Thread adapter vs New Threads

rawdeal77

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Minuteman
Jul 11, 2011
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Dallas & Lubbock, Tx
I've faced this decision once before and went with the latter but before I do it again I want to get some feed back.

This question arises out the following circumstances. I intend to install an AAC supressor on a 6.5 Grendel barrel, which will require a proprietary muzzle break from AAC (I have no use for a flash hider). As you may know, the standard muzzle thread for 6.5 cal is 9/16-24 (I think), which is different from both .308 and .223 standard muzzle threads.

The only available thread pattern for the AAC muzzle break is 5/8-24 (.308 size). So my options are:

1) install an adaptor on the existing threads; or

2) shave off a 1/4" of the barrel and re-thread.

My questions are:

1) Does using a thread adapter effect riffle or suppressor perormance, or accuracy?

2) What are the pros and cons of using a thread adapter over re-threading?

In answering, know that the cost difference in the two options is not an issue. Also, the barrel is already 24", so cutting off the 1/4 to re-thread isn't going to pose any problems.