Very well built, and a damn good design. Seats well in all my guns, wobbles a bit in some, but that never seems to affect feeding. Used in KWA SR12, Real Sword Type 97B, VFC Scar, TM M4A1, Classic Army M4A1, and Classic Army M249 without any failure to feed. A good deal in my opinion for about $10 a mag, they do what they're supposed to do and they aren't built upon planned obsolescence like the MAG brand ones.
-Nice external texture
-possible to disassemble and clean internally
-fantastic follower design
-could use more screws internally to hold the thing together
Rating: [5 of 5 Stars!]