Dear Peter, IF you ever have any spare time, check out this website. Fun projects by many a talented individual, including Mighty Lime and his award winning Bren build.
http://www.weaponsguild.com
No worries on no input. I understand exactly why there as there was simply no experience in this area. But I always appreciate your oversight and insight. I am guessing that there were no mag issues once the L4 were fielded. My problem seems to originate internally in the gun. At least that is what I believe now.