Acme 535 Silent Dog Whistle - Adjustable Ultrasonic brand_-Sierra the Burma Pro MFS rewards

the Burma Pro MFS rewards proper care with years of reliable service

while the boat-tail base steadies the bullet through its flight

It accommodates shotguns with barrels up to 32 inches

so every primer seats to the same depth and the firing pin strikes it the same way each time

Acme 535 Silent Dog Whistle - Adjustable Ultrasonic brand_-Sierra the Burma Pro MFS rewardsThe Acme 535 is the original ultrasonic gundog training whistle, made in Birmingham by J. Hudson & Co, the firm that invented the silent dog whistle. A screw piston mechanism lets you adjust it across a single variable frequency between 5,200 and 12,800Hz, so you can tune the pitch to suit your own dog and lock in a consistent recall note. To the dog the sound is loud and clear, carrying up to 1. 5km, yet it sits largely above human hearing, which is