Building the Canadian Semi-Auto STEN

[Claven2]

Here, a SAS3 bolt (extreme left) is compared with two newly shop-made experimental (machined to be semi-auto only) open-bolt STEN bolts, one patterned after a Sten bolt using basic dimensions available on line (middle), the other reconfigured for a bottom feed MP3008 style (far right). Note that the sear engagement surfaces extend all the way across the bolts, for semi auto only function (ie, no matter what position the selector is in, the interruptor would be tripped). It is unknown if either of these open bolts actually function, there being no real Sten or MP3008 in my posession which to test them, but from an engineering standpoint, they would run just fine.

If an open-bolt gun is approved, machining semi-only open bolts looks to be no big deal. The SAS bolt is a more difficult endeavor, but may still be doable in the advanced home shop.



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