R1 and L1A1 flash hiders interchangeable?

[scoobsean]

Are the flash hiders from the L1A1 able to fit on the Metric R1? I have a SA barrel on a 7.62 LMG that has a R1 flash hider that would look more like an L4 if it had a L1A1 hider

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[Paul S.]

Metric threads versus British Standard ...

[nzl1a1collector]

Not only that, the 'Inch' Flash Eliminator requires a slot to be cut into the barrel so the Key can be fitted and then retained by a Pin.

Not even sure you will be able to screw the F/E onto the barrel, I would suspect the the diameter of the barrel would be greater than a L1A1 barrel.

[Peter Laidler]

As a bit of an aside, if you wanted to simplify things regarding the f/e key and pin/slotted barrel, you could screw the f/e on using a suitable hot-break lok-tite - as we did on the L85/6 rifle and LSW.

[browningautorifle]

It also can be done if you have enough tools and are willing to make all the adjustments. Just measure it up and see?

[Peter Laidler]

Did anyone ever establish exactly what thread the L1A1 rifle has on the muzzle. I suspect that it'll be a metric pitch over a diameter.

[mrclark303]

Morning Peter, I think (need to check to be sure though) my mate fitted an L1A1 5 slot FE onto his Imbel Fal a few years back, so it would suggest a metric pitch for the L1A1 muzzle thread.

[nzl1a1collector]

The threads on an L1A1 Barrel for the Flash Eliminator are 9/16X24 RH thread.

[browningautorifle]

We should have thought about asking you straightaway...

[frenchkat]

Metric FALs are left hand threads, while Inch are right hand thread. Both 9/16ths X 24.

I put an Inch 5 slot on my Metric para. Required me to cut the old threads off, re-thread for right hand threads and cut the key way.

I've heard of guys just cutting the new threads right over the old ones.

Check with DSA, I think they carry look-a-like flash hiders with the opposite threads.