I can't believe I used other magazines for my Carbine before this one. It fits my M4 amazingly well. There's no wobble in the magwell that would make me nervous during a game--everything is snug.
The ridges are aesthetically pleasing for an M4, kinda dresses things up a little. It winds great, and I've never had any feeding issues with mine (as with most mags, wind till it clicks). Don't let price deter you, this is a quality magazine that fits great.
- fits very snug (I can only attest for M4/M16 platforms specifically)
- ridges are ergonomic and aesthetically pleasing
- 450 bbs, 450 kills right guys and gals?
- winds and feeds great
(Do yourself a favor though, seriously...)