A gun shop.
slightly under .25 or a quarter inch. the well-known .22 caliber is 5.56 MM. the memory jog for me is my birth year- l956. The Japanese service rifle of 6.5MM was rated as ( .25 caliber) by Rifleman and other Gun periodicals. nice question.
22 long rifle
Repost your question giving the MAKE of the rifle, we may be able to answer. Several companies used Model 6.
Under Hitman do the Disrupt Rival smuggling ring job to get a .50 Caliber rifle. It takes 5-6 times to get the rifle. so you may need to get energy pack or wait until you are full on energy again
6-24 magnification, 50 mm lens
January 6 1902-43,897 were made
The best for what? Paintball, .177 Pellet, 6 mm pellet or bb rifle?
That is '6.35mm' or .25 auto. Value depends on condition.
100-500 USD depending on condition, accessories, box, manual, etc..
Browning made the "Baby Browning" in Belgium for several years, on the muzzel of this tiny 6 shot automatic it states .6mm. It does in fact take 25 caliber ammunition.
Try looking on the butt or crane.
Gun shop, old gun catalogs, blue book of gun values.