M40A6 thumb cut

[Zigjib]

G'day;
does anyone have a photo of the newer type of thumb cut on the M40A6?
My understanding is that the older receivers still had the standard lug slots cut but the newer receivers just had a small notch removed from the rear of the ejection port?
Thanks
Carso

 

[USMCSGT0331]

G'day;
does anyone have a photo of the newer type of thumb cut on the M40A6?
My understanding is that the older receivers still had the standard lug slots cut but the newer receivers just had a small notch removed from the rear of the ejection port?
Thanks
Carso

Here you go, M40A6 "RR" prefix receiver:

 

[Zigjib]

MAGIC! thankyou

 

[USMCSGT0331]

 

[Ehtacs]

Is that to aid in single loading a cartridge? I've been compiling M40A6 details for a few years now and I've completely missed this one!