Actually, the v-Munition (spelled verbessert) generated more recoil than the standard MG 17 could handle, so a specially modified version of the gun was developed, which would then not work with ordinary ammo. Barrel life was reduced to 2,000 rounds, as the high-pressure loadings were much more erosive.However a special ammo was creted for aerials weapons, that was the Vervesserte (improved) cartrigdes o "V" patronen.
The V cartrigdes were provided with 15 % more powder charge, that aumented the muzzle speed well over 800 m/s shortening the flight time to target. The increased pressure also help to move the heavier recoil spring used in aeronautical weapons compared with ground MGs.
Actually, the v-Munition (spelled verbessert) generated more recoil than the standard MG 17 could handle, so a specially modified version of the gun was developed, which would then not work with ordinary ammo.
MG-131, part 2, use in fighter aircrafts:
The Bf-109 and Fw-190 emplacementes of this gun were both designed to shoot trought the airscrew, because that a synchronization device was needed.
In this form the gun was pneumatically trigered...
An experimental variant equipped with electrical primer was developed but did not enter in service.
Some excellent pics Bronson...
This is not correct. A percussion-primed version of the MG 131 was developed but never used by the Luftwaffe - all of their MG 131 were electric primed. This was done to facilitate synchronisation: the guns were not pneumatically triggered, they were fired by an electrical signal received from the synchronisation system.