Spearhead machine tuner

Barrel tuner from Spearhead machine. 1/2 X 20 thread, black nitride coating. This is a nice piece, machined well.

Tried it and don't like how it changes the weight of the rifle. Was mounted an a 457 varmint (Not MTR).  I have a yo-dave striker Spring for the 457 if you want as well 10$ extra 

I work a rotational shift so may have to wait for me to be home for shipping(Split cost). Or can deliver around Alberta as I travel for work.