This guide, based on insights from Ian McCollum of Forgotten Weapons, explains the fundamental factors determining a machine gun's rate of fire. It details how bolt travel distance, bolt velocity, and bolt mass in blowback systems directly influence cycling speed. The information is presented for advanced users interested in firearm mechanics and modification principles.
This video explains the necessity of heavier buffers in pistol caliber AR-15s compared to standard carbine buffers. The increased weight is crucial for blowback-operated systems to slow the bolt's rearward travel, preventing premature ejection and potential malfunctions. The video also touches on how buffer length can be adjusted for specific calibers and reduced bolt travel.
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