9x19 in 7,63x25 chamber

[alvin]

On Westinger Schnellfeuer (I have not gotten a chance to look at Nickl), the firing control switch does two things: it controls the width of the trigger and the position of the 2nd sear (full-auto sear).

In full auto mode, the width of trigger top is extended to raise the disconnector all the time as long as the trigger is kept pushing down, regardless the bolt position, so the 1st sear (semi-auto sear) does not lock the hammer anymore while the trigger is kept pushing down.

Also in full auto mode, the 2nd sear bar is enabled. The lower tip of the 2nd sear locks the hammer, and it releases the hammer when barrel extension touches its upper tip, just before the barrel extension fully returns to its forward position.

So, on Schnell full-auto mode, the hammer won't fall while the bolt is open wide even if the trigger is kept pushing down, because the hammer is locked by the 2nd sear. But the hammer will be released when the bolt and barrel extension almost returns to battery.

May I assume Royal has only one sear? If that's true, its full-auto mode was implemented more like "slam-fire".....

[Steinar]

Originally Posted by alvin

May I assume Royal has only one sear? If that's true, its full-auto mode was implemented more like "slam-fire".....

The mechanical design is packed down into the frame, it's a hassle to dissemble it.. So I'm not really sure if it has one or two sears. But the hammer does not release until the bolt is completely back into the forward position. First time hammer will fall by trigger pull, is not related to the bolts position on this broom look alike

[alvin]

Originally Posted by Morgan Kane

But the hammer does not release until the bolt is completely back into the forward position. First time hammer will fall by trigger pull, is not related to the bolts position on this broom look alike

It's supposed to be two-sear design then. The behavior matches Schnellfeuer perfectly. When the hammer is cocked by finger, it is locked by the 1st sear. Pull out the bolt, the trigger is not disconnected from the trigger in the full-auto mode (vs in semi-auto mode, the trigger is disconnected), so push the trigger will release the hammer, even if the bolt is open.

Please note, the hammer is locked by the 1st sear in the first time cocking. Why the 2nd sear does not get involved in this step? It's because the barrel extension is in full forward position, so the 2nd sear is in 'release' position. Keeping trigger pushed down, the 1st sear is effectively disabled, the 2nd sear controls the releasing of the hammer in the following firing, until the trigger is released to re-enable the 1st sear, or the gun runs out of the ammo, bolt is hold open wide by the magazine follower.

Regarding "fixing" the minor dimple on the barrel extension.... It's not broken, better leave it alone. "No change in my hands". Just IMO.