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are barrel tuners legal

The link works. It may take some time to download because it is almost 7 MB. The reason that I posted it is that sometimes shooters go to a match having not read the rule book, and are out of compliance with some rule or the other. I think that it is a good idea to have read all the rules for any match that you plan on shooting. For instance, in the case of tuners, there may be issues as to how they are adjusted. The devil is in the details.
 
Another short version:, Tuners must be adjusted from the seated position during a match and only with the bolt removed. Details be damned!
 
From page 18 of the IBS rules ...

a) Use of an attached barrel tuner shall be allowed, with the following restrictions:

(i) The tuner must be securely attached to the barrel (not made integral to the barrel).

(ii) The tuner cannot have venting ports.

(iii) The rifle must not exceed the weight as described herein.

(iv) Adjusting the tuner during a match can only be accomplished while remaining seated, and during a match can only be accomplished while remaining seated, and after removing the bolt from the action.

(v) The tuner is exempt from the barrel diameter restrictions (may be any diameter and length), but the barrel itself must remain within the dimensions as stated in the current rules. Failure to adhere to restriction #iv above will result in the immediate disqualification of the competitor from the aggregate in which he or she is competing at the time of the violation.

(vi) It is the intent of this rule change to allow the use of a tuner in all Group LV and HV, Score VFS, LV and HV hunter, Varmint Hunter rifles. This rule change does not affect the rules as they pertain to 1000 yd, and 600 yard competition/classes.

b) The use of muzzle brakes and/or venting or porting of barrels that redirects powder gas flow from following the direct line of the rifle bore shall not be allowed.
 

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