Bren L4 / .308 build

[Peter Laidler]

I would take the material from the FRONT of the barrel nut because the tightness of the barrel AND eventual CHS comes from the front face of the barrel nut bearing on its forward mating surface. The barrel nuts are VERY hard throughout. The buttress (?) thread of the barrel nut pulls the barrel back, tight, against the face pf the body.

We had facilities to bore out and re- bush worn barrel bearing faces where we couldn't get a barrel tight. Mind you, some Armourers with hand like shoulders of beef would tighten the barrels up like their lives depended on it. Not me........ Just a small hand pressure leverage on the nut and it'd click into place

Any eventual CHS problem will/can be adjusted with locking shoulders