Originally Posted by mcguyver
The BBBMax is not PTW friendly. They are widely known to misfeed, and will destroy the nozzle and sometimes the chamber. This requires a replacement cylinder head and chamber at a cost of about $150 at a minimum.
The effect is noted to be worse during colder or humid weather, as water vapur increases the surface tension on thses BBs, and in a double-stack situation (as PTW mags are) with BBs rolling pat each other, misfeeds are worse.
The Bioval are not recommended for PTWs, and if the Bastards ones are the same, I would say the same for them.
If you fire semi-auto, slow single shot where mag feeding is not an issue, eother may be fine (but still iffy). The problem was noted primarily in full auto, and users with problems spanned the globe.
This is the key reason why Biovals differ from standard Clears. Standard clears are not ideal for PTW for the very reason that they cause a great deal of friction, since "glass" like materials have a bonding characteristic to them.
The finishing process on BBBmax is much much smoother and offers considerably less friction. Smaller diameter provides less surface area for friction to occur and eliminates misfeeds. This is where the secondary finishing process takes place in Switzerland, which sets these bb's apart from the generic .28 clears found everywhere.
BBBmax are in fact designed to handle PTW's, and is why U.S military use the MAX for their PTW training. This is clearly a case of generic .28 with standard surface finish and larger diameter being mistaken for MAX.
European companies like Begadi, can't get rid of their glass bb's quick enough for this very reason. They've converted to BBBmax as their primary clear round.
It's a process as I've said in the past. People will figure out what works best.