Ok, on a 20" AR, how is accuracy affected by....brakes, suppressors, compensators etc. etc.
would a plain muzzle be better ?
Your thoughts please
SPECTRE

  I don't know either, and I'm looking forward to the replies.   And maybe someone can explain why muzzle brakes are not allowed in CMP competition.

I'll add to this...Do muzzlebreaks have to be pinned permanently on a postban and how much damage is done to the muzzle doing this?

Quoted: I'll add to this...Do muzzlebreaks have to be pinned permanently on a postban and how much damage is done to the muzzle doing this?

If the barrel is threaded, then yes, they do have to be permanently attached to a postban.  They can be blind pinned, or welded, or hitemp soldered, or?

If the brake is a pin on or a set screw type, then no... since the barrel is not threaded to accept this.

Damage?  Shouldn't be ANY damage... unless some yahoo drunk smith does it...  

IMO, and I believe that I've read this somewhere, A brake or suppresser of any kind will affect accuracy to a certain degree. This is because the gasses a not directed evenly.

If you are shooting a competition which requires minute accuracy then use a plain muzzle. If you are shooting a high speed comp then by all means use a muzzlebrake for a faster follow-up.

Sig, aren't CMP competitions for military appearance firearms? You can alter any internal part as long as it doesn't affect the overall appearance.

Actually, some compensators are designed to help accuracy.  I have a Volquartzen barrel on my 10/22 that has a special compensator on it to disperse the gases in a way that they do not have a random affect on the bullet.  Of course, this is not a recoil compensator... it is simply to assists the gases in combination with a target crown.

Quoted: IMO, and I believe that I've read this somewhere, A brake or suppresser of any kind will affect accuracy to a certain degree. This is because the gasses a not directed evenly. If you are shooting a competition which requires minute accuracy then use a plain muzzle. If you are shooting a high speed comp then by all means use a muzzlebrake for a faster follow-up. Sig, aren't CMP competitions for military appearance firearms? You can alter any internal part as long as it doesn't affect the overall appearance.