want to know the correct size of scale aircraft gun barrel...here you go

Info August 7 2016 at 5:38 AM		Andrew Deeley   (Login deeley) HyperScale Forums from IP address 86.189.128.252
Response to Help Wanted: scale tubing measurements for guns?
Hi I did as search on HS under - gun barrel metal tubing chart. The below came up. Suggest you do a similar search as it had much more info and tips than I can post Andrew Ps sorry for no credits. I'm using an iPad and copy paste is a pain. This came Here is a chart... February 17 2007, 12:27 PM that some posted on the FSM forum some time back. The parts numbers correspond to tubing found athttp://www.smallparts.com/CatagoryGUI.cfm Scale Gun Barrel Chart For Hypodermic Tubing 1/72 Scale Caliber I.D. Gauge+ Part # - 304* Part # - 316* .30 cal.** .00416" 33 HTX-33R N/A .50 cal.*** .00694" 28 HTX-28R HTXX-28R 20 mm .01090" 25 HTX-25R HTXX-25R 25 mm .01310" 23 HTX-23R HTXX-23R 30 mm .01640" 22 HTX-22R HTXX-22R 1/48 Scale .30 cal.** .00625" 30 HTX-30R HTXX-30R .50 cal.*** .01040" 25 HTX-25R HTXX-25R 20 mm .01640" 22 HTX-22R HTXX-22R 25 mm .02050" 21 HTX-21R HTXX-21R 30 mm .02460" 20 HTX-20R HTXX-20R 1/35 Scale .30 cal.** .00857" 27 HTX-27R HTXX-27R .50 cal.*** .01430" 24 HTX-24T HTXX-24T 20 mm .02250" 20 HTX-20R HTXX-20R 25 mm .02810" 19 HTX-19R HTXX-19R 30 mm .03370" 18 HTX-18R HTXX-18R + the gauge has been rounded out to the closest available from www.smallparts.com * these are the two (2) different grades of hypodermic tubing can be used for 303 British, .30 Browning, 7.62x39mm, 7.62x51mm and 7.7 Jap or Arisaka *** can be used for .50 Browning or 12.7mm Russian