What the thread found

• Precise arm post diameters are 0.740 inch and 0.492 inch, not the nominal 3/4 and 7/16 inch.
• Maximum safe post length depends on material, cross-section, load weight, and operating mode: walking, running, or vehicle-mounted.
• One experienced instructor's rule of thumb: post length should not exceed approximately 7 inches under typical working conditions.
• The proposed configuration uses 2024-series aluminum, carries approximately 25–30 lb, and is intended for running or slow hard-mount vehicle shots.

Depends on

• Structural limits vary with aluminum grade, post diameter, and bracket geometry.
• Safe length depends on load mass and dynamic stresses from walking, running, or vehicle motion.
• Actual tolerance stack-up requires direct measurement of the specific G50X arm posts and bracket bore.

Parts

Hard Mount, Low Mode, Arm Post

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