1, ordinary wear out: it's nomal just like any mechanical equipment has. In this case, lubrication must be necessary and helpful. If relevant parts have ample hardness and strength, such as using steel and quenching process, wearing process should be improved effectively. But this M93r is a toy after all, so it's impossible. Normally, adequate lubrication should be good enough.
2, accidental damage: when setting to full auto(or 3burst) mode, if the selector is not FULLY in place, that cause the relative inner parts have not TOTALLY be engaged each other. So when shooting, strong and continuous force will damage the relevant part(s) and cause the function failure. I guess this reason maybe accounts for a large portion of accidentical damage.
If so, two methods should be helpful to prevent M93r typical firing breakdown:
1, cleaning and lubricating timely
2, make sure the selector is totally in place, especailly the full auto mode
That's my personal idea about it!
3, because of part manufacturing (such as machining, precision casting and punching)tolerance, interference fit or burr between relevant parts will also cause the weakest part broken.
If so, when receiving a brand new gun, do not fire it eagerly in 3burst and full auto with no amply lubricating . Because all relevant parts are at the begining of meshing and wearing(even interference fit a bit), firing or over-firing in 3burst or full auto will cause this kind of problem directly.
Is it true?
Edited by Billy1788, 29 June 2012 - 07:44 AM.