Gunsmithing FN Herstal TSR receiver threads

[Ritten]

Does anyone know what pitch the threads are on an FN Tactical Sport Rifle are? I've got a short barrel I'm threading for a can and need to make an extension for the tennon so I can run it through the headstock. It appears to be much finer than 16tpi and the ID of the receiver is 1.032" so I know it's not the 1x16tpi that the FN SPR is. I saw somewhere that it's the same as a pre '64 model 70, but I thought that was 1x16" as well.

I don't have a pitch gauge, but it's now on order.

 

[Ritten]

Re: FN Herstal TSR receiver threads

Nevermind. Found it. 1 1/16x28tpi

 

[bignada]

Re: FN Herstal TSR receiver threads

pretty sure it is a 1 in 18 thread pitch, not 28

 

[Ritten]

Re: FN Herstal TSR receiver threads

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bignada</div><div class="ubbcode-body">pretty sure it is a 1 in 18 thread pitch, not 28 </div></div>

Then the one I had was cut wrong, cause the 1 1/16x28 female extension I made to screw the barrel into so I could run it through my headstock screwed on perfectly.