Changing Mk1 buttstock for Mk4

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Originally Posted by Peter Laidler

Is that a complete new section of body? I'm looking at the distinct vertical ridge down from the mag catch axis pin. The original INGLIS/date would be on a surface level with the BREN Mk2 marking

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Quite possibly. These receivers come into the USA butchered into 4 pieces with diagonal cuts through all the vital parts. The rebuild guys weld up the gaps and might have to use multiple kits or make new areas too. I admire the time and skill involved. I bought this gun via auction, so don't know the history of the rebuild.

The gun being discussed is a typical Historic Arms build... He uses gusset plates and weld to reinforce the mag well walls when reassembling the cut receiver... which makes for a readily identifiable new profile for outer surface of the receiver walls... the split in the slide in front of the trigger guard is also a tell for a HA build. And as Vincent has pointed out in previous posts and is again pictured here... the left side locating key is mostly milled away on the gas piston/bolt carrier. The faux riveted on mag lip support is cosmetic and is not an actual modification part... and like the re-lettering has been applied to give a look a like effect for this build. FYI... I have two made this way... but I had the SA flash hider replaced with one from a MAG58 and it does a good bit to make the whole effect much more like an original conversion's barrel - but I did not pay to have the .303 barrel profile turned down to the .308 outer dimensions.

Really this would have been better being marked as an L4A3 rather than an L4A4!

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Originally Posted by WallyG.

The gun being discussed is a typical Historic Arms build... He uses gusset plates and weld to reinforce the mag well walls when reassembling the cut receiver... which makes for a readily identifiable new profile for outer surface of the receiver walls... the split in the slide in front of the trigger guard is also a tell for a HA build. And as Vincent has pointed out in previous posts and is again pictured here... the left side locating key is mostly milled away on the gas piston/bolt carrier. The faux riveted on mag lip support is cosmetic and is not an actual modification part... and like the re-lettering has been applied to give a look a like effect for this build. FYI... I have two made this way... but I had the SA flash hider replaced with one from a MAG58 and it does a good bit to make the whole effect much more like an original conversion's barrel - but I did not pay to have the .303 barrel profile turned down to the .308 outer dimensions.

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How difficult was it to replace the flash hider with the MAG 58 one?

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Originally Posted by scoobsean

How difficult was it to replace the flash hider with the MAG 58 one?

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Thread Pitch - Anyone know????

From that earmarked thread and my experience I;d say it was 60 degree metric over a diameter. Get a bit of wood and screw it into the hole to establish the pitch and then turn said pitch and angle onto a bit of slave alloy until you get it right. Then start cutting for real. Done it a zillion times..........

Well, I fitted the new buttstock and mk1 bipod. Everything seems to work okay when dry firing. I'll probably not mess with the flash hider, as I don't have any metal working tools.
I just need to get a mk2 carry handle and plate, but I am okay with the mk1 handle for now.
I can take some photos and post them if anyone is interested

This is what my Historic Arms "L4" Bren looks like now I have changed the bipod and buttstock. Thanks to you all for the information and advice so far!
Attachment 64678Attachment 64679

It looks very nice. :thup: :thup:

Thanks Vincent.