Threaded muzzle

In addition, the law banned all semiautomatic weapons that are equipped with a detachable magazine and two or more of the following bayonet lug, flash suppressor, protruding pistol grip, folding stock, or threaded muzzle. Magazines that hold more than 10 rounds are also prohibited. Weapons and magazines manufactured before September 13, 1994, however, are exempt. 

Two distinct procedures may be used. The preferred method is to use a large thread cutting lathe, or a lathe and V x28 EF (Extra Fine)Die to turn down and thread muzzle to specs given in fig.3. This will duplicate the Colt M-16/AR-15 and Armalite AR 18/AR 180 muzzle dimensions. The %x28 pattern will allow installation of the Sionics Suppressors and other accessories available for the above guns. Maximum allowable misalignment of threads to bore axis 1 so it may prove a wise move to farm out the job to a competent machin-ist/gunsmith. No need to mention the suppressor, you only want to mount an M-16 flash hider. 

The suppressor s muzzle retaining ring (part 6) must be modified for use with either of the two 9/16" threaded muzzles. Refer to Fig,5 for specs.Once modified, the ring is installed 1n the same manner as a regular 6 ring. Except for hand fitting a bushing to the barrel s OD, the suppressor/Mini 14 are now compatible. 

Muzzle Brake. (Freins de bouche in Fr, M lin-dungsbremse in Ger). A cylindrical device with flanged or baffled surfaces which is attached to the muzzle of a gun, usually by threads, to offset a long or complete recoil of the gun when fired. The expanding proplnt gases strike the baffles, thus pushing the gun barrel forward. This action can shorten the actual recoil distance, or it may relieve an overloaded recoil system. The latter would occur when a conventional gun was deliberately overloaded to increase the projectile velocity... 

Material is cold drawn seamless mechanical tubing or similar high quality seamless steel tube. Use an inside micrometer and an auto engine cylinder hone to enlarge and polish the bore to 2.38" +. 005". This is CRITICAL and is the most important operation of the entire project. Inside mikes and cylinder hones are available from local equipment rental shops. Cut the tube to length, square and deburr ends and crown the muzzle (.1875" half round). Thread 1.75" of the base end of the barrel w/2A TPI outside threads. Heat treat or case harden the finished barrel if possible. This will increase strength and reduce wear. Screw the barrel into the basecap (assembly A-B).Paint the outside of the completed assembly w/ olive drab enamel. 

Means for preventing, or tending to prevent, the formation of a partial vacuum at the muzzle of the barrel is provided within the exi)ansipn chamber 16 in the casing HO 14. This vacuum-prevention means is constituted by an expansion nozzle 62 formed or provided on the muzzle 20, for which purpo.se the latter is serew-threaded externally, and the. stem of the 116 nozzle is screw-threaded internally. Preferably the internal face 64 of the nozzle has the sha]>e shown in Figure 6, which shows a maximum diameter B, a minimum diameter [Pg.89]

Preferred Die-9/16x24 EF. Not generally available locally but may be ordered through a machine shop.Order the companion 9/16x24 Tap at the same time. The tap will be needed to thread the muzzle coupling later on. 

Part 6 - Muzzle Adapter Ring a. Material- 4130 steel, annealed OD- 1.110 .005 X. 5 long ID-. 4531 drill/ x 28 tap Counterbore rear-. 55 ID x. 15 long. This aids in starting threads when installing on rifle. 

Mortar Shells, Forging, 81mm. 26 Muzzle Threading.106... 

The simplest method is to drill the 4 rows of holes in the barrel and install a removable silencer mount on the muzzle. These mounts are male thread at the front. They are a-vailable for 25 from D.A.Q. Mounts for several other guns are also available. The bushings and aluminum tube work can be farmed out to a machine shop. 

The silencer is initially assembled by screwing the barrel coupling in place on the end of the pistol barrel replacing the original muzzle cap. The sleeve is then threaded into the other side of the barrel coupling until it butts up against the pistol barrel muzzle. It is then locked in place with a set screw as shown. 

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