"Oblique armament" on a KG 51 Me 262?

[Nick Beale]

Here's the text of CX/MSS/T472/49 which identifies the aircraft in question:

CX/MSS/T472/49 BT 5797
Report signed Hilmer, obltn. to KABUS (((Roman) I./KG)) IT. Stamped 1745/23/2:-
Strength return of 23/2
WL port Riedel starter does not function, position otherwise unchanged. Fw. Waldhof left on 23/2. Works No. 110605 with 15 degrees depression of oblique armament. Arrived on 23/2 from Lechfeld (B% request) instructions whether the a/c is to be (C% taken) over by (((Roman) I./KG)) or given up to KADIK (((Roman) II/KG))
NOTE: 1) Seen in file marked KG 51
2) Oblt. Hilmer has signed for the remaining elements of KG 51 at Giebelstadt. (cf. e.g. T469/22). For return of 21st see T470/27.

Then there was this:

CX/MSS/T498/52 BT 8237
((1)) Source saw a document dated 17/3, addressed to Detachment KABUS (( (Roman) I/KG)) 51, Giebelstadt, Oblt. Hilmer, dated 17/3, signed Ltn. Batel.
((2)) To KABUS (( (Roman) I/KG)) 51, Hopsten from Obpfr. Plattner, stamped 2345/19/3:
Strength return of 19/3: BB, HH, LL, ML, IL, AK, LK serviceable. GK, 110620, OL and 11199(smudge) shot up by a/c armament, 110605 with oblique armament shot up by a/c armament on 19/3 and completely destroyed. A/c was for KADIK (( (Roman) II/KG)).