ADJUSTABLE TUNING DEVICE
An adjustable tuning device has a cup having a base defining an aperture configured to closely receive a limited rear portion of the muzzle portion such that a forward portion of the muzzle portion extends forward of the base, the cup having a rear surface configured to abut the forward-facing shoulder of a barrel, the cup being externally threaded, and a weight having internal threads configured to mate with the externally threaded cup and operable to move in a range of axial positions with respect to the cup. The cup may have a skirt extending rearwardly of the base. The weight may taper to a reduced diameter at a rear end. The cup may have an external diameter at an externally threaded portion, and the weight may have a rear portion having an internal diameter less than the external diameter of the cup.
1 . An adjustable tuning device for a firearm having a barrel with an muzzle portion, a forward-facing shoulder rearward of the muzzle portion, and a forward barrel portion rearward of the forward-facing shoulder and having an exterior profile, the device comprising:
a cup having a base defining an aperture configured to closely receive a limited rear portion of the muzzle portion such that a forward portion of the muzzle portion extends forward of the base;
the cup having a rear surface configured to abut the forward-facing shoulder;
the cup being externally threaded; and
a weight having internal threads configured to mate with the externally threaded cup and operable to move in a range of axial positions with respect to the cup.
2 . The adjustable tuning device for a firearm of claim 1 wherein the cup has a skirt extending rearwardly of the base.
3 . The adjustable tuning device for a firearm of claim 1 wherein the weight tapers to a reduced diameter at a rear end.
4 . The adjustable tuning device for a firearm of claim 1 wherein the cup has an external diameter at an externally threaded portion, and wherein the weight has a rear portion having an internal diameter less than the external diameter of the cup.
5 . The adjustable tuning device for a firearm of claim 1 wherein the muzzle portion of the barrel is threaded, and the cup aperture is threaded to mate with the muzzle portion.
6 . The adjustable tuning device for a firearm of claim 5 wherein the cup base has a limited thickness less than half a length of the threaded muzzle portion such that a major portion of the muzzle portion is exposed to receive and connect to a selected muzzle device.
7 . The adjustable tuning device for a firearm of claim 1 including a separate muzzle device configured for attachment to the forward portion of the muzzle portion while the cup is attached.
8 . The adjustable tuning device for a firearm of claim 7 wherein the base of the cup is compressively captured between the muzzle device and the forward-facing shoulder.
9 . The adjustable tuning device for a firearm of claim 1 wherein the cup base has a limited thickness less than a length of the muzzle portion such that a portion of the muzzle portion is exposed to receive and connect to a selected muzzle device.
10 . The adjustable tuning device for a firearm of claim 1 wherein the cup base has a forward-facing surface configured to be abutted by a muzzle device connected to the forward portion of the muzzle portion.
11 . The adjustable tuning device for a firearm of claim 1 wherein the cup base has a thickness of less than ¼ inch.
12 . The adjustable tuning device for a firearm of claim 1 wherein the cup base has a thickness of less than the diameter of the aperture.
13 . An adjustable tuning device for a firearm having a barrel with a threaded muzzle portion, a forward-facing shoulder rearward of the muzzle portion, and a forward barrel portion rearward of the forward-facing shoulder and having an exterior profile, the device comprising:
a cup having a base defining a threaded central aperture configured to mate with the threaded muzzle portion;
the base having a rear surface configured to abut the forward-facing shoulder of the barrel;
a skirt extending rearwardly from the base and defining an internal space with a diameter greater than the exterior profile of the barrel;
the skirt being externally threaded;
a weight having internal threads configured to mate with the externally threaded cup and operable to move in a range of axial positions with respect to the cup;
the weight having an open front end configured to enable attachment of a muzzle device forward of the cup base to the threaded muzzle portion of the barrel; and
the cup base having a limited thickness of less than the diameter of the aperture.
14 . A firearm comprising:
a barrel with a threaded muzzle portion, a forward-facing shoulder rearward of the muzzle portion, and a forward barrel portion rearward of the shoulder and having an exterior profile;
a cup having a base defining an aperture configured to closely receive a limited rear portion of the muzzle portion such that a forward portion of the muzzle portion extends forward of the base;
the cup having a rear surface configured to abut the shoulder;
the cup being externally threaded;
a weight having internal threads configured to mate with the externally threaded cup and operable to move in a range of axial positions with respect to the cup; and
a muzzle device threadedly connected to the forward portion of the muzzle portion with the base of the cup captured compressively between the muzzle device and the forward-facing shoulder.
15 . The firearm of claim 14 wherein the cup has a skirt extending rearwardly of the base.
16 . The firearm of claim 14 wherein the weight tapers to a reduced diameter at a rear end.
17 . The firearm of claim 14 wherein the cup has an external diameter at an externally threaded portion, and where the weight has a rear portion having an internal diameter less than the external diameter of the cup.
18 . The firearm of claim 14 wherein the cup base has a limited thickness less than half a length of the threaded muzzle portion such that a major portion of the muzzle portion is exposed to receive and connect to a selected muzzle device.
19 . The firearm of claim 14 wherein the cup base has a thickness of less than ¼ inch.
20 . The firearm of claim 14 wherein the cup base has a thickness of less than the diameter of the aperture.