_The Roper Four-shooting Shot-gun and Rifle. (Made by the Billings & Spencer Co., Hartford, Conn.)_—A, frame; B, receiver; B¹, hinged lid of receiver; C, hammer; D, plunger; D¹, head of plunger; E, plunger link; F, cartridges; G, carrier in which shells are placed; H, lever to revolve carrier; I, mainspring; J, sear; _a_, ratchet; _b_, stirrup; _c_, link connecting hammer with mainspring; _d_, pin of lever H; _e_, pivot of carrier G; _f_, firing pin; _h_, elastic tail of lever H. To take apart: To take the gun apart, _turn in_ the set screw on under side of cylinder forward of the guard plate screw, until it comes to a stop. Then bring the hammer to cock notch and unscrew the cylinder from breech. N. B.—This set screw turns _in_ to take the gun apart, and turns _out_ to fasten the cylinder. In putting the gun together, screw up the breech until the set screw can be replaced. This screw should be turned sufficiently tight to prevent any looseness of the breech. To take off the stock and expose the lock, take out the long screw that runs through the small, rear end of receiver on top, and the screw in the guard plate which fastens it to the receiver underneath in front. Then remove the stock, and the working parts are exposed and can be readily cleaned and oiled. The firing pin should be detached occasionally, cleaned and oiled, as its easy working insures certain fire. To do this, take out the small screw in the top of the hammer and remove the piston entirely from the receiver, and the piston and firing pin are readily separated. In replacing the piston, care should be taken to put it in right side up, the retractor spring being at the bottom. Never attempt to take out the screw which fastens the link to the piston, until the firing pin is detached. _Colt’s Revolver For Army Use, Cal. 45.—(Made by the Colt Pat. Fire Arms Co., Hartford, Conn.)_—A, barrel; B, Frame; B¹, recoil plate, C, cylinder; DD, firing pan; D¹, center pin bushing; E, guard; F, back strap; G, hammer; H, main spring; I, hammer roll and rivet; J, hammer screw; K, hammer cam; L, hand and hand spring; M, bolt and screw; N, trigger and screw; O, hammer notches. P, firing pin and rivet; Q, ejector rod and spring; Q¹, ejector tube; R, ejector head; S, ejector tube screw; T, short guard screw; U, seat and bolt spring (combined) and screw. V, back strap screw; W, main spring screw; X, front sight; Y, center pin catch screw.