Semi-auto Bren new built receivers?

[Peter Laidler]

Just as a little aside to this thread where someone suggested that firing from an open bolt keeps the barrel and receiver cooler. Well............ It
n THEORY and in the most very marginal test lab practice this may well be true. But in real practice, the open bolt v closed bolt operation with respect to barrel cooling has no effect at all. The tubular barrel, while being open at each end during lulls in firing has no real effect on cooling the barrel. Of course it has some effect...., it must but only measurable using instruments

This scenario has been used as a student discusssion and classroom practice for years and years and while it's good academic stuff, there is no mileage in complicating a weapon mechanism to incorporate it - as was shown time and time again with the UK SA80 machine gun and rifle variants. To prevent cook offs, then yes. But even then, the time between cook offs diminishes as the barrel cools and even the cook offs don't re-heat the barrel sufficient............. anyway....., you get my drift!