From Midden-Sumatra. Reizen en onderzoekingen der Sumatra-expeditie, uitgerust door het Aardrijkskundig genootschap, 1877-1879, beschreven door de leden der expeditie, onder toezicht van Prof. P.J. Veth Volume 3.1.1:
The wooden stock has a berth for the barrel and inlets for the lock plate, the trigger plate, the trigger plate and the bracket crop. The butt is strongly curved, carved and ends in a pear-shaped face, covered with a copper plate. The barrel and stock are attached to each other by a single copper band. There is no ramrod, but the berth for it is provided in the stock. The lock, which, like the cock, bracket, trigger and trigger plate, is made of copper, consists of two parts, a front and rear lock plate. - The front lock plate (PI. XXIX fig. 1) contains the impact spring A, a slat, which rests against two plates B and B "standing on either side. The rear lock plate (PI. XXIX fig. 2) has a copper trigger spring C, which is riveted to the plate with a copper pin, and also a twice rectangular curved lever D, on which the trigger and trigger spring act and which rotates on a copper pin E attached to the strike plate. There are riveted pins B 'and F, which are provided with holes, and on the rear lock plate one such a pin G, which on one rifle is not pierced, on the other. They serve to attach the lock plates to the drawer. The holes of the pins correspond with openings in the drawer through which bamboo e-pins are inserted. The rear pin F of the front lock plate, when the lock is attached to the drawer, goes through a designated opening H in the rear. lock plate, which is partly behind the e first, and in such a way that the holes K correspond.
Between the two lock plates is the cock, which revolves around the copper pin (PI. XXIX fig. 4), which is inserted through the holes K, comes out on the other side of the drawer, and is closed there by means of a bamboo. e-pin, which is inserted into the hole L. When the cock (PI. XXX fig. 1), which has an incision M from the front, is stretched to the placement of the wick, the tail presses on the free end of the bamboo spring and tightens it. In a cocked position the cock rests under the short end N of the twice rectangularly curved lever D, which projects through a hole in the rear lock plate and is held in this position by the pressure of the trigger spring C. The trigger (PI. XXX fig. 3) revolves around a bamboo pin, inserted through the hole O, and when it is moved backwards, works with the notch P against the long end Q of the lever D (PI. XXIX fig. 2), whereby the short end N is retracted within the strike plate and the cock, having lost its support by relaxing the impact spring, is knocked down. The trigger plate (PI. XXIX fig. 3) has an opening R, through which the trigger goes, and is attached to the drawer by means of two copper pins S, which at the bracket crop (PI. XXX fig. 2) has space by a fixed copper pin T placed from behind and a loose U, which is inserted through a hole made from the front. All these copper parts of the rifle are decorated with elegant carving. For the fine herb on the pan, to ignite the charge, cloves, panggalah, neatly carved from buffalo horn, were used, which are closed either with a stopper (PI. XXVIII fig. 7) or with a spring in a peculiar way. (PI. XXVI fig. 13)

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