Welcome to the Forum Johann!
The London view mark and the wording “New Barrels fitted by..” suggests that Adkins was not the original maker, but that it came from a London gunmaker and that the barrels needed replacing.
Perhaps other Forum makers will be able to recognise the likely original maker.
There is sometimes a lock makers name stamped on the inside of the lockplates, but specialist lock makers like Brazier, Chilton and Stanton made locks for many different gunmakers.
Thank you ! It is competent advice, hopefully more turn up
