Lennyjoe
Member
whats the best brand for the buck for an AR 15 magazine in .450 Bushmaster?
Sage advice, worth repeating. Until somebody makes a magazine with proper single-stack feed lips instead of stuffing a different follower into a 5.56-style double stack mag body, this is gonna be imperative.No matter what magazine you use it's a good idea to make sure you de-burr and polish the edges of the feed lips smooth. The center feed of the big bore cartridges makes them sensitive to sharp feed lips.
I’ve also tried P Mags with the same results as you. Also tried ASC stainless, but the lips are wide requiring quite a bit of bending to make them work. Lancer 10 round mags hold 4 rounds of 450, I use those for hunting.I do the same cut to the front of my conversion too 303 hunter. Keep the brass from getting scratched up as much when loading the magazines.
I tried converting a 10rd PMAG (its easy to remove the front rib in the short magazine body) to become a 450 Bushmaster magazine. It works, holds four rounds, but the magazine is not stiff enough and the feed-lips spreads when loaded making it hard to insert and it will not drop free until empty.
View attachment 846087
Left to Right: Converted PMAG (4rd), Odd balls (5rd)*, Converted NHMTG 20rd (7rd), Bushmaster Factory Magazines (5rd).
*buddy gave them to me. They have DPMS floor plates and machined Delrin followers. Do to how short they are I really like them for hunting.