"I have a HFC HG175x which has a sig sauer P226 design which I love.but after won drop from 3 feet off the ground the left lip on the magazine broke. This magazine is also compatible with the Cybergun sig P226 GBB as well as the KJW p226! It is very heavy!!! Heavier than a real magazine filled with 9mm ammo, which is awesome. But my sig GBB is having a problem! Every time after I shoot it once I have to push the trigger forward then I can pull it. I hate that....... also this magazine doesn't hold gas very well so be careful, although most people say it does."