sub caliber insert

[Vlim]

Here's a scan from the 1936 RWS catalog.

Note the little loading spoon and the construction of the ring.

The RWS barrels were actually numbered to identify the pistol type they belonged to.

Number 15 was the 9mm version, 100mm barrel length and 160mm insert barrel length.

Other numbers were:
Number, calibre, original barrel length, insert barrel length.
14, .30 luger, 95mm, 135mm.
6, .30 luger, 120mm, 160mm.
29, .30 luger, 145mm, 185mm.
31, .30 luger, 200mm, 240mm.
15, 9x19, 100mm, 160mm.
36, 9x19, 120mm, 180mm
27, 9x19, 150mm, 200mm.
16, 202mm, 240mm.