Bren Mk 2 Recoil Spring Issues

[djandj]

djandj,

The original MkI's had a single spring. They were replaced with the double spring. Later replacement springs for both the MKI & MkII were the double spring. Sounds like you have a bad spring. They should never compress that much. Light strikes may indicate a weak striker spring if the semi is striker fired.

I have a MKII I converted to 54R. It uses a striker set up. Gas settings 3 / 4. I put a 1" plug behind the return spring (double spring) so that the return spring was in full compression at the end of the stroke. The length of spring compression in the semi with a striker is about 1" short of the full stroke due to the length of the striker.


The specs for the double spring are:

Inner 90 1/2 coil Left wire dia .036" OD .358" Free length 13.2/12.8

Outer 68 coils RT wire dia. .048" OD .477" Free length 13.2/12.8


You can buy them here:

50: SPRING, return, Mk 1 - BRP CORP Store

BREN recoil spring

Joe

Fantastic info here Joe. See I definitely think that I am missing a spring. Shouldn't the MK2 have one larger 3/4" recoil spring and then a small diameter spring right along the guide rod? I only have ONE spring back there. Where is the striker spring supposed to go? Cause I think I don't have one.

Can anyone post pics of their MK2 disassembled with the springs in place? I'm pretty sure I have only one spring back there.