Author Topic: CZ BREN 2MS semi-auto disconnector issues  (Read 214 times)

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Offline CanadianJames

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CZ BREN 2MS semi-auto disconnector issues
« on: April 02, 2024, 10:54:36 PM »
Hi, I recently purchased a CZ BREN 2MS rifle secondhand and I'm having issues with the semi-auto disconnector. At first the rifle ran beautifully but after about ~175 rounds the trigger would go dead after firing a shot. The hammer would hang on the disconnector and would not release onto the sear when the trigger was released. A slight bump to the receiver is all that is required to get the disconnector to "slip" off the hammer and allow it to reset onto the sear. Upon returning home I field stripped the rifle and inspected the mechanism in depth. I believe the cause of the hangup is a very shallow "Shelf" worn into the hammer on the very edge of the contact patch with the disconnector. As seen in the images the disconnector is engaged with this shelf and not allowing the hammer to reset onto the sear. This rifle was purchased with an aftermarket HB Industries trigger installed and a 18.6" barrel conversion done by Dlask Arms Corporation for Canadian firearms regulation reasons so perhaps these are contributing factors. Has anybody else had a similar issue? Does my hammer wear look normal for 200 rounds? Thanks in advance!






Online MeatAxe

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Re: CZ BREN 2MS semi-auto disconnector issues
« Reply #1 on: April 03, 2024, 01:38:18 AM »
Hi, I recently purchased a CZ BREN 2MS rifle secondhand and I'm having issues with the semi-auto disconnector. At first the rifle ran beautifully but after about ~175 rounds the trigger would go dead after firing a shot. The hammer would hang on the disconnector and would not release onto the sear when the trigger was released. A slight bump to the receiver is all that is required to get the disconnector to "slip" off the hammer and allow it to reset onto the sear. Upon returning home I field stripped the rifle and inspected the mechanism in depth. I believe the cause of the hangup is a very shallow "Shelf" worn into the hammer on the very edge of the contact patch with the disconnector. As seen in the images the disconnector is engaged with this shelf and not allowing the hammer to reset onto the sear. This rifle was purchased with an aftermarket HB Industries trigger installed and a 18.6" barrel conversion done by Dlask Arms Corporation for Canadian firearms regulation reasons so perhaps these are contributing factors. Has anybody else had a similar issue? Does my hammer wear look normal for 200 rounds? Thanks in advance!







That seems like a lot of wear for only 200 rounds. Mine has at least a couple thousand 7.62x39 rounds through it and has very little wear on the trigger group compared to yours.

Not sure why you’d have an HBI disconnector in yours, since Canada wouldn’t have to comply with US Sec. 922(r) which mandates that a rifle have a certain number of US parts to be importable here. The stock CZ trigger group is actually pretty nice. Not sure why the previous owner put in a HBI disconnector unless he wore out the original.

Yeah, I would suspect the HBI disconnector is bad, and that the rifle has much more than 200 rounds through it. Hopefully, you have better luck getting OEM spare parts than we do here from CZ USA.


« Last Edit: April 03, 2024, 01:44:04 AM by MeatAxe »

Offline Wobbly

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Re: CZ BREN 2MS semi-auto disconnector issues
« Reply #2 on: April 03, 2024, 07:48:27 AM »
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