Hold your receiver securely in the vise without
damage. Precisioin machined in the USA
from a solid block of high density polymer gives it a good snug fit. In addition to being a very
durable tool it will not scratch your receiver. You can hold a "bare"
receiver because it has a machined workstop on the side. Just
snap the vise block in like you would a magazine and its good to go. Our hammer fall test block is held in place by the forward takedown pin. Hammer can be safely tested without damaging the lower.