*SOLD*
4 SIG 20 round polymer magazines. These have been modified with a small half-moon cut to accommodate .450 BM rounds. Everything else is stock.
These are by far the best I have used. The feed lips and feed angle are about as close to perfect as you could hope for in a magazine not expressly designed and built for the .450 BM round.
I have not loaded more than 5 rounds of .450 BM in these, so I'm not entirely certain how many rounds you could stuff in there... I do know they have functioned flawlessly in three different rifles when loaded with five rounds.
Looking for $70 shipped and paypal'd in the lower 48 for all 4 magazines.
Email wittwil@hotmail.com.