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Revolvers are not taken apart except for repair. Suggest you find a gunsmith. Instructions far too lengthy for a Wiki Answer.
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Best left to a gunsmith
To take apart the Gecado .25 caliber rifle, you will begin by making sure that the rifle is not loaded. Remove the retaining pin at the base of the barrel and remove the barrel.
Contact S&W for a manual or download one from their site or ask a gunsmith for help
There is no ONE .25 caliber pistol, therefore no ONE set of instructions. Contact the maker of your gun, get the owner's manual, follow directions for YOUR gun.
J.P. Sauer & Sons of Eckernforde, Germany made all, to my knowledge, of the various firearms imported and sold by Hawes Firearm Co. of Van Nuys, Ca. I believe that Hawes Firearms was in and out of business in the 1960,s. I, by the way, have a couple of their single action revolvers and find them to be very good guns. My belief is that they are probably about as strong as a Ruger. J.P. Sauer & Sons only made cartridge firearms. The Hawes Firearms replica black powder percussion revolvers were made in Italy by Arimi San Paolo, Rigarmi, and another unknown Italian manufacturer using COM marking. Some were marked just "Made in Italy" along with the Hawes Firearms markings. Dr. Jim L. Davis
Roughly .275 or .28 caliber. Take MM divided by 25.4 (mm/inch) and you get caliber in hundredths of an inch.
30-06. It HAS to be a 30-06, it wont take a 30/30 or an ordinary 30 caliber.
Contact S&W and ask for a owner's manual. You can also download one from their website or ask a gunsmith for help.
Take You Apart was created in 2003.
about .309 caliber, which is roughly .31 caliber. Assuming that you meant 7.85 millimeter. Since there are 25.4mm / inch, you take 7.85 divided by 25.4 to get caliber (in hundredth of an inch).