Can someone tell me the size of the gas port that COLT uses on their 5.56mm, 1/7 twist barrels for the following models:

20" M16A2
14.5" M4
11.5" Commando

Thanks

Mmm heres what I have saved..
Tate originally posted this..

11.5" barrel, .625: dia., 3.850" from muzzle;
Port sizes from .081" to .089"
11.5" barrel, .750" dia., 3.850" from muzzle
Port sizes from .086" to .094"

14" barrel, .625" dia., 8.375" from muzzle;
Port sizes from .063" to .078"
14" barrel, .750 dia., 8.375" from muzzle;
Port sizes from .070" to .086"

16" barrel, .625" dia., 8.375" from muzzle;
Port sizes from .063" to 078"
16" barrel, .750" dia., 8.375" from muzzle;
Port sizes from .070" to .086"

20" barrel, .625" dia., 8.375" from muzzle;
Port sizes from .086" to .093"
20" barrel, .750" dia., 6.875" from muzzle;
Port sizes from .093" to .096"
24" barrel, .825" dia.,
Port size .089"


Info from Rick McDowell - Yahoo AR15 list


Rick McDowell NRA Life
Competition Specialties USPSA Life, Master
105 E. Cass, PO Box 451 641-342-2011
Osceola, Iowa 50213 800-369-4481

Excellent post! Thanks