Post War P-51s - Use of M3 .50 Cal Machine Gun

[ronl]

Does anyone know if post war P-51 Mustangs made use of the Browning M3 .50 Cal machine gun? The M3 .50 cal version had a recoil booster on the end of the barrel, giving the barrel a tapered look. It also extended the length of the gun by about an inch, so the barrels stuck out a bit further from the inboard and outboard locations in the wings. I have seen a few pictures of US ANG and RCAF aircraft that seem to show longer barrels and was wondering if these might be the M3 guns.

I don't believe the M3 .50 cal was used during the war, but I could be wrong.

Thanks.

Ron