Blazer Barrel Diameter Markings

[Giuseppe]

Can anyone tell me how the barrel diameters are marked on Blazer barrels? I know they use one, two, or zero rings to indicate the diameter, but I can't remember which is which... 🤔

[Mjlynnjr]

I just received a brand new blazer from Palmer’s and had ordered a 0.685 barrel bore. My new barrel is marked with two rings. If I remember right a barrel with no rings on it is a 0.690, two rings is 0.685, and a three ring barrel is a 0.680.

[Giuseppe]

Thanks, Mjlynnjr.

Just for posterity, Palmer's confirmed that it's:

.680 = 1 ring (or 3 rings!)
.685 = 2 rings
.690 = 0 rings

Bonus tech tip: if your detents are loose, you can use a small amount of blue Loctite or clear 5-minute epoxy on the threads.

[Funsi00]

.680 = 3 rings, .685 = 2 rings , .690 = no rings