L42A1 bolt head question

[Roger Payne]

I very much doubt that it would have been mandatory even for them to have gone out with a 0 bolt head on them at the time of conversion; they would have gone out with the bolt head that gave a correct fit for the various bolt fit parameters (lift, over travel, & so forth), & the correct head space.

When we hear from PL no doubt we will get the definitive.....!