Why Roller Delayed Operation is Very Sensitive to the Grains and pressure spikes of the Ammunition Gas Bleed Mechanics: ·        Bullet doesn’t perfectly seal bore; micro-gaps exist around driving bands/engagements. ·      Gas volume behind bullet grows as it travels; pressure equalizes forward via leaks at higher velocity differentials (Slower, heavy bullet). ·        Lighter bullet: Quick exit minimizes bleed time, steeper rear pressure curve, higher residual at muzzle (approx. 20 to 30 ksi). ·      Heavier bullet: Slow travel maximize bleed, flatter curve, lower residual (less than 10 ksi), more forward gas/ muzzle blast. Roller delayed blowback systems, like those in the HK G3 or MP5, rely on precise mechanical timing to delay the bot opening until chamber pressure drops to safe levels. Heavier projectile grains alter this timing, often requiring adjustments to maintain ...