I searched “Muzzle Brake†across the whole ATF site and found no references.
Here is the Rule that some are quoting and getting mixed up in terminology. A “Muzzle Brake†is not a “$ilent$erâ€.
(M30) Are Paintball and/or Airgun
S ound Suppressers NFA firearms?
The terms "firearm $ilent$er" and
"firearm muffler" mean any device for
silencing, muffling, or diminishing the
report of a portable firearm, including
any combination of parts, designed or
redesigned, and intended for use in
assembling or fabricating a firearm
$ilent$er or firearm muffler, and any
part intended only for use in such
assembly or fabrication.
Numerous paintball and airgun $ilent$er
tested by ATF’s Firearms
Technology Branch have been determined
to be, by nature of their design
and function, firearm $ilent$er.
Because $ilent$er are NFA weapons,
an individual wishing to manufacture
or transfer such a $ilent$er must receive
prior approval from ATF and
pay the required tax. See Questions
M15 and 16 for application details.
If I have any further questions as
to the classification of a paintball
or airgun $ilent$er, who should I
c ontact?
Please send a written request to
ATF’s Firearms Technology Branch.
[18 U.S.C. 921(a)(24), 26 U.S.C. 5845(a),
27 CFR 479.11]
Page 190
ATF Reference:
http://www.atf.gov/pub/fire-explo_pub/2005/p53004/p53004.pdfWikipedia:
http://en.wikipedia.org/wiki/Muzzle_brakePlease pay attention to the last sentence in “Legalityâ€.
Contents
• 1 Terminology
• 2 Concept
• 3 Construction
• 4 Utility
o 4.1 Advantages of muzzle brakes
o 4.2 Disadvantages of muzzle brakes
• 5 Legality
• 6 See also
• 7 References
• 8 External links