A reader writes to say that he has a few hundred USGI M16 mags that he picked up for a song years ago. All are vintage with the old-style followers and springs which may or may not work reliably. He also has numbers of ComBloc surplus AK47 mags. He asks: "Do you know if the replacement of the USGI followers with MagPuls and Wolff springs (Approx. $2 each plus $5 each) is worth the extra money?" He also asks if anyone has experience with Wolff springs in AK47 mags? Again, is it worth the investment? Another reader and recipient of some smuggled USGI AR mags in Colorado asks a similar question. Since the acquisition cost for him is zero, $7.00 per mag sounds cheap to me IF the result is reliable. Anyone with experience in mag rebuilding have any guidance for these fellers? Further, I'm curious if there is any place that offers these products at a volume discount? In doing research for this post, all I could find for the followers was packs of three and packs of ten for the springs from Wolff.
Also, now that my curiosity was aroused by their questions and my cursory search on the subject, I wondered if anyone made a M16 feed lip inspection tool for civilian sale as described on pages 13-15 here and if anyone had experience with the Brownells AR15 magazine feed lip tool.