Caliburn upgrade to use OD: 40mm ID: 36mm (metric) aluminium plunger tube including the new takedown magwell design

thingiverse

CHANGE NOTE 01/18/19 - Updated the thing to the latest version 3.5 of Caliburn using the new MilanCoupler, which holds up much better with the enlarged connection to EliteUpper. Also included a ramrod base as requested. However, I didn't test this part, so be aware to test it yourself. CHANGE NOTE 10/28/18 - Added MilanCouplerC with an ID of 40mm. The default MilanCoupler keeps breaking after some period of use. CHANGE NOTE 09/03/18 - Updated to enable using a 40/36mm tube in the new takedown magwell design of Caliburn by Captain Slug. I used M5 thread pins for the magwell pins. It's recommended to print the MilanCoupler at 100% infill. ORIGINAL SUMMARY I created the Caliburn blaster for myself and my son, but couldn't find a suitable tube diameter. Therefore, I modified the included parts to fit a tube with an outer diameter of 40mm and an inner diameter of 36mm. The o-ring used for a tight seal with the tube is a ring of 29.4x3.1mm with a hardness of 70 shore. This design is very nice!