Will I make gains even if I do not always go full range of motion?
Yes, but those gains will be improved if you use full ROM.
Partial reps, for example, have been used by many body builders in the past, as a way of increasing strength and power, and stimulating the muscle differently.
However, these were only used OCCASIONALLY. It was simply a way of shocking the muscle to promote growth.
You can still get big and strong by doing reps without full ROM, but you will be training your muscles in a way that can lead to injuries if they are ever forced to go beyond your training limits.
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