I bought two different TC Hawken flintlock rifles new in the box from big box online sellers, both came from the factory with the touch hole placed in the back corner of the pan. I sent one back to TC because of this misalignment, they sent it back to me and said they didn't see a problem with touch hole placement and the gun fired just fine. I bought these guns after TC's quality had gone down a good bit, the last one I bought had the lock held at the proper depth in the inlet with hot melt glue.
On the above-mentioned L&R lock swap I had to move the barrel back to align the touch hole to the sunset position. If your touch hole is off you do have a little wiggle room on a factory gun to move the barrel back but not forward. I had to cut about 1/4" off the rear of the under-rib to move my barrel back, the wedge pin clevis on the barrel is oversized and lets you go back a little.