I've been following some of the posts on various sites about modifications. As previously stated, the smokeless guys are doing a lot of experimenting(as are bp shooters). It seems to me that a larger flame channel and a vent liner are about all that would be needed to prolong the BP life indeffinately. Blowback seems to be virtually non-existant on a lot of the newer models(breech area). It seems that convenience is King in todays market.