I actually had a BREN 10 in my hand but it was one of the ones without a magazine. I was tempted because we were assure the mags would be coming. There was a Miami Vice episode where Sonny changes mags and drops the empty. Rumor is/was that Bren 10 fans scoured the location for the magazine.
By todays standards the BREN is a dated design; but only dated like the 1911, Browning Hi Power, and Beretta 92 are dated. A simplified Bren is a viable option (minus features like the switch to SA only) and would make production easier (think CZ75), maybe add a decock option
Im open to 10mm but I think its only useful in the full power version, otherwise why not use 40SW (or 9mm). Glock seems like the EASY button for 10mm, and I do like Glocks but if Im going 10mm, I want a SA/DA (OK I really want a BREN). The closest Ive ever found is the steel version of the EAA Witness. For the life of me I cant figure why CZ hasnt introduced a 10mm in the 75 series. They make a 45acp version, so 10mm seems an easy option???
Id suggest the biggest negative to 10mm as a PD gun is the recoil. The FBI saw scores drop when switching from 357 to 10, making qualification difficult with "small statured agents" (read that as females) Likewise PDs saw scores drop when switching from 9mm to 40. We can blame that on recoil but Id suggest its more a factor of the personnel being hired (equal opportunity shouldnt mean decreasing standards to make less qualified...QUALIFIED)