004" on most Ruger Double Action Revolvers, other manufacturers clearances may vary. The difference between the two numbers is the amount of movement or Endshake your cylinder has, it should be between. There may be no clearance here at all, the cylinder may touch. Next, hold the cylinder forward and re-check the gap, write it down. To check B-C gap, hold the cylinder rearward and insert the (thickest that will fit) feeler between the Barrel and the Cylinder, this is your Barrel-Cylinder Gap, write it down, it should be between. K-D Tools USA Made # 161 Deluxe Feeler Gauge is available all over the internet and at most good auto parts stores for under $10 In order to properly measure these clearances you will need a Feeler Gauge Set. The Front-To-Back Movement of the Cylinder is the Endshake. The gap between the back of the barrel and the front of the cylinder is known as the Barrel-Cylinder (B-C) gap. TECH TIP: ENDSHAKE Barrel-Cylinder Gap and Endshake
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