as is. The front of the plate needs to be bent lower to match the stock. I always do this.
L&R trigger is different, but can be made to work with shortening the triggers. Note the higher blades. This is MBS trigger guard, which has an unthreaded 5/16" stud for fastening into the trigger plate. You have to cut the threads, and also recut Track's 1/4" stud threads.
Correct entry pipe is filed from Track's, with the barrel cut shorter for Carson to 2.7" length. Bridger's is 2.75".
Nose cap is best made of a casting rather than the Ted Cash. Track's looks to be .5 inch long, but MBS is .8" long, correct, and made for 1 1/8" or 1". which can be filed open for a tapered barrel.
My Bridger compared to Track's full size plan of their "Kit Carson Hawken".
There is no correct inletted stock for the Carson as far as I know, but I think Knob Mountain has one very close, with a 13 1/4" LOP and a 3" drop at heel. I had Carl Walker of the old GRRW bandsaw their Hawken pattern out of my blanks, route the 1 1/8" tapered barrel and saw the 1" straight barrel inlet for the other and drill the 7/16" ramrod holes. I have to whittle away what isn't needed.