I am just completing a Hawken using the Griffith lock that I purchased years ago from the Hawken Shop, ( I think that I purchased it at Friendship in 1996 or 2000 from the Hawken Shop's booth). It is slightly larger than my other favorite locks, and it was perfect for the larger Hawken that I am building. The quality seems OK, strong springs and slightly different geometry than Rollers or L & R, and it fit the rifle very well. The bolster area on the top of the plate is slightly narrower than I would have liked and when cutting out the relief area for the patent breech I had to weld a plate on the bottom to prevent the spring from breaking through. I haven't shot it yet so I don't know how well it will work out in the long term, but so far OK. Good luck with yours.
TW