doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Internal view of bar action hammer locks.

This is from an 1885 L.C. Smith, much the same design as to sear spring, mainspring stirrup and bridle. A lot of work to make this lock.
To cut some costs in 1897, L.C. Smith did away with the block to hold the short leg of the mainspring and used a pin (screw post). This way the lock plate could be made the same thickness without having to mill away most of it to make the block.