Massage gun marketing leans heavily on speed (percussions per minute), but two less-advertised specs explain more about how a gun actually feels and performs on real muscle tissue.
Amplitude determines how deep the effect actually reaches
Amplitude is how far the gun's head physically travels with each stroke, typically measured in millimeters. A greater amplitude reaches deeper into muscle tissue with each percussion, generally considered more effective for larger muscle groups and deeper tissue work, while a shorter amplitude feels gentler and more surface-level, sometimes preferred for smaller muscles or more sensitive areas. Speed (percussions per minute) and amplitude are separate specs — a very fast gun with shallow amplitude produces a different, less penetrating sensation than a slower gun with greater amplitude, even though the faster number sounds more impressive on a spec sheet.
Stall force indicates real motor strength under pressure
Stall force measures how much pressure can be applied against the gun before its motor stalls out — a genuine indicator of motor strength and durability under real use, since applying firm pressure during actual use is common and expected. A gun with a low stall force may bog down or stop functioning properly under moderate pressure, which is a real, practical limitation that speed and amplitude specs alone don't reveal.
Attachment heads serve genuinely different purposes
Different attachment head shapes are designed for different body areas and effects — a rounded head for large muscle groups, a smaller bullet-shaped head for more precise, targeted pressure on trigger points, a flatter head for broader areas. This isn't purely cosmetic variety; using an appropriately shaped head for the specific area and purpose meaningfully affects both comfort and effectiveness compared to using one generic head shape for every application.
Noise level varies a lot between models at similar price points
Massage gun noise output varies significantly between models, and quieter operation generally requires better internal engineering rather than simply being a byproduct of price alone. For use around others, during video calls, or late at night, checking a specific model's actual noise level in decibels or in reviews is worth doing, since two similarly priced guns can differ noticeably in how disruptive they are during use.
The one thing people forget
Avoid using a massage gun directly on bones, joints, the front of the neck, or areas with acute injury, inflammation, or unexplained pain — direct percussion on these areas isn't just less effective, it can cause real discomfort or aggravate an existing issue. Massage guns are generally intended for use on larger muscle groups, and following basic usage guidance about which areas to avoid matters more for safety than any spec difference between guns.