Armourers Sectioned /Cutaway/ Skeletonised Brengun

[Topfmine]

The Sectioned Brens I have seen on Google have all the sectioning done on one side ( looking down the gun the left side rather than the right shown here) the magazine's seem to have circular cuts rather than square cuts. Seems to be a bit of confliction to what is correct. Have to get hold of the sectioning drawings.

[Peter Laidler]

There was a little miscellaneous instruction (Misc Inst 7) in the 70's/80's to the effect that the side of the tripping lever 'window' or opening in the sear could be removed in order to show the top (R) and bottom (A) claws of the tripping lever acting when the change lever is rotated. Also, a scction to be removed from the barel nut to show the hold on the barrel thread through the otherwise redundant opening in the right side when the barrel nut is closed down.

[Brit plumber]

The genuine SKN guns are sectioned down the right side of the guns with some small sectioning on the left of the butt and as Peter has said, the barrel nut.

Any other type aren't original SKNs but may be Aussie or dealer done. When I get back from the states I can take photos of the 3 I have for comparison. For info, these are some of the genuine SKNs I know are in the UK

SKN338
SKN487
SKN1251
SKN1761
SKN2442 Mine
SKN4438
SKN4510 Mine
SKN4666
SKN4671
SKN4977 Mine
SKN5404
SKN5532

[Peter Laidler]

Just a small observation but some/most of the dealer done skeletonised Brens don't usually (?) show the side elevation of the locking shoulder where the top rear of the breech block locks into place

[Brit plumber]

Is this the section Peter?

Attachment 57066

[Peter Laidler]

Yep, that's it. An important part of its function. That and the mechanical safety of the piston post between the actual LOCK and firing. Then firing, commencement of gas acting on the piston. Piston starts to move, bullet leaves the bore, gas pressure immediately drops to atmospheric. Remaining inertia imparted onto heavy piston assembly (not breech block yet don't forget.....) moves it rearwards for a further 3/4" or so and only then does it commence to unlock the breech. Primary extraction, full unlocking etc etc.

It's a great gun to skeletonise to illustrate mechanical safety and all that it entails.

The 1" x .75" hole ahead of the breech block shows the locked down barrel nut. Misc Inst 7 (or 8?) states that the barrel nut can be slotted here to illuistrate the square thread locking the barrel and drawing it rearwards.

Fantastic bit of kit.

When we discussed the 'is it or isn't it' dilemma with the Milspec SKN Brens and L54/55 DP's, it was suggested that to clear any ambiguity, it would be wise to weld over the firing pin retaining pin so that the full length firing pin remains fixed to the inert gun. Just thought I'd mention that!

I seem to recall seeing a couple with another narrow slot/window above the main body slot to show the pick-up of the next round in the magazine by the feed horns. But perhaps the ones used by Armourers-in-training had extra openings for their training needs.

Thanks BP.