2. Barrel with feeding groove, material is 38CrMoAl and nitrogen treated, surface hardness is HRC 65-68, which can has a long use life. 3. Millipore type mould with suitable inner compression ratio which can guarantee to produce high quality PPR pipes. 4. High automatic lev...
The biggest thing though is that if you’re trying to use it, or anything else, as a buried defensive bunker, you’d better have a hidden exit somewhere to get out if you’re found, and should be thinking about some serious camouflage around it for your entrance and vents. It would s...