Jay;
Thanks for the illustrations. as can be seen in fig 4 the lump is a solid & separate piece in the dovetail lump. In fig's 7 & 8 are the two types of chopper lump barrels. The seam down the center is obvious in these. The chopper lump barrels thus, whether dovetailed or not, are the ones which could give problems with welding. I believe that when Winchester designed the model 21 they [laced the dovetail farther forward so it was necessary to increase the breeches as much as BSA did. According to Burrard this was a major complaint with the BSA in that it had very wide spaced barrels due to the dovetail.
