[BR99 10 round mags]

Prepare to be disappointed then!

 

Out of interest whats stopping them getting over there? They've been available in the UK for a few months now and AFAIK there are no export restrictions from the UK for this sort of item

[BR99 10 round mags]

If you are planning on using them in a MKA1919 have you actually tried a BR99 mag in your gun yet? As i was at a shoot a fortnight ago and i did a test with my BR99 mags and they would not fit at all in the other guys MKA1919, where as his mags fitted in my gun perfectly.

 

If you haven't i'd suggesting trying one first, and make sure its a 10rd version as they're tighter than the 5rd mags

[Wear inside upper receiver?]

Thanks for the clarification

[Wear inside upper receiver?]

My BR99 has the same wear on it. Is it not the back of the bolt that does the damage to the upper as its worn on my bolt and seems to be the same in the OP's picture?