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The GI Flash suppressor does not contribute to accuracy rather it is reamed or standard. The reamed suppressor has evidence to support accuracy improvement over the non reamed. I have not found this to be the case. The FS in question is a USGI type.

Any time something like this part is attached to the muzzle it works to limit accuracy, the Military saw it as a means to limit flash, but more to limit the muzzle movement, the directional gas flow helps hold the muzzle on target.

The M14 was more accurate without the FS, the report was too loud and the recoil was greater also, much greater in my experience.. ..

It is my position the reamed FS gave better accuracy not because it was reamed, but because the muzzle seat was machined to 90 degrees to match the barrel end. I have machined GI FS seats after testing the rifle for accuracy and this proves, in my case, to be true. Than I reamed the same FS and there was no accuracy improvement.

So what does this mean to the owner, you will have to decide that, but if you expect accuracy, try machining the seat, if a Commercial FS is your choice, do both jobs, than cross your fingers.
 

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The problem is that we are required to shoot the M14 with a flash suppressor installed under CMP and NRA rules (exceptions are made for restrictive states). Since this is the case I do recommend reaming the suppressor. I know it is debateable whether this modification has any real advantage, but since we are stuck with it, might as well.

Keep in mind that the military wasn't conserned with minute of angle accuracy in battle rifles, but they did ream the suppressors on the M21 sniper rifle and NM rifles. According to early testing by the Army, reaming did contribute to improved accuracy. Every small advantage helps.
 
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