There is more real science displayed in the construction of a gun-lock than mechanics in general imagine. The placing or hanging of the swivel on the arm of a tumbler, is an arrangement of leverage partaking of the multiplicate; as the weight when at full cock, is lessened by the lever bringing the moving force in the immediate vicinity of the axle, and when down on the nipple, increasing or multiplying that force by the divergence. The Barside lock possesses this advantage to a greater degree than has yet been obtained by any backwork lock yet made; though I perceive no hindrance, if properly understood and tried: it is only needful to obtain a greater length of arm, and a proportionate length of swivel. The family of the Braziers, of Wolverhampton, have long been celebrated for the goodness of their locks; which arises solely from the fact that they take more pains, and will not manufacture any but the best: for it would be ridiculous to suppose that there are not plenty of men equally as good, and probably better, workmen than themselves in the kingdom, were they properly encouraged, and confined to making nothing but first-rate articles. The Braziers have apprentices and journeymen, and it is preposterous to imagine that they file the tenth part of the locks they furnish to the trade; but yet they have always, and deservedly, obtained a much better price than any other lock-filers out of London. Several of Brazier’s workmen have of late years commenced manufacturing on their own account, and now most excellent locks can be had from W. Evans, of Bath-street, Birmingham, who for many years held the first place in Joseph Brazier and Sons’ manufactory. The operations of false breeching, jointing locks, stocking, &c., are merely mechanical; requiring, certainly, great skill and ability, but yet involving no principle further than is contained in the proper suiting of the shape to the make of the user. An endless variety of opinions has always existed, and always will exist, as to the description of bend or crook best fitted for rapid shooting, as flying or running. I have instructed, and with success, too, many young shooters, who by commencing with a long and straight stock, have attained a perfection in shooting scarcely to be excelled; and they never entertain afterwards any wish to change either length or bend. Therefore I recommend to all beginners to use as long and as straight a stock as they can _conveniently_ bring to the shoulder. All practised shooters have generally so accustomed themselves to one shape, that it would be prejudicial to change. The practice of throwing off a stock at the butt, or bending from the hand to the heel-plate, in a direction to the right, so that the eye may get more readily in a line with the centre of the breech and the sight, is a practice not to be defended on scientific principles. The body will suit itself best; and if the stock be not too straight, the eye will always find the true line.