Originally Posted by Comeau-SCS
Anyway it is better to calculate with the weight used as Thundercactus said. Also having double polish bb is crucial because i've seen difference between different BB.
Agreed, BB bastards tend to gain 10fps over other brands
At JOC games they've been using tamper proof stickers to mark PTWs. Sticker goes on the receiver so you can't split it, or sticker goes right on the cylinder, not easily visible, but you can't take it off that cylinder.
More difficult with quick change springs
Polarstars you just zip tie the tournament regulator
GBBRs are much more difficult to keep track of since propane is sensitive to ambient temperature changes.