Be extremely cautious. Here are common traps:

The significance of Al-Mughni lies in its methodology. Ibn Qudamah did not merely compile the opinions of the Hanbali school; rather, he authored a comparative legal masterpiece. In each chapter, he begins by stating the dominant view within the Hanbali school, supporting it with evidence from the Quran and the Sunnah. He then proceeds to discuss differing opinions from other schools of thought, analyzing their proofs and offering rebuttals or concessions where appropriate. This approach makes the text invaluable not only for Hanbali students but for any researcher interested in the mechanics of ijtihad (legal reasoning) and the evidentiary basis of Islamic rulings.

While the full Al-Mughni is not available in a single PDF, there are legitimate, high-quality English resources that derive from it.