Bren 2 MS 7.62x39 muzzle thread pitch?

[reshp1]

I heard the first Bren 2S in 7.62x39 came with 1/2-28 UN muzzle threads (wtf?) but haven't heard what the 2 MS comes with. Anyone have one and tried to swap muzzle devices yet?

[cops312]

Should be the same as the 2s, 1/2-28 UN.

[GypsyDanger]

I heard the first Bren 2S in 7.62x39 came with 1/2-28 UN muzzle threads (wtf?) but haven't heard what the 2 MS comes with. Anyone have one and tried to swap muzzle devices yet?

They quietly changed the thread pitch on the 7.62 models to 5/8-24.

Source: I have an 11" 7.62x39

[88mustang]

Did your barrel have a bayonet lug

[Aries144]

Ah, that would help explain why the 14" barrels no longer have bayonet lugs.

[GypsyDanger]

Did your barrel have a bayonet lug

Nope.

[armoredman]

Per CZ-USA;

The S models don’t have a “standard” configuration (not a cataloged item), the barrel might be configured 14x1 with and without bayonet lugs, as well as ½ x 28 barrels and 5/8 x 24, neither of which will accept bayonet lugs)

 

The 7.62 x 39 Ms models should be coming with 5/8 x 24 threads and no bayonet lug. The first shipments had 1/2 x28 threads.

 

The firing pin spring is included on all 5.56 models.

No firing pin spring was included on the full auto 7.62 x39 guns to prevent light strikes, I’m not sure, but if I had to guess, it is likely the S models in 7.62x39 were sold without a firing pin spring like the select fire guns, but they then added the springs back in on the MS guns.

 

The extractor cut outs were something only needed on the 7.62 x 39. (the extractor extends past the bolt head on the 7.62 x 39 extractor necessitating the additional clearance, whereas the 5.56 extractor has always been below flush.)

[reshp1]

Bumping this, has anyone tried changing the muzzle device on their 7.62x39 MS yet? Doesn't look like there's much of a shoulder and the factory flash hider uses a jam nut? I want to attach a suppressor to the MD, so I'd rather avoid the jam nut if I can. Also, are the threads super long like on the original 805 PS1s that used a jam nut?

[Tsar]

Use a SCAR7 shoulder ring/washer

[Magsz]

Bumping this, has anyone tried changing the muzzle device on their 7.62x39 MS yet? Doesn't look like there's much of a shoulder and the factory flash hider uses a jam nut? I want to attach a suppressor to the MD, so I'd rather avoid the jam nut if I can. Also, are the threads super long like on the original 805 PS1s that used a jam nut?

I don't have a can on mine yet but I do have a dead air muzzle brake.  I use precision armament accu washers.  At first I was having issues with the muzzle device staying torqued against the washer since there is almost no shoulder.  Eventually, a combination of more torque and rocksett solved that problem.  I may look into using the aforementioned scar washer once my suppressor leaves the jail.