DEER GRUNT CALL WITH FLEX TUBE & REALISTIC TONES -
Here's a popular deer grunt insert that is fully adjustable plus the Flex Tube also offers the ability to direct the sound and to change the tone.
You'll need a barrel that's at least 3.5" long and you'll drill a 5/8" bore and a 27/32" bore. Many thousands of this exact style of Deer Grunt Insert have been sold and are used each year during the deer hunting seasons.
LISTING: ONE DEER GRUNT INSERT WITH FLEX TUBE