Hello to all! As I have never even touched a nice Luger carbine, I probably have the smallest dog in this fight... but, I have conversed on this subject as some length with Mr. John V. Martz who has a lot of practical experience on this subject... I know that his earliest carbine efforts were dead ringers for the original 1902 type carbines. This included the assist spring in the forearm, and similar mass in the barrel / receiver ass'y. and they (Johns)were made in 9mm, and I believe .30 cal as well, old and new style toggle ass'y's... they functioned great! I also am aware that in latter examples, he deleted the assist spring in the forearm and they still functioned great... I do not know what he used as a main spring though, as he has converted many of the flat spring frames over to coil.... Gott'a shoot'em to know'em! Give John a call and get his take on it... Best to all, til....lat'r.....GT
