M2 20Guage choke question

[LAME]

I need a turkey choke for my 20 guage M2. The tightest I can locate is a 0.570 by Primos.

Is this the tighest available and does it matter if it is not specifically for a Crio gun?

[tucker301]

The crio chokes are longer and fit deeper into the gun.

The choke itself doesn't have to be crio treated, but it must the right style for your gun.

 

Most of the makers are linked here.

http://www.wildturkeyzone.com/hunting/turkeychokes.htm

 

.570 is pretty tight.

[10Gauge]

Lame, i shoot a .575 Rhino from my M1 (20bore) and she patterns extremely well......like "tuck" said .570 is pretty tight! However, I'm sure somebody makes a tighter choke if you feel the need to go tighter.